Enhanced strength and corrosion resistant of Mg-Gd-Y-Al alloys by LPSO phases with different Al content
Enhanced strength and corrosion resistant of Mg-Gd-Y-Al alloys by LPSO phases with different Al content
复制标题
不同Al含量LPSO相提高Mg-Gd-Y-Al合金的强度和耐蚀性
DOI：
10.1016/j.jallcom.2021.160557
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发表时间：
2021-07-02
影响因子：
6.2
通讯作者：
Ma, Kai
中科院分区：
文献类型：
--
作者：
Su, Chen;Wang, Jingfeng;Ma, Kai
本研究研究了 Mg-8.5Gd-5Y-xAl (x=0.2、0.5、0.8 和 1.1 wt%) 合金的显微组织、力学性能、阻尼能力和腐蚀性能。结果表明，合金主要由长周期堆垛有序(LPSO)相、Mg-RE相、Al-RE相和镁(Mg)基体组成。随着Al含量的增加，LPSO相减少。挤压后，Mg-8.5Gd-5Y-0.2Al表现出最好的力学性能和阻尼性能，其抗拉强度为376 MPa，屈服强度为263 MPa，伸长率为13%，应变为1x10(-3)时Q(-1)为0.0132。腐蚀特性还表明，随着Al含量的增加，腐蚀速率增加。 Mg-8.5Gd-5Y-0.2Al的最低腐蚀速率为3.80 mm/年，最低腐蚀电流密度为2.81x10(-5) A/cm(2)。 LPSO相可以同时增强机械性能和耐腐蚀性能。 (C) 2021 Elsevier B.V. 保留所有权利。
The microstructure, mechanical properties, damping capacities and corrosion properties of Mg-8.5Gd-5Y-xAl (x=0.2, 0.5, 0.8 and 1.1 wt%) alloys were investigated in this study. The results revealed that the alloys were mainly composed by long period stacking ordered(LPSO) phase, Mg-RE phase, Al-RE phase and magnesium(Mg) matrix. With the increase of Al content, the LPSO phase decreases. After extrusion, Mg-8.5Gd-5Y-0.2Al shows the best mechanical properties and damping performance, with the tensile strength of 376 MPa, yield strength of 263 MPa, elongation of 13%, the Q(-1) is 0.0132 when the strain is 1x10(-3). The corrosion properties also show that with the Al content increasing, the corrosion rate increases. Mg-8.5Gd-5Y-0.2Al shows the lowest corrosion rate of 3.80 mm per year and the lowest corrosion current density of 2.81x10(-5) A/cm(2). The LPSO phase can enhance the mechanical properties and corrosion resistance at same time. (C) 2021 Elsevier B.V. All rights reserved.