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説明:

A rigorous identification of the temperature-dependent, rate-controlling dislocation mechanisms and their associated kinetics in refractory multi-principal element alloys (RMPEAs) is fundamental to the development of predictive strengthening frameworks. In this work, we isolate single-slip (110)⟨111⟩ plasticity in the bcc RMPEA Hf10Mo10Nb35Ta20Ti25 using orientation-controlled micropillar compression between 200–300 K and strain rates from 10−3 to 102 s−1. The adherence to a single-slip condition enables direct determination of the temperature and strain-rate dependence of the critical resolved shear stress and the associated activation parameters. By combining transmission electron microscopy, phase-field dislocation dynamics (PFDD) simulations, and analytical strengthening models, the governing dislocation-mediated plasticity mechanism and its temperature evolution are identified. The results establish the rate-limiting role of screw dislocations, quantify the relative mobility of edge and screw segments, and assess the predictive capability of existing analytical models. The convergence between experiment, theoretical models and PFDD simulation provides a mechanistically consistent framework for understanding temperature-dependent plasticity in chemically complex bcc alloys and advances the development of physics-based strengthening descriptions for RMPEAs.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Refractory high-entropy alloy, Micro-pillar compression, Thermally-activated plasticity, Activation parameters, Phase-field dislocation dynamics

刊行年月日: 2026-09-25

出版者: Elsevier BV

掲載誌:

• Acta Materialia (ISSN: 13596454) vol. 321 122791

研究助成金:

• US Army DEVCOM Army Research Laboratory W911NF-22-2-0121
• National Science Foundation DMR-20132308708
• National Science Foundation 2320030
• National Science Foundation 2117843
• National Nuclear Security Administration DE-NA0004152
• University of California L22CR4520 (UC National Laboratory Fees Research Program)

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.actamat.2026.122791

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更新時刻: 2026-09-28 19:40:51 +0900

MDRでの公開時刻: 2026-09-29 10:40:47 +0900