Yaw Wang CHAI

@titech.ac.jp

School of Materials and Chemical Technology
Tokyo Institute of Technology

Yaw Wang CHAI


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https://researchid.co/ywchai
> Highly caliber MATERIALS SCIENTIST with a good metallurgical research background.
> Experienced in phase transformations, interfacial defects, microstructure, and crystallographic characterization in a
range of structural and functional materials;
- shape memory alloys: Ti-Nb & CuZnAl,
- thermoelectric materials: half-Heusler, -FeSi2, Mg2(Si, Sn)
- heat resistant materials: High-Cr ferritic stainless steels, Co3AlC and Ni3Al, Ti alloys
> Skilled in a wide range of microstructure and properties characterization techniques: SEM, EPMA, TEM, HRTEM, STEM-
EDS, STEM-HAADF, in-situ heating TEM, twin-jets electropolishing, focus ion beam, ion-milling, XRD, DTA, DSC, laser flash,
ZEM-3.
> Good communication and presentation skills, team player, practical approach to problem-solving, self-motivated,
positive thinker, inquisitive, and working independently.

EDUCATION

The University of Liverpool, United Kingdom

RESEARCH INTERESTS

Phase transformations in solid materials, interfacial structure analyses & crystallography, thermoelectric materials, shape memory alloys
33

