Effects of Zn Addition on the Microstructure and Mechanical Properties of As-Extruded Mg-2Al-0.5Ca Alloy
Effects of Zn Addition on the Microstructure and Mechanical Properties of As-Extruded Mg-2Al-0.5Ca Alloy
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DOI：
10.3390/met12020221
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发表时间：
2022-01
期刊：
影响因子：
2.9
通讯作者：
M. Yuan;Chao He;Yan Song;B. Lei;Xiaoying Qian;Zhihua Dong;J. Zhao;Huabao Yang;Yanfu Chai-Yanfu
中科院分区：
文献类型：
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作者：
M. Yuan;Chao He;Yan Song;B. Lei;Xiaoying Qian;Zhihua Dong;J. Zhao;Huabao Yang;Yanfu Chai-Yanfu
研究了Zn添加量对Mg-2Al-0.5Ca-xZn（x = 0、0. 3、0. 6、0. 9 wt.%）合金挤压态组织和力学性能的影响。合金在这项工作中进行了研究。结果表明，Zn元素的加入使挤压板材呈现完全动态再结晶组织，晶粒尺寸得到细化，同时由于Zn原子在晶界上的偏聚，抑制了动态再结晶晶粒的长大，导致织构弱化。添加0.6wt.% Zn提高了挤压态Mg-2Al-0.5Ca合金的抗拉强度和塑性。挤压态Mg-2Al-0.5Ca-0.6Zn合金的0.2%屈服强度为145 MPa，极限抗拉强度为317 MPa，沿挤压方向的延伸率为30.0%沿着。强度和塑性的同时提高主要是由于细小均匀的晶粒组织和弱化的挤压方向（艾德）倾斜织构。挤压态Mg-2Al-0.5Ca-0.6Zn合金表现出很小的面内各向异性拉伸性能，其0.2%屈服应力、极限抗拉强度和45°方向延伸率分别为148 MPa、299 MPa和25.0%，横向延伸率分别为148 MPa、269 MPa和16.8%。
The effects of Zn addition on the microstructure and tensile properties of as-extruded Mg-2Al-0.5Ca-xZn (x = 0, 0.3, 0.6, 0.9 wt.%) alloys were investigated in this work. The results showed that the extruded sheets exhibited a completely dynamically recrystallized microstructure, the grain size was refined, and texture weakening was achieved with Zn addition because of the segregation of Zn atoms on grain boundaries, which suppresses the growth of dynamic recrystallized grains. The addition of 0.6 wt.% Zn improved both the tensile strength and ductility of the as-extruded Mg-2Al-0.5Ca alloy. The as-extruded Mg-2Al-0.5Ca-0.6Zn alloy showed a 0.2% proof stress of 145 MPa, an ultimate tensile strength of 317 MPa, and an elongation of 30.0% along the extruded direction. The simultaneous improvement of strength and ductility was mainly due to the fine and homogeneous grain microstructure and the weakened extrude direction (ED)-tilted texture. The as-extruded Mg-2Al-0.5Ca-0.6Zn alloy showed little in-plane anisotropic tensile properties, with a 0.2% proof stress, ultimate tensile strength, and elongation in the 45° direction of 148 MPa, 299 MPa, and 25.0%, and those in the transverse direction of 148 MPa, 269 MPa, and 16.8%, respectively.