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high entropy alloys via interstitial carbon solutionFang, W.*; Liu, C.*; 吉田 周平*; Peng, T. X.*; 徐 平光; Han, Y.*; Li, J.*; Yin, F.*; 辻 伸泰*
Materials Science & Engineering A, 977, p.151109_1 - 151109_12, 2026/12
Interstitial alloying is an effective strategy for enhancing the mechanical properties of high-entropy alloys (HEAs). However, in carbon-containing HEAs, the coexistence of interstitial carbon and carbides complicates the investigation of interstitial carbon's individual effects on strength and ductility. To address this, a carbide-free interstitial strengthened HEA, FeMnCoNiC, was designed by incorporating elements with low carbon affinity, enabling a clear assessment of the role of interstitial carbon. The results demonstrate that interstitial carbon solution simultaneously improves strength, ductility, and work hardening capability. Synchrotron radiation experiments reveal that the interstitial carbon containing alloy sustains higher lattice elastic strain, dislocation density, and stacking fault probability during tensile deformation, with the increased dislocation density being the primary contributor to enhanced work hardening. First principles calculations further elucidate the lattice distortion, chemical inhomogeneity and electronic localization effects induced by interstitial carbon, as well as their potential influence on strength and ductility. This study highlights the importance of carbide-free interstitial carbon-strengthened HEAs for a fundamental understanding of carbon's influence on mechanical properties.
Lin, Z. M.*; Liu, B. X.*; Ming, K. S.*; 徐 平光; Yin, F. X.*; Zheng, S. J.*
Scripta Materialia, 263, p.116692_1 - 116692_7, 2025/07
被引用回数：3 パーセンタイル：56.20(Nanoscience & Nanotechnology)Complementary layer thickness effects on strength and plasticity in Q235 and SUS304 steels provide a novel strategy to realize high strength and high plasticity of heterogeneous Q235/SUS304 multilayered steel. In this work, the tensile deformation behaviors and fracture characteristics of vacuum hot-rolled Q235/SUS304 multilayered steel with various layer thicknesses ranging from 223 
m to 5 m were deeply investigated. The tensile strength improved with the reduction of layer thickness, and the uniform elongation were first increasing and then decreasing with the decrease of layer thickness, and the peak value appeared at the layer thickness of 20 m. Interestingly, the fracture elongation forms a high plateau value within the 10
20 m range. Further analysis reveals that the severe strain localization in the brittle SUS304 thin layers is delayed by the ductile Q235 layers, which is mainly attributed to the different texture evolution and dislocation configuration characteristics during tensile deformation.
Liu, P.-F.*; Li, X.*; Li, J.*; Zhu, J.*; Tong, Z.*; 古府 麻衣子*; 楡井 真実; Xu, J.*; Yin, W.*; Wang, F.*; et al.
National Science Review, 11(12), p.nwae216_1 - nwae216_10, 2024/12
被引用回数：31 パーセンタイル：91.47(Multidisciplinary Sciences)Crystalline solids exhibiting inherently low lattice thermal conductivity (
) are of great importance in applications such as thermoelectrics and thermal barrier coatings. However, cannot be arbitrarily low and is limited by the minimum thermal conductivity related to phonon dispersions. In this work, we report the liquid-like thermal transport in a well-ordered crystalline CsAg
Te
, which exhibits an extremely low value of 0.18 Wm
K. On the basis of first-principles calculations and inelastic neutron scattering measurements, we find that there are lots of low-lying optical phonon modes at 3.1 meV hosting the avoided-crossing behavior with acoustic phonons. These strongly localized modes are accompanied by weakly bound rattling Ag atoms with thermally induced large amplitudes of vibrations. Using the two-channel model, we demonstrate that coupling of the particle-like phonon modes and the heat-carrying wave-like phonons is essential for understanding the low , which is heavily deviated from the 
temperature dependence of the standard Peierls theory. In addition, our analysis indicates that the soft structural framework with liquid-like motions of the fluctuating Ag atoms is the underlying cause that leads to the suppression of the heat conduction in CsAgTe. These factors synergistically account for the ultralow value. Our results demonstrate that the liquid-like heat transfer could indeed exist in a well-ordered crystal.
Chen, H. F.*; Liu, B. X.*; 徐 平光; Fang, W.*; Tong, H. C.*; Yin, F. X.*
Journal of Materials Research and Technology, 32, p.3060 - 3069, 2024/09
被引用回数：9 パーセンタイル：66.69(Materials Science, Multidisciplinary)The hot-rolled microstructure of medium Mn steel has coarse grains and severe elemental segregation, resulting in low strength and plasticity. Constructing a multiphase structure, refining the microstructure, and regulating elemental segregation enhance the mechanical properties. In this study, liquid nitrogen treatment created a layered distribution of austenite and martensite. Warm rolling was then used to reduce layer thickness and refine grain structure. After liquid nitrogen and warm rolling treatments, the strength and plasticity of medium Mn steel increased to 1270 MPa and 23.3%, respectively, far exceeding the hot-rolled state (724 MPa, 12.8%). Warm rolling also triggers austenite reverted transformation (ART) and introduces high-density dislocations, further improving austenite stability. This strengthening effect is higher than that from intercritical annealing alone. Improved austenite stability delays the transformation induced plasticity (TRIP) effect, preventing brittle fracture and enhancing deformation coordination between layers, significantly increasing the plastic deformation capacity of medium Mn steel.