Scopus Publications

1086

Scholar Citations

16

Scholar h-index

19

Scholar i10-index

Scopus Publications

  • Compositional Gradient Layered Microstructure Control for Reducing Lattice Thermal Conductivity of Mg2(Si,Sn) Thermoelectric Alloys
    Feifan Zhang, Yaw Wang Chai, Yixun Wang, Yonghoon Lee, Yoshisato Kimura
    Materials Transactions, 2026
    In Mg2(Si,Sn)-based alloys, compositional gradient layered microstructure (CGLM) has been reported as an effective factor in enhancing thermoelectric performance, primarily due to reduced lattice thermal conductivity. However, it is quite difficult to control CGLM, since Mg loss via evaporation and oxidation during the melting and solidification processes tends to gradually shift the composition of the liquid phase away from the nominal composition of Mg2(Si,Sn) toward the Mg-poor side of the phase diagram. This leads to the formation of Si and Sn phases as the final products of non-equilibrium solidification. Hence, compensation for Mg loss is necessary to facilitate solidification being completed within the Mg2Si–Mg2Sn pseudo-binary system under a proper condition of solidification. Consequently, an alloy consisting almost entirely of CGLM (hereafter denoted as Full CGLM), achieved by 10 at% excess Mg compensation in this work, comprises six layers, starting from the primary solidification of Mg2Si phase as a core part and extending to the outer shell layer of Mg2Sn phase formed via solidification after the peritectic reaction. The core of the primary phase is considered to be a single crystal grain, while each surrounding layer of CGLM is composed of Mg2(Si,Sn) polycrystalline solid solutions exhibiting widely varied Si/Sn ratios following the solidus line of the Mg2Si–Mg2Sn phase diagram. When the solidification route, presented by a monovariant line on the liquidus surface projection of the Mg–Si–Sn ternary phase diagram, deviates from the pseudo-binary edge toward the Mg-rich side, corresponding to overcompensation for Mg loss, solidification terminates with the formation of eutectic Mg and Mg2Sn phases as the final products. The single colony size of CGLM decreases as the cooling rate of solidification becomes higher, since the nucleation of the core Mg2Si is enhanced. Ultimately, the Full CGLM alloy exhibits a significantly low lattice thermal conductivity of 1.22 W m−1 K−1 at 573 K, which is attributed not only to the solid solution effect of Mg2(Si,Sn) phases with a large volume fraction of CGLM but also to a larger interfacial area with a high density of misfit dislocations induced by the large differences in lattice parameters between Mg2(Si,Sn) grains according to the widely spread Si/Sn ratios.
  • Phase Stability and Thermal Expansion Properties of Additive Manufactured Super Invar Alloy
    Senlin Cai, Ryota Nagashima, Yaw Wang Chai, Naoki Sakaguchi, Nobuo Nakada
    Tetsu to Hagane Journal of the Iron and Steel Institute of Japan, 2025
    Super invar alloy, Fe–32%Ni–5%Co, is widely utilized in precision instruments due to its remarkably low thermal expansion coefficient. Additive manufacturing holds promise for fabricating complex-shaped components with this alloy. This study investigated the phase stability and thermal expansion properties of super invar alloy fabricated via Laser Powder Bed Fusion (AM sample), comparing them to those of conventionally cast material (Re-melt sample). Microstructural analysis indicates that the AM sample has a more stable austenitic structure, attributed to minimal micro-segregation. Furthermore, it was observed that the thermal expansion coefficient decreases consistently with higher cooling rates within the temperature range of 400-300 K. As a result, AM sample exhibits lower expansion coefficient and it maintains at lower temperatures.
