Title£º Influence of Ca addition on microstructure, mechanical properties and corrosion behavior of Mg-2Zn alloy
Author£º *Hong-xiang Li1, Shi-kai Qin1, Chang-lin Yang2, Ying-zhong Ma1, Jian Wang1, Yun-jin Liu1, and Ji-shan Zhang1
Address£º 1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory of Solidifi cation Processing, Northwestern Polytechnical University, Xi¡¯an 710072, China
Key words£º magnesium alloys; Mg-Zn-Ca; microstructure; mechanical properties; corrosion behaviors
CLC Nmuber£º TG146.22
Document Code£º A
Article ID£º 1672-6421(2018)05-363-09

The microstructure, mechanical properties and corrosion behaviors of as-cast ternary Mg-2Zn-xCa(x=0, 0.2, 0.4, 0.8) alloys have been investigated in this study. Results indicate that the microstructure of Mg-Zn-Ca alloys can be signifi cantly refi ned with increasing Ca concentration. Moreover, the alloys with different contents ofCa exhibit the different phases formation behaviors, i.e. ¦Á-Mg + Ca2Mg6Zn3 phases for Mg-2Zn-0.2Ca and Mg-2Zn-0.4Ca alloys, and ¦Á-Mg + Ca2Mg6Zn3 + Mg2Ca phases for Mg-2Zn-0.8Ca alloy, respectively. Among all the alloys, the maximum ultimate tensile strength and elongation (161 MPa and 9.1%) can be attained for the Mg-2Zn 0.2Ca alloy. Corrosion tests in Hanks¡¯ balanced salt solution indicated that Ca addition is detrimental to corrosion resistance of Mg-2Zn alloy. The relationship between as-cast microstructure and properties for different Ca-containing alloys is also discussed in detail.