Creep behaviour of eutectic Zn-Al-Cu-Mg alloys
Creep behaviour of eutectic Zn-Al-Cu-Mg alloys
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DOI：
10.1016/j.msea.2018.03.068
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发表时间：
2018-05
期刊：
影响因子：
6.4
通讯作者：
Zhicheng Wu;S. Sandlöbes;Yufeng Wang;J. Gibson;S. Korte-Kerzel
中科院分区：
文献类型：
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作者：
Zhicheng Wu;S. Sandlöbes;Yufeng Wang;J. Gibson;S. Korte-Kerzel
在这项研究中，我们研究了三种不同Mg含量的共晶ZnAl4Cu1Mg合金的蠕变行为，即ZnAl4Cu1Mg0.04, ZnAl4Cu1Mg0.21和ZnAl4Cu1Mg0.31 (wt%)，采用单轴拉伸蠕变试验，温度在25 °C和105 °C之间。在室温（25 °C）和85 °C条件下，通过纳米压痕蠕变实验研究了ZnAl4Cu1Mg0.31合金各显微组织组分的蠕变特性。Mg含量的增加使ZnAl4Cu1合金的蠕变速率加快。Zn-Al共晶和共晶组织的抗蠕变性能低于η-Zn基体相。单轴试验得到的应力指数为6.9 ~ 8.0，蠕变激活能为93 ~ 104 kJ/mol，表明位错控制蠕变。
In this study we investigated the creep behaviour of three eutectic ZnAl4Cu1Mg alloys with different Mg contents, namely ZnAl4Cu1Mg0.04, ZnAl4Cu1Mg0.21 and ZnAl4Cu1Mg0.31 (in wt%), using uniaxial tensile creep tests at temperatures between 25 °C and 105 °C. Furthermore, we studied the creep properties of the individual microstructural constituents of the ZnAl4Cu1Mg0.31 alloy using nanoindentation creep experiments at room temperature (25 °C) and 85 °C. Increasing Mg content causes an acceleration of the creep rate of ZnAl4Cu1 alloys. Zn-Al eutectic and eutectoid structures show a lower creep resistance than the η-Zn matrix phase. Stress exponents of 6.9–8.0 and creep activation energy values of 93–104 kJ/mol are obtained during the uniaxial tests, which suggests dislocation controlled creep.