  • Phase Stability and Thermal Expansion Properties of Additive Manufactured Super-invar Alloy
    Senlin Cai, Ryota Nagashima, Yaw Wang Chai, Naoki Sakaguchi, Nobuo Nakada
    ISIJ International, 2025
    Super-invar alloy, Fe–32%Ni–5%Co, is widely utilized in precision instruments due to its remarkably low thermal expansion coefficient. Additive manufacturing holds promise for fabricating complex-shaped components with this alloy. This study investigated the phase stability and thermal expansion properties of Super-invar alloy fabricated via Laser Powder Bed Fusion (AM sample), comparing them to those of conventionally cast material (Re-melt sample). Microstructural analysis indicates that the AM sample has a more stable austenitic structure, attributed to minimal micro-segregation. Furthermore, it was observed that the thermal expansion coefficient decreases consistently with higher cooling rates within the temperature range of 400-300 K. As a result, AM sample exhibits lower expansion coefficient and it maintains at lower temperatures.
  • Interdiffusion of Solute Elements in the α-Fe Phase of the Fe–Cr–Mo and Fe–Cr–Si Ternary Systems
    Dosung Lee, Mariko Tsuyuguchi, Manabu Watanabe, Yaw Wang Chai, Takako Yamashita, Shin Ishikawa, Yoshisato Kimura
    ISIJ International, 2024
    To understand the interdiffusion of alloying elements in the α-Fe phase of the Fe–Cr–Mo and Fe–Cr–Si ternary systems, interdiffusion coefficients are determined. The main (D͂Feii and D͂Fejj, 𝑖: Cr and 𝑗: Mo or Si in the present study) and cross (D͂Feij and D͂Feji) interdiffusion coefficients in the ternary systems were determined by the Whittle–Green method. From main interdiffusion coefficients in the ternary systems at 1073 K, the average value of D͂FeMoMo was approximately 1.5 times higher than that of D͂FeCrCr in the Fe–Cr–Mo system, while the average value of D͂FeSiSi was 1.8 times higher than that of D͂FeCrCr in the Fe–Cr–Si system. From the D͂FeCrCr values of the ternary systems, Si has an accelerating effect than Mo on Cr diffusion in the α-Fe phase. Increasing the ratio of the Mo to Cr concentration has a suppressing effect on the respective Cr and Mo interdiffusion flux within the α-Fe phase. Increasing the concentration ratio of Mo to Cr suppresses the effect of Mo and Cr on the respective Cr and Mo interdiffusion fluxes within the α-Fe phase. Considering the temperature dependence, the Mo diffusivity is more sensitive than the Cr diffusivity. The cross interdiffusion coefficients, D͂FeCrMo and D͂FeMoCr, are positive and the values are insignificantly different in the Fe–Cr–Mo system, while D͂FeSiCr and D͂FeCrSi were negative. This study is beneficial to understand microstructure evolution in ferritic stainless steels at high temperatures.
  • Intermetallic phase precipitation and oxidation behavior of Fe–20Cr–0.5Nb–2Mo (at%) high-Cr ferritic alloy at high temperatures
    Shintaro Kondo, Yaw Wang Chai, Kentaro Kanai, Lee Dosung, Manabu Watanabe, Shin Ishikawa, Takako Yamasita, Yoshisato Kimura
    Acta Materialia, 2023
  • Effect of Mo addition on laves phase precipitation behavior in Fe-20%Cr-x%Nb alloys
    Shin Ishikawa, Takako Yamashita, Tomohito Kiryu, Yaw Wang Chai, Yoshisato Kimura
    Materials Characterization, 2022
  • Effect of Half-Heusler Interfacial Structure on Thermal Transport Properties of (Ti, Zr)NiSn Alloys
