High strength and ductility in a lightweight AlTiNbZrTa refractory high-entropy alloy enabled by nanophase precipitation and solute segregation

IF 17.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Matter Pub Date : 2025-06-20 DOI:10.1016/j.matt.2025.102204

Muhammad Abubaker Khan, Jamieson Brechtl, Li Jingyuan, N. Radhika, Yong Zhang, Peter K. Liaw, Wei-Bing Liao, Mohamed A. Afifi

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Abstract

A lightweight body-centered-cubic (BCC) AlTiNbZrTa refractory high-entropy alloy (RHEA) was developed, exhibiting an exceptional combination of high tensile strength (∼1,140 MPa) and ductility (∼30.2% elongation) after a tailored thermomechanical treatment (TMT). This TMT process resulted in significant microstructural refinement, including grain-size reduction, a high density of dislocations, and crucially, the formation of homogeneously distributed B2 and Zr₅Al₃-type nanophases. These nanophases are a direct consequence of solute segregation to dislocations during cold rolling, followed by precipitation during a subsequent heat treatment. The good mechanical properties of this RHEA are attributed to the combined effects of solid-solution strengthening, grain-boundary strengthening, dislocation strengthening, and precipitation hardening. Interestingly, solute segregation along dislocations is observed after cold rolling, resulting in the formation of B2 and Zr₅Al₃-type phases during the post-rolling heat treatment. In summary, this lightweight RHEA demonstrates significant potential for high-performance structural applications.

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纳米相析出和溶质偏析使轻质AlTiNbZrTa难熔高熵合金具有高强度和延展性

开发了一种轻质体心立方（BCC） AlTiNbZrTa耐火高熵合金（RHEA），在经过量身定制的热机械处理（TMT）后，表现出高抗拉强度（~ 1,140 MPa）和延展性（~ 30.2%伸长率）的特殊组合。这种TMT工艺导致了显著的显微组织细化，包括晶粒尺寸减小，位错密度高，最重要的是，形成了均匀分布的B2和zr5al3型纳米相。这些纳米相是冷轧过程中溶质偏析到位错的直接结果，随后在随后的热处理过程中析出。该合金具有良好的力学性能是固溶强化、晶界强化、位错强化和沉淀硬化共同作用的结果。有趣的是，冷轧后出现了沿位错方向的溶质偏析，导致轧制后热处理形成B2和zr5al3型相。总之，这种轻质的RHEA在高性能结构应用中显示出巨大的潜力。

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来源期刊

Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

26.30

自引率

2.60%

发文量

367

期刊介绍： Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content. Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.