Multi-scale inhomogeneity and anomalous mechanical response of nanoscale metallic glass pillar by cryogenic thermal cycling

IF 9.6 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Rare Metals Pub Date : 2024-11-09 DOI:10.1007/s12598-024-02964-7
Xiao Liu, Si-Yi Di, Jing Zhou, Fang Miao, Hong-Ze Wang, Yi Wu, Hao-Wei Wang, Hai-Bo Ke, Qiang Li
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Abstract

The mechanical responses and structure variations of Ta80Co20 nanoscale metallic glass (MG) film samples upon cryogenic thermal cycling (CTC) treatment were studied. The simultaneous improvements of strength and deformation ability bring about a super-high strength of 4.5 GPa and a large plastic strain of about 80% after CTC treatment. The significant increase in inter-element bonding and hardness makes the activation and percolation of shear transformation zones to be more difficult and delays the yielding event, leading to the ultra-high strength. Although the TaCo MG pillar reaches a relaxation energy state, the micro- and nanoscale inhomogeneities remain induced by the local densely packed units along with crystal-like ordering embedded in the matrix. The multi-scale inhomogeneity can effectively hinder the sliding of the shear bands and improve their propagation stability, which is considered to be the origin of its excellent plasticity. Our study reveals another prospect of CTC treatment on nanoscale MG samples of constructing an anomalous inhomogeneous structure and obtaining simultaneous enhancement of strength and plasticity.

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低温热循环对纳米级金属玻璃支柱的多尺度不均匀性和异常力学响应
研究了 Ta80Co20 纳米级金属玻璃(MG)薄膜样品经低温热循环(CTC)处理后的力学响应和结构变化。经过 CTC 处理后,强度和变形能力同时提高,从而获得了 4.5 GPa 的超高强度和 80% 左右的大塑性应变。元素间结合力和硬度的大幅提高使剪切转化区的激活和渗流变得更加困难,并推迟了屈服事件的发生,从而实现了超高强度。虽然 TaCo MG 柱达到了弛豫能态,但由于基体中嵌入的局部密集单元和晶体有序性,微米和纳米尺度的不均匀性依然存在。多尺度不均匀性能有效阻碍剪切带的滑动并提高其传播稳定性,这被认为是其优异塑性的根源。我们的研究揭示了四氯化碳处理纳米级 MG 样品的另一个前景,即构建异常非均质结构并同时提高强度和塑性。
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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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