    Mizuki Sato, Yaw Wang Chai, Yoshisato Kimura
    ACS Applied Materials and Interfaces, 2021
    The microstructure of the half-Heusler phase separation in half-Heusler (HH) MNiSn(M = Ti, Zr) intermetallic compounds has been investigated systematically in this study. Scanning electron microscopy observations from a range of (Tix, Zr1-x)NiSn have revealed the HH single phase at high temperature formed into many HH domains of various HH compositions with different Ti/Zr concentration ratios when x > 0.1. The formation of Ti-rich and Zr-rich HH domains with rather large size (up to several hundred μm in diameter) is thought to originate from a combination of the liquid solidification process and followed by an HH phase decomposition process within a miscibility gap between the TiNiSn and ZrNiSn HH phases. We have noticed that in addition to the mass and size difference based phonon scattering, sharp interfaces between the Ti-rich and Zr-rich HH domains containing high density of misfit dislocations could provide additional phonon scattering centers and reduced thermal conductivity of the alloys. Moreover, the cyclic heat treatment process at temperatures near the HH phase-decomposition's critical temperature could modify the HH domains' microstructure to become more diffuse, coherent with a more comprehensive length scale, and globular shape. These diffuse and coherent Ti-rich HH1/Zr-rich HH2 interfaces can provide an additional enhancement of phonon scattering and thereby result in a more considerable reduction of thermal conductivity than those of relatively less diffuse ones. We anticipate a similar approach of using cyclic heat treatment to modify the microstructure and consequently lead to further enhancement of phonon scattering can also apply to many other thermoelectric alloy systems possessing a miscibility gap.
  • Disconnections and Laves (C14) precipitation in high-Cr ferritic stainless steels
    Yaw Wang Chai, Ko Kato, Chieri Yabu, Shin Ishikawa, Yoshisato Kimura
    Acta Materialia, 2020
    Even though it is widely accepted that the Laves phase is a promising strengthener for chromium-containing stainless steels, there is little information available on its microstructural evolution and growth. Therefore, in this study, we analysed the behaviour of Laves (C14) precipitates in high-Cr ferritic stainless steel, Fe-20Cr-2Mo-0.5Nb (at%), annealed at 1073 K for different time periods. A high density of (Fe,Cr)2(Mo,Nb) precipitates was formed in the α matrix during annealing. Morphological evolution in the Laves phase followed the sequence of spheroidal → faceted ellipsoidal → faceted needle-like → faceted plate-like. The Laves phase is related to the α matrix by two sets of orientation relationships, viz. OR-1: [ 1 ¯ 1 ¯ 2 ] α / [ 1 2 ¯ 10 ] L , [ 111 ] α / [ 0 1 ¯ 10 ] L , and ( 1 ¯ 10 ) α / ( 000 1 ¯ ) L and OR-2: [ 1 1 ¯ 0 ] α / [ 0001 ] L , [ 113 ] α / [ 1 ¯ 1 ¯ 20 ] L , and ( 3 ¯ 3 ¯ 2 ) α / ( 1 1 ¯ 00 ) L . The habit plane of the Laves phase was found to deviate slightly from the ( 3 ¯ 3 ¯ 2 ) α / ( 1 1 ¯ 00 ) L plane. Interfacial defects, namely disconnections (bD, h) and super disconnections (mbD, mh), observed experimentally along the habit plane, were consistent with theoretical results based on OR-2 as the reference coordinate frame. The Burgers vector bD exhibited an edge component b y D (0.1539 nm) parallel to Y / [ 113 ] α / [ 1 ¯ 1 ¯ 20 ] L and a small normal component b z D (0.0747 nm) perpendicular to the terraces; meanwhile, the overlap step height h = d ( 1 1 ¯ 00 ) L . The morphological evolution of Laves precipitates was described based on the lateral motion of disconnections and super disconnections on { 3 ¯ 3 ¯ 2 } α / { 1 1 ¯ 00 } L terraces in the 〈 113 〉 α / 〈 1 ¯ 1 ¯ 20 〉 direction. Arrays of the disconnections (bD, h) were found to be capable of accommodating the misfit strain on { 3 ¯ 3 ¯ 2 } α / { 1 1 ¯ 00 } L terraces.