Fang, W.*; Liu, C.*; Zhang, J.*; 徐 平光; Peng, T.*; Liu, B.*; 諸岡 聡; Yin, F.*
Scripta Materialia, 249, p.116046_1 - 116046_6, 2024/08
被引用回数：5 パーセンタイル：44.40(Nanoscience & Nanotechnology)The influence of interstitial carbon on the texture evolution of high-entropy alloys during cold rolling was investigated. To prevent carbide formation, elements with weak carbon affinity were carefully selected in the (FeMnCoNi)
C
alloy. Neutron diffraction, electron channeling contrast imaging, and electron backscatter diffraction were used to analyze the texture and microstructure evolution in alloys with and without carbon addition. Though their texture components are similar at the early stage of deformation, the Brass and Goss textures in the carbon-containing alloy at 50% cold rolling reduction are obviously higher than those in the carbon-free alloy, while Copper and S textures are lower. A large number of deformation twins induced in the carbon containing alloy is attributed as the significant reason for the texture differences. This work helps to understand the impact of interstitial carbon on the texture evolution of high-entropy alloys, providing valuable insights for microstructure and performance optimization.
FCC hierarchical martensite transformation under dynamic impact in FeMnAlNiTi alloyLi, C.*; Fang, W.*; Yu, H. Y.*; Peng, T.*; Yao, Z. T.*; Liu, W. G.*; Zhang, X.*; 徐 平光; Yin, F.*
Materials Science & Engineering A, 892, p.146096_1 - 146096_11, 2024/02
被引用回数：7 パーセンタイル：57.05(Nanoscience & Nanotechnology)The quasi-static superelastic responses and hierarchical martensite transformation from body-centered cubic (BCC) to face-centered cubic (FCC) under dynamic impact in Fe
Mn
Al
Ni
Ti
alloys were investigated. Polycrystalline and oligocrystalline alloys were produced through solution heat treatment and cyclic heat treatment processes, respectively. The results show the volume fraction of residual martensite for oligocrystalline alloys is lower, which exhibits better superelastic responses compared with polycrystalline alloys. Dynamic impact tests indicate that, despite the weakening of the grain boundary strengthening effect, the ultimate strength of the oligocrystalline alloys closely matches that of the polycrystalline alloys under dynamic impact. The martensite transformation of the FeMnAlNiTi alloy is characterized as hierarchical under dynamic impact, and increasing strain rates and grain sizes can enhance the BCC FCC martensite transformation, resulting in higher martensite phase fractions for oligocrystalline alloys. The increase in ultimate strength is attributed to the dynamic Hall-Petch effect introduced by more martensite phase interfaces under dynamic impact.
兼田 加珠子*; 白神 宜史*; 角永 悠一郎*; 渡部 直史*; 大江 一弘*; Yin, X.*; 羽場 宏光*; 白崎 謙次*; 菊永 英寿*; 塚田 和明; et al.
International Journal of Molecular Sciences (Internet), 25(2), p.933_1 - 933_14, 2024/01
被引用回数：13 パーセンタイル：74.22(Biochemistry & Molecular Biology)Currently, targeted alpha therapy (TAT) is a new therapy involving the administration of a therapeutic drug that combines a substance of 
-emitting nuclides that kill cancer cells and a drug that selectively accumulates in cancer cells. We labeled the compounds targeting prostate specific membrane antigen (PSMA) with 
At and 
Ac. PSMA is a molecule that has attracted attention as a theranostic target for prostate cancer, and several targeted radioligands have already shown therapeutic effects in patients. The results showed that At, which has a much shorter half-life, is no less cytotoxic than Ac. In At labeling, our group has also developed an original method (Shirakami Reaction). We have succeeded in obtaining a highly purified labeled product in a short timeframe using this method.
He, H.*; Naeem, M.*; Zhang, F.*; Zhao, Y.*; Harjo, S.; 川崎 卓郎; Wang, B.*; Wu, X.*; Lan, S.*; Wu, Z.*; et al.
