Novel mechanism of ultra-high adiabatic shear susceptibility in FCC-based high-entropy alloys via high-content nanoprecipitate dissolution

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-06-20 DOI:10.1016/j.actamat.2025.121280

Yao Xiao, Qinglei Zeng, Kaihui Xun, Jun Ding, Linjing Wang, Liang Wang, Yaojian Liang, Ke Jin, Shengxin Zhu, Yang Ren, Gang Sha, Lu Wang, Haosen Chen, Yunfei Xue

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Abstract

Adiabatic shear bands (ASBs) are a crucial failure mechanism of metals and alloys subjected to impact loading. The formation mechanism of ASBs in an FCC-based high-entropy alloy (HEA) featuring high-content coherent nanoprecipitates was investigated. Unlike traditional FCC-structured alloys, which generally exhibit low shear banding capabilities, the FCC-structured HEA presented herein displays ultrahigh adiabatic shear susceptibility (ASS) under dynamic loading. A novel mechanism induced by the instantaneous dissolution of high-content L1₂ nanoprecipitates at relatively low temperatures is proposed to be responsible for the enhanced shear instability. At room temperature, these high-content L1₂ nanoprecipitates significantly increase the strength; however, under dynamic loading, deformation concentration causes a local temperature rise, triggering the instantaneous dissolution of nanoprecipitates. This induces a dramatic reduction in the local shear strength and promotes ASB formation. The combined effects of the nanosized features, low-energy interfaces, and spinodal-like structures of the precipitates contribute to the instantaneous dissolution process at relatively low temperatures. This novel shearing-band mechanism suggests a novel approach for designing ductile alloys with enhanced ASS.

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高含量纳米沉淀溶出fcc基高熵合金超高绝热剪切敏感性的新机制

绝热剪切带（ASBs）是金属和合金在冲击载荷作用下的重要破坏机制。研究了含高含量相干纳米沉淀物的fcc基高熵合金（HEA）中ASBs的形成机理。传统的fcc结构合金通常表现出较低的剪切带能力，而本文提出的fcc结构HEA在动态载荷下表现出超高的绝热剪切敏感性（ASS）。高含量L12纳米沉淀物在较低温度下瞬间溶解导致剪切不稳定性增强。在室温下，这些高含量的L12纳米沉淀物显著提高了材料的强度；然而，在动加载下，变形浓度引起局部温度升高，触发纳米沉淀物的瞬时溶解。这导致了局部抗剪强度的急剧降低，并促进了ASB的形成。析出相的纳米特性、低能界面和spinodal结构的共同作用促成了在相对低温下的瞬时溶解过程。这种新颖的剪切带机制为设计具有增强ASS的延性合金提供了新的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.