  • Reduced Thermal Conductivity of Mg2(Si, Sn) Solid Solutions by a Gradient Composition Layered Microstructure
    Zhifang Zhou, Yaw Wang Chai, Yu Ikuta, Yonghoon Lee, Yuanhua Lin, Yoshisato Kimura
    ACS Applied Materials and Interfaces, 2020
    Solid solutioning of Mg2(Si, Sn) has been a promising approach in reducing thermal conductivity and leads to improvement of thermoelectric performance. In addition to the Mg2(Si, Sn) solid solutions, we have noticed layered structure with gradient composition, which is formed by non-equilibrium solidification and peritectic reaction process, can provide further reduction of thermal conductivity of the Mg2(Si, Sn) solid solutions. All the layers of the layered structure have the same face centered cubic (FCC)-based structure but varying Sn/Si concentration ratios in each layer. The interfaces between the layers are semi-coherent reticulating with different numbers of misfit dislocations. Such interfacial structure brings large numbers of phonon scattering sources, resulting in the further reduction of thermal conductivity in the Mg2(Si, Sn) solid solutions. Consequently, the undoped Mg2Si0.75Sn0.25 containing higher density of the layered structure has relatively lower thermal conductivity, 1.9 W m -1 K -1 at 523 K than Mg2Si0.25Sn0.75 with much lower density of the layered structure, 2.3 W m -1 K -1 at 523 K.
  • Nanoscale hierarchical structure of twins in nanograins embedded with twins and the strengthening effect
    Haochun Tang, Tso-Fu Mark Chang, Yaw-Wang Chai, Chun-Yi Chen, Takashi Nagoshi, Daisuke Yamane, Hiroyuki Ito, Katsuyuki Machida, Kazuya Masu, Masato Sone
    Metals, 2019
    Hierarchical structures of 20 nm grains embedded with twins are realized in electrodeposited Au–Cu alloys. The electrodeposition method allows refinement of the average grain size to 20 nm order, and the alloying stabilizes the nanoscale grain structure. Au–Cu alloys are face-centered cubic (FCC) metals with low stacking fault energy that favors formation of growth twins. Due to the hierarchical structure, the Hall–Petch relationship is still observed when the crystalline size (average twin space) is refined to sub 10 nm region. The yield strength reaches 1.50 GPa in an electrodeposited Au–Cu alloy composed of 16.6 ± 1.1 nm grains and the average twin spacing at 4.7 nm.
  • Stabilizing austenite via a core-shell structure in the medium Mn steels
    Xinhao Wan, Geng Liu, Ran Ding, Nobuo Nakada, Yaw-Wang Chai, Zhigang Yang, Chi Zhang, Hao Chen
    Scripta Materialia, 2019
  • Effects of Si on Phase Stability and Precipitation Behavior of C14 Laves Phase (Fe,Cr)2(Nb,Mo) in High Cr αfe-base Alloys
    Yoshisato Kimura, Ko Kato, Yaw Wang Chai
    MRS Advances, 2019
  • Thermoelectric properties of nearly single-phase ¢-FeSi2 alloys fabricated by gas-atomized powder sintering
    Yoshisato Kimura, Masashi Yamada, Yaw Wang Chai
    Materials Transactions, 2019
  • Evaluation of Microstructure Formation and Phase Equilibria for Thermoelectric β-FeSi2 Composite Alloys
    Yoshisato Kimura, Hiroaki Otani, Ayaka Mori, Yaw-Wang Chai
    MRS Advances, 2017
