Strain rate dependence of plastic flow in Ce-based bulk metallic glass during nanoindentation

Strain rate dependence of plastic flow in Ce-based bulk metallic glass during nanoindentation
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纳米压痕过程中 Ce 基大块金属玻璃塑性流动的应变率依赖性

DOI:
10.1557/jmr.2007.0039
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发表时间:
2007-02
影响因子:
2.7
通讯作者:
--
中科院分区:
材料科学4区
文献类型:
--
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采用纳米压痕法研究了Ce60Al15Cu10Ni15大块非晶合金塑性变形的应变速率依赖性。尽管室温与玻璃化转变温度的比值很高(0.72),但该合金的塑性变形仍以纳米压痕下的剪切带为主。该合金表现出临界加载速率依赖的锯齿形流动特征。也就是说,随着加载速率的增加,合金在连续加载期间表现出从不太突出的锯齿状流动到明显的锯齿状流动的过渡,但在阶梯式加载期间从锯齿状流动到更平滑的流动。
The strain rate dependence of plastic deformation of Ce_60Al_15Cu_10Ni_15 bulk metallic glass was studied by nanoindentation. Even though the ratio of room temperature to the glass transition temperature was very high (0.72) for this alloy, the plastic deformation was dominated by shear banding under nanoindentation. The alloy exhibited a critical loading rate dependent serrated flow feature. That is, with increasing loading rate, the alloy exhibited a transition from less prominent serrated flow to pronounced serrated flow during continuous loading but from serrated to smoother flow during stepped loading.
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