Remarks on the Notch Sensitivity of Bulk Metallic Glasses

Remarks on the Notch Sensitivity of Bulk Metallic Glasses
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关于大块金属玻璃的缺口敏感性的评论

DOI:
10.1007/s11837-019-03949-z
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发表时间:
2020-02
期刊:
JOM
影响因子:
2.6
通讯作者:
Yanfei Gao
Yanfei Gao
中科院分区:
材料科学3区
文献类型:
--
作者:
Yanchun Zhao;Yanfei Gao

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由于缺口试样的应力三轴度可以很容易地控制,对缺口试样的测试可以为验证各种大块金属玻璃(BMG)本构模型提供重要信息。通常,缺口样品表现出增强的延展性,但它们的强度可以降低或提高,甚至对缺口几何参数不敏感。在比较传统金属材料缺口研究的基础上,(表现出空穴控制故障)和复合材料(表现出裂纹桥接),以及组装许多最近的缺口研究BMG,这篇评论评估了以下关键因素:应力三轴性在自由体积演化的原子过程中的作用,剪切带和空蚀破坏之间的竞争和协同作用,以及剪切带的几何布置延迟剪切或空化破坏。还解释了防止统一预测的困难。
Since the degree of stress triaxiality can be easily manipulated in notched samples, tests on them can provide crucial information to verify various constitutive models of bulk metallic glasses (BMGs). Oftentimes, notched samples exhibit enhanced ductility, but their strength can be reduced or improved, or even be insensitive to, the notch geometric parameters. Based on a comparison of notch studies on conventional metallic materials (that exhibit cavitation-controlled failure) and composites (that exhibit crack bridging), as well as by assembling many recent notch studies on BMGs, this review assesses the following key factors: the role of stress triaxiality in the atomistic processes for free volume evolution, the competition between and synergy of shear banding and cavitation failure, and the geometric arrangements of shear bands that delay shear or cavitation failure. Difficulties that prevent unified predictions are also explained.
DOI: 10.1016/s0065-2156(08)70195-9
发表时间: 1989
影响因子: --
作者:
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通讯作者: V. Tvergaard
DOI: 10.1016/0022-5096(84)90031-0
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