  • The effect of an isoelectronic Ti-Zr substitution on Heusler nanoprecipitation and the thermoelectric properties of a (Ti0.2,Zr0.8)Ni1.1Sn half-Heusler alloy
    Yaw Wang Chai, Toshinori Oniki, Takahiro Kenjo, Yoshisato Kimura
    Journal of Alloys and Compounds, 2016
  • Microstructure and thermoelectric properties of a ZrNi1.1Sn half-Heusler alloy
    Yaw Wang Chai, Toshinori Oniki, Yoshisato Kimura
    Acta Materialia, 2015
  • Ordered Structures and Thermoelectric Properties of MNiSn (M = Ti, Zr, Hf)-Based Half-Heusler Compounds Affected by Close Relationship with Heusler Compounds
    Yoshisato Kimura, Yaw-Wang Chai
    JOM, 2015
  • Solid solution behavior and thermoelectric properties of half-heusler (Zrx, Nb1-x)(Niy, Co1-y)Sn alloy
    Kentaro Yoshioka, Yaw Wang Chai, Yoshisato Kimura
    Nippon Kinzoku Gakkaishi Journal of the Japan Institute of Metals, 2015
  • Fabrication of β-FeSi2-based thermoelectric composite alloys by oxidation and reduction reactions during sintering of eutectoid si and iron oxide powder
    Yoshisato Kimura, Koichiro Takeno, Ayaka Mori, Yaw-Wang Chai
    Nippon Kinzoku Gakkaishi Journal of the Japan Institute of Metals, 2015
  • Thermoelectric properties control of half-Heusler compounds by lattice defects and interfaces introduced based on the close relationship with Heusler compounds
    Yoshisato Kimura, Yaw-Wang Chai, Toshinori Oniki, Takahiko Itagaki, Shinya Otani
    Materials Research Society Symposium Proceedings, 2015
  • Intrinsic point defects in thermoelectric half-Heusler alloys
    Yaw Wang Chai, Kentaro Yoshioka, Yoshisato Kimura
    Scripta Materialia, 2014
  • Microstructure evolution of nanoprecipitates in half-Heusler TiNiSn alloys
    Yaw Wang Chai, Yoshisato Kimura
    Acta Materialia, 2013
  • Effect of interstitial carbon atoms on phase stability and mechanical properties of E21 (L12) Ni3AlC1-x single crystals
    Yoshisato Kimura, Masato Kawakita, Hiroyasu Yuyama, Yaw-Wang Chai
    Materials Research Society Symposium Proceedings, 2013
  • Nanosized precipitates in half-Heusler TiNiSn alloy
    Yaw Wang Chai, Yoshisato Kimura
    Applied Physics Letters, 2012
  • Effect of vacancy-site occupation in half-Heusler compound ZrNiSn on phase stability and thermoelectric properties
    Yoshisato Kimura, Toshiyasu Tanoguchi, Yasuhiro Sakai, Yaw-Wang Chai, Yoshinao Mishima
    Materials Research Society Symposium Proceedings, 2011
  • Thermoelectric performance of half-Heusler TiNiSn alloys fabricated by solid-liquid reaction sintering
    Yoshisato Kimura, Chihiro Asami, Yaw Wang Chai, Yoshinao Mishima
    Materials Science Forum, 2010
  • Improvements in honeycomb abradable seals
    D.J. Potter, Y.W. Chai, G.J. Tatlock
    Materials at High Temperatures, 2009
  • Self-accommodation in Ti-Nb shape memory alloys
    Y.W. Chai, H.Y. Kim, H. Hosoda, S. Miyazaki
    Acta Materialia, 2009
  • Interfacial defects in Ti-Nb shape memory alloys
    Y.W. Chai, H.Y. Kim, H. Hosoda, S. Miyazaki
    Acta Materialia, 2008
  • Chapter 74 Topological Modelling of Martensitic Transformations
    R.C. Pond, X. Ma, Y.W. Chai, J.P. Hirth
    Dislocations in Solids, 2007
  • Interfacial Defects at β/α" Interface in Ti-Nb Shape Memory Alloys
    Ti 2007 Proceedings of the 11th World Conference on Titanium, 2007
  • Martensitic transformations in 'unfamiliar' systems
    R.C. Pond, Y.W. Chai, S. Celotto
    Materials Science and Engineering A, 2004
  • Kinematic and topological models of martensitic interfaces
    Robert C. Pond, Xiao Ma, Yaw W. Chai, John P. Hirth
    Materials Research Society Symposium Proceedings, 2004

