Local mechanical properties and plasticity mechanisms in a Zn-Al eutectic alloy
Local mechanical properties and plasticity mechanisms in a Zn-Al eutectic alloy
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DOI：
10.1016/j.matdes.2018.07.051
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发表时间：
2018-11-05
影响因子：
8.4
通讯作者：
Korte-Kerzel, Sandra
中科院分区：
文献类型：
--
作者：
Wu, Zhicheng;Sandloebes, Stefanie;Korte-Kerzel, Sandra
在多相合金中，机械性能由单个微观结构成分的局部性质以及这些成分作为集合体的相互作用控制。为此，我们系统地研究了局部的机械性能和变形机制的微观结构成分在ZnAl4Cu1Mg0.31合金在室温（25摄氏度）和85摄氏度下使用纳米压痕测试。得到的应变速率敏感性和激活体积表明位错占主导地位的变形中的初级η-Zn相和晶粒/相界的共析structure.Further滑动，在85度C的宏观变形中的各个微观结构成分和它们的作用之间的应变分配进行了研究，使用准原位数字图像相关（DIC），补充非刚性图像配准。DIC测量结果表明，共晶和共析的殖民地进行更高的应变比初级η-Zn相晶粒。因此，所提出的方法和结果可以用于设计新的Zn-Al合金和具有改善的机械性能的其他多相合金。(C)2018爱思唯尔有限公司版权所有。
In multiphase alloys, the mechanical properties are controlled by both the local properties of individual microstructural constituents, as well as the mutual effect of these constituents as an aggregate. To this end, we systematically studied the local mechanical properties and deformation mechanisms of the microstructural constituents in a ZnAl4Cu1Mg0.31 alloy using nanoindentation tests at room temperature (25 degrees C) and 85 degrees C. The obtained strain rate sensitivity and activation volume suggest dislocation-dominated deformation in the primary eta-Zn phase and grain/phase boundary sliding in the eutectoid structures.Further, the strain partitioning between individual microstructural constituents and their roles on macroscopic deformation at 85 degrees C was investigated using quasi in-situ digital image correlation (DIC), supplemented with non-rigid image registration. The DIC measurements showed that eutectic and eutectoid colonies carry higher strain than the primary eta-Zn phase grains. The presented approaches and results can therefore be used to design new Zn-Al alloys and also other multiphase alloys with improved mechanical properties. (C) 2018 Elsevier Ltd. All rights reserved.