Enhanced superplasticity in friction stir processed Mg–Gd–Y–Zr alloy
Enhanced superplasticity in friction stir processed Mg–Gd–Y–Zr alloy
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DOI：
10.1016/j.jallcom.2012.10.002
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发表时间：
2013-02
影响因子：
6.2
通讯作者：
Qunbao Yang;B. Xiao;Z. Ma
中科院分区：
文献类型：
--
作者：
Qunbao Yang;B. Xiao;Z. Ma
采用搅拌摩擦工艺（FSP）制备了以大角度晶界（HAGB）为主的细晶过饱和Mg-10 Gd-3 Y-0. 5 Zr（GW 103）合金。在400-425°C的小温度范围内对FSP GW 103合金进行超塑性研究。在超塑变形前的加热过程中，在晶界处析出细小的β-Mg 5（Gd，Y）颗粒，其体积分数随温度从400 ° C升高到425°C显著降低。FSP GW 103合金的超塑性对试验温度敏感，在1×10−3s− 1、中温415°C时，合金的超塑性达到最大值1110%。晶界滑移是FSP GW 103合金的主要变形机制。高的超塑性归因于细晶粒、高百分比的HAGB和在415°C下析出的中等体积分数的β颗粒。
Fine-grained supersaturated Mg–10Gd–3Y–0.5Zr (GW103) alloy with predominant high-angle grain boundaries (HAGB) was prepared by friction stir processing (FSP). The FSP GW103 alloy was subjected to superplastic investigation at a small temperature range of 400–425°C. Fine β-Mg5(Gd,Y) particles precipitated at the grain boundaries during heating before superplastic deformation, and their volume fraction decreased significantly with increasing the temperature from 400 to 425°C. Superplasticity of the FSP GW103 alloy was sensitive to the testing temperature, and a maximum superplasticity of 1110% was achieved at 1×10−3s−1and a medium temperature of 415°C. Grain boundary sliding was identified as the main deformation mechanism in FSP GW103 alloy. The high superplasticity is attributed to the fine grains, high percentage of HAGBs, and a moderate volume fraction of β particles that precipitated at 415°C.