RECENT SCHOLAR PUBLICATIONS

  • Compositional Gradient Layered Microstructure Control for Reducing Lattice Thermal Conductivity of Mg2 (Si, Sn) Thermoelectric Alloys
    F Zhang, YW Chai, Y Wang, Y Lee, Y Kimura
    MATERIALS TRANSACTIONS 67 (5), 842-853 , 2026
    2026
  • Influence of elastic energy on the microstructure of nano TiNi2Sn precipitates within a Half-Heusler TiNiSn matrix
    M Shmulevitsh, Y Gelbstein, YW Chai, RZ Shneck
    Acta Materialia 296, 121243 , 2025
    2025
  • Phase stability and thermal expansion properties of additive manufactured super-invar alloy
    S Cai, R Nagashima, YW Chai, N Sakaguchi, N Nakada
    ISIJ International 65 (8), 1201-1208 , 2025
    2025
    Citations: 3
  • Interdiffusion of solute elements in the α-Fe phase of the Fe–Cr–Mo and Fe–Cr–Si ternary systems
    D Lee, M Tsuyuguchi, M Watanabe, YW Chai, T Yamashita, S Ishikawa, ...
    ISIJ International 64 (5), 826-835 , 2024
    2024
    Citations: 1
  • Intermetallic precipitation and oxidation behavior of a Fe–20Cr–0.5 Nb–2Mo (at%) high-Cr ferritic alloy
    YAWW CHAI, YW Chai, S Kondo, K Kanai, D Lee
    (No Title) , 2024
    2024
  • Intermetallic phase precipitation and oxidation behavior of Fe–20Cr–0.5 Nb–2Mo (at%) high-Cr ferritic alloy at high temperatures
    S Kondo, YW Chai, K Kanai, L Dosung, M Watanabe, S Ishikawa, ...
    Acta Materialia 246, 118677 , 2023
    2023
    Citations: 22
  • Solid-phase reaction and microstructure formation in Fe-Nb and Fe-Mo binary diffusion couples
    D Lee, M Tsuyuguchi, M Watanabe, YAWW CHAI, YW Chai
    (No Title) , 2023
    2023
  • Effect of doping and heat-treatment process on the full-Heusler microstructure and thermoelectric properties of half-Heusler alloys
    YAWW CHAI, YW Chai, Y KIMURA
    (No Title) , 2023
    2023
  • Effect of Mo addition on laves phase precipitation behavior in Fe-20% Cr-x% Nb alloys
    S Ishikawa, T Yamashita, T Kiryu, YW Chai, Y Kimura
    Materials Characterization 190, 112077 , 2022
    2022
    Citations: 18
  • Disconnections and Laves (C14) precipitation in a high-Cr Fe-based alloy
    YAWW CHAI, YW Chai
    (No Title) , 2022
    2022
  • Evaluation of NP type conversion mechanism in thermoelectric Zr (Ni, X) Sn (X= Ir, Co) by first-principles calculation
    YA CHEN, YA Chen, M Watanabe, Y Gohda, Y KIMURA, YAWW CHAI, ...
    (No Title) , 2022
    2022
  • Precipitation of Intermetallic Phases and Mutual Effects with High Temperature Oxidation in the Fe-Cr-Nb-Mo Ferrite Alloys
    Y KIMURA, M WATANABE, YW CHAI
    ふぇらむ 27 (7), 457-466 , 2022
    2022
  • Effect of half-heusler interfacial structure on thermal transport properties of (Ti, Zr) NiSn alloys
    M Sato, YW Chai, Y Kimura
    ACS applied materials & interfaces 13 (21), 25503-25512 , 2021
    2021
    Citations: 18
  • Disconnections and Laves (C14) precipitation in high-Cr ferritic stainless steels
    YW Chai, K Kato, C Yabu, S Ishikawa, Y Kimura
    Acta Materialia 198, 230-241 , 2020
    2020
    Citations: 54
  • Reduced Thermal Conductivity of Mg 2 (Si, Sn) Solid Solutions by a Gradient Composition Layered Microstructure
    Z Zhou, YW Chai, Y Ikuta, Y Lee, Y Lin, Y Kimura
    ACS Applied Materials & Interfaces 12 (17), 19547-19552 , 2020
    2020
    Citations: 24
  • Multiscale microstructure engineering and the development of high performance, environmental friendly, low cost and thermally stable half-Heusler thermoelectric materials
    YW Chai, Y Kimura
    Impact 2020 (1), 65-67 , 2020
    2020
    Citations: 1
  • Nanoscale hierarchical structure of twins in nanograins embedded with twins and the strengthening effect
    H Tang, TFM Chang, YW Chai, CY Chen, T Nagoshi, D Yamane, H Ito, ...
    Metals 9 (9), 987 , 2019
    2019
    Citations: 13
  • Stabilizing austenite via a core-shell structure in the medium Mn steels
    X Wan, G Liu, R Ding, N Nakada, YW Chai, Z Yang, C Zhang, H Chen
    Scripta Materialia 166, 68-72 , 2019
    2019
    Citations: 73
  • Thermoelectric properties of nearly single-phase β-FeSi2 alloys fabricated by gas-atomized powder sintering
    Y Kimura, M Yamada, YW Chai
    MATERIALS TRANSACTIONS 60 (5), 652-661 , 2019
    2019
    Citations: 9
  • Effects of Si on phase stability and precipitation behavior of C14 laves phase (Fe, Cr) 2 (Nb, Mo) in high Cr αFe-base alloys
    Y Kimura, K Kato, YW Chai
    MRS Advances 4 (25-26), 1477-1483 , 2019
    2019
    Citations: 12