Nano Letters, 21(3), p.1419 - 1426, 2021/02
被引用回数：116 パーセンタイル：97.48(Chemistry, Multidisciplinary)In CrCoNi, a so-called medium-entropy alloy, an fcc-to-hcp phase transformation has long been anticipated. Here, we report an in situ loading study with neutron diffraction, which revealed a bulk fcc-to-hcp phase transformation in CrCoNi at 15 K under tensile loading. By correlating deformation characteristics of the fcc phase with the development of the hcp phase, it is shown that the nucleation of the hcp phase was triggered by intrinsic stacking faults. The confirmation of a bulk phase transformation adds to the myriads of deformation mechanisms available in CrCoNi, which together underpin the unusually large ductility at low temperatures.
Yin, H.*; Chung, B.*; Chen, F.*; 大内 隆成*; Zhao, J.*; 田中 伸幸; Sadoway, D. R.*
Nature Energy (Internet), 3(2), p.127 - 131, 2018/02
被引用回数：76 パーセンタイル：87.41(Energy & Fuels)リチウムイオン選択性を有する多孔質伝導膜を用い、正極と負極の電極金属を分離することで、性能劣化が小さく、高い充放電効率が得られるこれまでにない概念の溶融塩蓄電池の開発を行った。多孔質伝導膜にセラミックスの窒化チタン焼結体を、正・負極材に、それぞれ鉛及びリチウム鉛を使用した蓄電池を作製し、作動温度410
Cにおける100サイクル試験を行った。初期の100サイクル平均の性能で、充放電効率が90%以上と優れた性能を達成するとともに、その間の充放電効率の低下速度は1サイクル当たり0.0017%が得られた。これは10年経過後も充放電効率の劣化は10%以下と高寿命であることを示している。また、多孔質状金属(ステンレス及びチタン)に窒化チタンをコーティングした多孔質伝導膜を使用した場合においても、同様の充放電効率を示すことを明らかにした。このように本開発で導入した金属を基盤とする多孔質伝導膜は、低電気抵抗が可能な薄膜化かつ工業的スケールアップに向けた大型化が期待できるものである。
Zanino, R.*; Bagnasco, M.*; Baker, W.*; Bellina, F.*; Bruzzone, P.*; della Corte, A.*; Ilyin, Y.*; Martovetsky, N.*; Mitchell, N.*; Muzzi, L.*; et al.
IEEE Transactions on Applied Superconductivity, 16(2), p.886 - 889, 2006/06
被引用回数：7 パーセンタイル：39.70(Engineering, Electrical & Electronic)那珂核融合研究所においてITERポロイダル磁場コイル導体インサート(PFCI)の実験が予定されている。このため、PFCIの適切な実験プログラムを作成することを目的として、NbTi短尺導体サンプル実験から得られた結果の解析を行った。特に、次の項目について検討を行った;(1)巻線内の導体ジョイントがクエンチする前に導体自身の分流開始温度Tcsを測定できる可能性に関する検討。(2)解析コードMithrandirを用いて短尺導体サンプルの実験結果を解析し、いわゆる突然の又は早期のクエンチの可能性に関する検討。(3)PFCI実験における熱量法によるACロス測定の可能性。検討の結果、Tcs及びACロスの測定は可能であることがわかった。しかし、突然のクエンチについては今後のこれらの検討が必要である。
Liu, B. X.*; Lin, Z. M.*; 佐藤 成男*; 徐 平光; Yin, F. X.*
no journal, ,
The warm rolled multilayer steel presents laminate/network coupling interface and ultrafine fiber/ultrafine grain structure. It achieves high strength, high cryogenic Charpy V-notch impact toughness and excellent reverse temperature effect. This is close related to the delamination of heterogeneous interface, ultrafine fiber grains, deformation texture and dislocation density characteristics of multilayer steel. In the study, the in situ neutron diffraction based on iMATERIA was employed to deeply monitor the deformation textrure and dislocation density evolution behavior during tensile deformation of multilayer metals. The Brass {110}
112
texture in the FCC layers and the rotated cube {100}110 texture in the BCC layers suggest clearly the heterogeneous deformation crystallographic texture evolution behavior of multilayer metals with laminate/network coupling in SUS430/SUS304 steels during tensile deformation. The dislocation density in the BCC phase increases with the tensile deformation but no significant change appears in the FCC phase. The grain size of the BCC layers decreases during the tensile deformation, however, the grain size in FCC phase also decreases during the tensile deformation. Such interesting phenomenon is related to the martensitic transformation of FCC phase induced by the tensile deformation.
徐 平光; 鈴木 裕士; 目時 直人; 塩田 佳徳; 鈴木 徹也*; Yin, F. X.*; 秋田 貢一
no journal, ,
中性子回折は金属材料のバルク集合組織を測定できるが、測定精度は中性子回折装置に依存している。以前より原子力機構では、中性子応力測定装置RESA, RESAIIを利用することによりバルク材の集合組織測定を行ってきたが、近年の集合組織測定に対するニーズ増加に対応するため、他の回折装置で良好な集合組織測定が可能であるか検討した。多目的単色熱中性子ビームポートMUSASIを利用した集合組織測定を行った結果、集合組織測定実験への応用が十分可能であることを確認した。
