Effects of Cu and Zn on microstructures and mechanical behavior of the medium-entropy aluminum alloy
Effects of Cu and Zn on microstructures and mechanical behavior of the medium-entropy aluminum alloy
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DOI：
10.1016/j.jallcom.2019.153092
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发表时间：
2020-04-15
影响因子：
6.2
通讯作者：
Zhang, Yong
中科院分区：
文献类型：
--
作者：
Zhang, Bingbing;Liaw, Peter K.;Zhang, Yong
轻质合金变得越来越重要。以5083铝合金为研究对象，研究了Zn、Cu对5083铝合金组织、性能和锯齿行为的影响。结果表明，随着Zn含量的增加，合金的抗拉强度和屈服强度提高，而延伸率和锯齿幅度不断降低。此外，将不同量的Cu添加到高Zn含量的Al-Mg-6 wt.%（重量百分比）Zn合金，其中强度和塑性首先得到改善。当Cu含量为6wt%时，合金的延伸率约为7%，锯齿状行为逐渐消失。当合金成分为Al-Mg-6 wt.%时，合金的力学性能最佳Zn-6wt.% Cu.锯齿状行为被认为与运动位错和沉淀物之间的相互作用有关。在此基础上，采用改进的复合多尺度熵算法对锯齿流进行了分析。有人发现，锯齿的动态复杂性一般增加的溶质密度，应力降幅度，晶粒尺寸，拉伸和屈服强度，和塑性程度的增加。(C)2019爱思唯尔B. V.保留所有权利。
Lightweight alloys are becoming more and more important. Based on the 5083 aluminum alloy, the effects of Zn and Cu additions on the microstructures, properties, and serration behavior were investigated. The results show that with the increase of the Zn content, the tensile and yield strengths of the alloy increase, while the elongation and the serration amplitude keep on decreasing. Moreover, different amounts of Cu are added to the high Zn content Al-Mg-6 wt.% (weight percent) Zn alloy, in which the strength and plasticity are improved firstly. When the Cu content was 6 wt%, the elongation of the alloy is about 7%, and the serration behavior of the alloy gradually disappears. The optimal mechanical property is achieved at the composition of Al-Mg-6wt.%Zn-6wt.%Cu. The serration behavior is believed to be related to the interaction between the moving dislocations and the precipitates. Furthermore, the serrated flow was analyzed using the refined composite multiscale entropy algorithm. It was found that the dynamical complexity of the serrations generally increased with an increase in the solute density, the stress-drop magnitude, the grain size, the tensile and yield strengths, and the degree of plasticity. (C) 2019 Elsevier B.V. All rights reserved.