Microstructure evolution during superplastic deformation process and its impact on superplastic behavior of a Mg-Gd-Y-Zn-Zr alloy
Microstructure evolution during superplastic deformation process and its impact on superplastic behavior of a Mg-Gd-Y-Zn-Zr alloy
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Mg-Gd-Y-Zn-Zr合金超塑性变形过程中的微观组织演变及其对超塑性行为的影响
DOI：
10.1016/j.matchar.2021.110879
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发表时间：
2021-02
影响因子：
4.7
通讯作者：
Shaosong Jiang
中科院分区：
文献类型：
--
作者：
Chao Sun;Huan Liu;Xiaojun Wang;Xiaoshi Hu;Shaosong Jiang
通过对比高温拉伸前后的显微组织，研究了峰值时效变形镁-10Gd-3Y-1.5Zn-1Zr(wt%)合金在超塑性变形过程中的组织演变及其对超塑性行为的影响。结果表明，除400℃、应变速率为1×10−3S−1的变形样品外，其余样品在400℃~475℃、应变速率为1×10−3S−1~5 0×10−3S−1范围内变形时均表现出超塑性，其主要超塑性变形机制为晶界扩散控制的晶界滑移。此外，与峰时效态合金相比，高温转变后合金组织发生了三个主要变化，即：Mg3Gd相的消失，Mg24Y5相的出现，以及不同体积分数的14H长周期有序相(LPSO)的出现。当变形温度为450℃，应变速率为5×10−3S−1时，该合金获得了最高的超塑性伸长率(972%)。这是由于析出了大量的14H LPSO相和Mg24Y5相，以及Mg24Y5相的碎裂，延缓了晶界的分离，提高了显微组织容纳更多位错的能力。
In this work, the microstructure evolution during superplastic deformation process and its impact on superplastic behavior of a peak-aged wrought Mg-10Gd-3Y-1.5Zn-1Zr (wt%) alloy were investigated by comparing the microstructure before and after high temperature tensile test (HTTT). The results show that except for the sample deformed at 400 °C with the strain rate of 1 × 10−3s−1, all the other samples exhibit superplasticity when deformed at temperatures between 400 °C and 475 °C with the strain rate from 1 × 10−3s−1to 5 × 10−3s−1. The dominant superplastic deformation mechanism of the alloy is grain boundary sliding (GBS) controlled by grain boundary (GB) diffusion. In addition, three main changes of the microstructure are confirmed after HTTT compared with the peak-aged alloy, i.e., the disappearance of the Mg3Gd phase, the emergence of the Mg24Y5phase, and the various volume fraction of 14H long period stacking ordered (LPSO) phase. Moreover, when deformed at 450 °C with the strain rate of 5 × 10−3s−1, this alloy obtains the highest superplastic elongation (972%). This is due to the largest number of precipitated 14H LPSO and Mg24Y5phases, as well as the fragmentation of the Mg24Y5particles, which can delay the grain boundaries separation and improve the ability of the microstructure to accommodate more dislocations.
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