低温下铁钴铬镍钼 0.2 高熵合金中通过纳米孪晶和相变介导的锯齿状流动行为

IF 9.6 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Fei Chen, Fei Liu, Yuan-Biao Tan, Wei Shi, Xuan-Ming Ji, Hao Fu, Si-Yuan Wei, Song Xiang
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引用次数: 0

摘要

锯齿状流动行为被称为波特文-勒夏特列(PLC)效应,在高温变形过程中经常观察到。在这项研究中,我们报道了FeCoCrNiMo0.2高熵合金(HEA)在低温下纳米孪晶和相变介导的锯齿状流动行为。在77 K单轴拉伸变形过程中,合金表现出高密度变形纳米孪晶、交叉孪晶、层错(SFs)和lmer - cottrell锁(L-C锁)的形成。低温下较低的层错能(SFE)促进了9R相的形成。高密度的孪晶界有效地阻碍了位错的运动,导致塑性变形不稳定,促进了锯齿状流动行为。此外,9R相快速而不稳定的转变导致了明显的锯齿状流动行为。纳米孪晶、SFs、交叉孪晶、L-C锁相和9R相共同诱导了动态Hall-Petch效应,增强了变形合金在77 K时的强度-塑性协同效应和应变硬化能力。我们的工作为低温下单相FCC HEA的拉伸变形机理提供了有价值的见解。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Serrated flow behavior mediated via nano-twinning and phase transformation in FeCoCrNiMo0.2 high-entropy alloy at cryogenic temperatures

The serrated flow behavior, known as the Portevin–Le Chatelier (PLC) effect, is commonly observed during high-temperature deformation. In this study, we report a serrated flow behavior in FeCoCrNiMo0.2 high-entropy alloy (HEA), which is mediated by nano-twinning and phase transformation at cryogenic temperatures. During uniaxial tensile deformation at 77 K, the alloy exhibited the formation of high-density deformation nano-twinning, cross-twinning, stacking faults (SFs) and Lomer–Cottrell locks (L-C locks). Additionally, the lower stacking fault energy (SFE) at low temperatures promotes the formation of the 9R phase. The high-density twin boundaries effectively hinder dislocation movement, leading to the instability of plastic deformation and promoting the serrated flow behavior. Furthermore, the rapid and unstable transformation of the 9R phase contributes to the pronounced serrated flow behavior. Nano-twinning, SFs, cross-twinning, L-C locks and 9R phase collectively induce a dynamic Hall–Petch effect, enhancing the strength-ductility synergy and strain-hardening ability of deformed alloy at 77 K. Our work provides valuable insights into the mechanism of tensile deformation at cryogenic temperatures in single-phase FCC HEA.

Graphical abstract

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来源期刊
Rare Metals
Rare Metals 工程技术-材料科学:综合
CiteScore
12.10
自引率
12.50%
发文量
2919
审稿时长
2.7 months
期刊介绍: Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.
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