高熵合金的形变诱导非晶化和纳米晶化

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Bo Li, Nan Zi, Jiayin Zhao, Kaisheng Ming
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引用次数: 0

摘要

高熵合金(HEAs)具有优异的低温强度和韧性,是极端工程应用的关键,但其在超低温下的变形机制尚不完全清楚。在这里,我们报道了在4.2 K的拉伸载荷下,crmnnfeconi HEA在非晶带内的两种变形诱导非晶化和纳米晶化。与位错驱动的非晶化形成纳米级非晶带(nano-ABs, 5nm厚)不同,超纳米非晶带(SN-ABs, 5nm厚)是在极端局部剪切局部化下通过晶格畸变而不是位错积累形成的。同时,塑性变形引起的局部加热触发纳米abs内部的纳米晶化,产生随机取向的纳米颗粒。非晶化和纳米化有望通过耗散应变能和阻止剪切局部化为HEAs提供额外的增韧机制。至关重要的是,我们在低温锯齿状流动行为和热机械不稳定性之间建立了微观结构联系:应力下降和应变爆发与热诱导相变和纳米abs /SN-ABs形成有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Deformation-induced amorphization and nanocrystallization in high-entropy alloys
High-entropy alloys (HEAs) with exceptional cryogenic strength and toughness are pivotal for extreme engineering applications, yet their deformation mechanisms at ultra-low temperatures remain incompletely understood. Here, we report two types of deformation-induced amorphization and nanocrystallization within amorphous bands in a CrMnFeCoNi HEA under tensile loading at 4.2 K. Unlike dislocation-driven amorphization that forms nanoscale amorphous bands (nano-ABs, >5 nm thick), supra-nanometer amorphous bands (SN-ABs, <5 nm thick) emerge via lattice distortion under extreme localized shear localization rather than dislocation accumulation. Concurrently, localized heating from plastic deformation triggers nanocrystallization within nano-ABs, generating randomly oriented nanograins. The amorphization and nanocrystallization are expected to provide an extra toughening mechanism for HEAs by dissipating strain energy and impeding shear localization. Crucially, we establish a microstructural link between low-temperature serrated flow behavior and thermo-mechanical instability: stress drops and strain bursts correlate with heat-induced phase transitions and nano-ABs/SN-ABs formations.
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来源期刊
Scripta Materialia
Scripta Materialia 工程技术-材料科学:综合
CiteScore
11.40
自引率
5.00%
发文量
581
审稿时长
34 days
期刊介绍: Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.
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