Shear localization in metallic materials at high strain rates
Shear localization in metallic materials at high strain rates
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高应变率下金属材料的剪切局部化
DOI：
10.1016/j.pmatsci.2020.100755
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发表时间：
2020-11
影响因子：
37.4
通讯作者：
Meyers Marc Andre
中科院分区：
文献类型：
--
作者：
Yan Na;Li Zezhou;Xu Yongbo;Meyers Marc Andre
控制绝热剪切局部化的三个因素：应变硬化（或软化）、应变率硬化和热软化。它通常与大剪切应变 (>1)、高应变率 (103–107 s−1) 和高温（熔点的 40–100%）相关，所有这些都发生在宽度约为 1–200 μm 的狭窄区域内......这通常是一种不希望的现象，导致失效，但也有一些情况是理想的，例如。 g.、加工切屑的产生。在这里，我们回顾了从剪切带的产生到传播的理论和实验成果的发展，重点关注三个方面：新颖的实验技术、新颖的材料和纳米/微米结构效应。描述了纳米和微米尺度金属材料中绝热剪切带的主要特征。以前被确定为转变的带实际上由纳米晶/超细晶粒组成。这些晶粒是由旋转再结晶过程对微观结构的破坏产生的...对 hcp、bcc 和 fcc 合金、高熵合金、纳米晶合金和金属玻璃的剪切带内微观结构的演变及其相互作用进行了机械分析...确定了该领域的差距和未来研究的机会。现代实验表征和计算技术使得对先进材料中的绝热剪切局部化及其避免有更深刻和更具预测性的理解。
Three factors govern adiabatic shear localization: strain hardening (or softening), strain-rate hardening, and thermal softening. It is typically associated with large shear strains (>1), high strain rates (103–107 s−1), and high temperatures (40–100% of melting point), all of which happen within narrow regions with widths of about 1–200 μm...It is often an undesirable phenomenon, leading to failure, but there are situations where it is desirable, e. g., the generation of machining chips. Here, we review the development of both theoretical and experimental achievements, from the initiation of shear bands to their propagation with emphasis on three aspects: novel experimental techniques, novel materials, and nano/microstructural effects. The principal characteristics of adiabatic shear bands in metallic materials at the nano- and micro-scale are described. Bands that were formerly identified as transformed actually consist of nanocrystalline/ultrafine grains. These grains result from the breakup of the microstructure by a rotational recrystallization process...The evolution of the microstructure inside shear bands and their interactions for hcp, bcc, and fcc alloys, high-entropy alloys, nanocrystalline alloys, and metallic glasses are analyzed mechanistically...The gaps in the field and opportunities for future research are identified. Modern experimental characterization and computational techniques enable a more profound and predictive understanding of adiabatic shear localization and its avoidance in advanced materials.
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DOI：
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发表时间：
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期刊：
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