Precipitation of Secondary Phase in Mg-Zn-Gd Alloy After Room-Temperature Deformation and Annealing
Precipitation of Secondary Phase in Mg-Zn-Gd Alloy After Room-Temperature Deformation and Annealing
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Mg-Zn-Gd合金室温变形和退火后第二相的析出
DOI：
10.1016/j.jmrt.2017.04.006
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Zhongchang Wang
中科院分区：
文献类型：
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作者：
Hua Huang;Hongwei Miao;Guangyin Yuan;Chunlin Chen;Zhongchang Wang
准晶增强Mg-Zn-RE合金由于具有优异的力学性能平衡性而得到广泛的研究。在此，我们对Mg-1.50Zn-0.25Gd（at.%）合金进行了形变和退火处理。合金在不同的温度，旨在获得纳米级的沉淀。我们发现，在室温压缩后，非基底位错，堆垛层错和孪晶被确定在变形的样品中，提供明确的证据，这些变形机制可以容纳室温变形。我们还进行了系统的透射电子显微镜观察变形和退火样品中的沉淀物。结果表明，在200 °C退火时形成大量的第二相沉淀物，即I相和MgZn 2，在400 °C退火时析出少量的W相。
Mg-Zn-RE alloys reinforced with quasicrystals have been investigated extensively because they show excellent balance in mechanical properties. Here, we perform deformation and annealing for Mg-1.50Zn-0.25Gd (at.%) alloy at various temperatures, aimed to gain nanoscale precipitates. We find that after the room-temperature compression, the non-basal dislocation, stacking fault and twining are identified in the as-deformed samples, offering clear evidence that these deformation mechanisms can accommodate room-temperature deformation. We also perform systematic transmission electron microscopy observations of the precipitates in both the as-deformed and as-annealed samples. The results identify the formation of a large amount of secondary-phase precipitates, I-phase and MgZn2, when annealed at 200 °C, and precipitation of a small amount of W-phase when annealed at 400 °C.