MOST CITED SCHOLAR PUBLICATIONS

  • Self-accommodation in Ti–Nb shape memory alloys
    YW Chai, HY Kim, H Hosoda, S Miyazaki
    Acta materialia 57 (14), 4054-4064 , 2009
    2009
    Citations: 228
  • Interfacial defects in Ti–Nb shape memory alloys
    YW Chai, HY Kim, H Hosoda, S Miyazaki
    Acta Materialia 56 (13), 3088-3097 , 2008
    2008
    Citations: 127
  • Topological modelling of martensitic transformations
    RC Pond, X Ma, YW Chai, JP Hirth
    Dislocations in solids 13, 225-261 , 2007
    2007
    Citations: 84
  • Nanosized precipitates in half-Heusler TiNiSn alloy
    Y Wang Chai, Y Kimura
    Applied Physics Letters 100 (3) , 2012
    2012
    Citations: 80
  • Microstructure evolution of nanoprecipitates in half-Heusler TiNiSn alloys
    YW Chai, Y Kimura
    Acta materialia 61 (18), 6684-6697 , 2013
    2013
    Citations: 78
  • Stabilizing austenite via a core-shell structure in the medium Mn steels
    X Wan, G Liu, R Ding, N Nakada, YW Chai, Z Yang, C Zhang, H Chen
    Scripta Materialia 166, 68-72 , 2019
    2019
    Citations: 73
  • Microstructure and thermoelectric properties of a ZrNi1. 1Sn half-Heusler alloy
    YW Chai, T Oniki, Y Kimura
    Acta Materialia 85, 290-300 , 2015
    2015
    Citations: 64
  • Ordered structures and thermoelectric properties of MNiSn (M= Ti, Zr, Hf)-based half-Heusler compounds affected by close relationship with Heusler compounds
    Y Kimura, YW Chai
    Jom 67 (1), 233-245 , 2015
    2015
    Citations: 60
  • Disconnections and Laves (C14) precipitation in high-Cr ferritic stainless steels
    YW Chai, K Kato, C Yabu, S Ishikawa, Y Kimura
    Acta Materialia 198, 230-241 , 2020
    2020
    Citations: 54
  • The effect of an isoelectronic Ti–Zr substitution on Heusler nanoprecipitation and the thermoelectric properties of a (Ti0. 2, Zr0. 8) Ni1. 1Sn half-Heusler alloy
    YW Chai, T Oniki, T Kenjo, Y Kimura
    Journal of Alloys and Compounds 662, 566-577 , 2016
    2016
    Citations: 42
  • Intrinsic point defects in thermoelectric half-Heusler alloys
    YW Chai, K Yoshioka, Y Kimura
    Scripta Materialia 83, 13-16 , 2014
    2014
    Citations: 32
  • Reduced Thermal Conductivity of Mg 2 (Si, Sn) Solid Solutions by a Gradient Composition Layered Microstructure
    Z Zhou, YW Chai, Y Ikuta, Y Lee, Y Lin, Y Kimura
    ACS Applied Materials & Interfaces 12 (17), 19547-19552 , 2020
    2020
    Citations: 24
  • Intermetallic phase precipitation and oxidation behavior of Fe–20Cr–0.5 Nb–2Mo (at%) high-Cr ferritic alloy at high temperatures
    S Kondo, YW Chai, K Kanai, L Dosung, M Watanabe, S Ishikawa, ...
    Acta Materialia 246, 118677 , 2023
    2023
    Citations: 22
  • Improvements in honeycomb abradable seals
    DJ Potter, YW Chai, GJ Tatlock
    Materials at High Temperatures 26 (2), 127-135 , 2009
    2009
    Citations: 19
  • Effect of Mo addition on laves phase precipitation behavior in Fe-20% Cr-x% Nb alloys
    S Ishikawa, T Yamashita, T Kiryu, YW Chai, Y Kimura
    Materials Characterization 190, 112077 , 2022
    2022
    Citations: 18
  • Effect of half-heusler interfacial structure on thermal transport properties of (Ti, Zr) NiSn alloys
    M Sato, YW Chai, Y Kimura
    ACS applied materials & interfaces 13 (21), 25503-25512 , 2021
    2021
    Citations: 18
  • Nanoscale hierarchical structure of twins in nanograins embedded with twins and the strengthening effect
    H Tang, TFM Chang, YW Chai, CY Chen, T Nagoshi, D Yamane, H Ito, ...
    Metals 9 (9), 987 , 2019
    2019
    Citations: 13
  • Effects of Si on phase stability and precipitation behavior of C14 laves phase (Fe, Cr) 2 (Nb, Mo) in high Cr αFe-base alloys
    Y Kimura, K Kato, YW Chai
    MRS Advances 4 (25-26), 1477-1483 , 2019
    2019
    Citations: 12
  • Thermoelectric performance of Half-Heusler TiNiSn alloys fabricated by solid-liquid reaction sintering
    Y Kimura, C Asami, YW Chai, Y Mishima
    Materials Science Forum 654, 2795-2798 , 2010
    2010
    Citations: 10
  • Thermoelectric properties of nearly single-phase β-FeSi2 alloys fabricated by gas-atomized powder sintering
    Y Kimura, M Yamada, YW Chai
    MATERIALS TRANSACTIONS 60 (5), 652-661 , 2019
    2019
    Citations: 9