Superplasticity of Mg–Zn–Y alloy containing quasicrystal phase processed by equal channel angular pressing
Superplasticity of Mg–Zn–Y alloy containing quasicrystal phase processed by equal channel angular pressing
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DOI：
10.1016/j.matlet.2007.02.013
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发表时间：
2007-09
影响因子：
3
通讯作者：
M. Zheng;Shen Xu;K. Wu;S. Kamado;Y. Kojima
中科院分区：
文献类型：
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作者：
M. Zheng;Shen Xu;K. Wu;S. Kamado;Y. Kojima
对铸态Mg-4.3wt.%的镁合金进行了等通道转角挤压（ECAP）Zn-0.7重量%在623 K下，Y-Mg合金中含有准晶相.经过8道次ECAP变形后，铸态合金的晶粒尺寸从120 μm减小到3.5 μm，粗大的共晶准晶相被破碎并弥散分布在合金中。在523 K和623 K温度下，以1.5×10− 3 ~ 1.5×10−4s−1的初始应变速率对ECAP处理的Mg-Zn-Y合金进行了拉伸试验。当在623 K下使用1.5×10−4s−1的初始应变速率进行测试时，ECAP合金表现出约600%的最大伸长率。晶界滑移被认为是Mg-Zn-Y合金在所研究的温度和应变速率范围内的主要变形机制。
Equal channel angular pressing (ECAP) has been conducted on as-cast Mg–4.3 wt.%Zn–0.7 wt.%Y Mg alloy containing quasicrystal phase at a temperature of 623 K. After 8 ECAP passes, the grain size of the as-cast alloy is decreased from ∼120 to ∼3.5 μm, and the coarse eutectic quasicrystal phases are broken and dispersed in the alloy. Tensile testing has been performed on the ECAPed Mg–Zn–Y alloy at temperatures of 523 K and 623 K with initial strain rates from 1.5×10−3to 1.5×10−4s−1. The ECAPed alloy exhibits a maximum elongation of about 600% when testing at 623 K using an initial strain rate of 1.5×10−4s−1. Grain boundary sliding is considered to be the dominant deformation mechanism of the Mg–Zn–Y alloy in the temperature and strain-rate range investigated.