A study of precipitation behavior of cast Mg-3Zn-0.5Cu-0.6Zr magnesium alloy

作者：Li, Ai-Wen; Liu, Jiang-Wen; Wu, Cui-Lan; Luo, Cheng-Ping^*; Jiao, Dong-Ling; Zhu, Hong-Mei

来源：Materials Science and Technology, 2010, 18(6): 883-888.

• As cast alloy
• Base plane
• CuMgZn
• Mg matrix
• MgZn
• Non-equilibrium eutectic
• Precipitation behavior
• Solution treatments

The types and nature morphologies of precipitates in as-cast and aged Mg-3Zn-1.5Cu-0.6Zr magnesium alloy were studied. The microstructure of the as-cast alloy was composed of Mg matrix and nonequilibrium eutectic (Mg+Mg2Cu, CuMgZn) formed at grain boundaries, and most of the nonequilibrium eutectic were dissolved after solution treatment at 440°C. Three types of precipitates were found after aging at 180°C for 20 h. The first type (lath-like) was MgZn2 with length of 50~200 nm and very high density, which was perpendicular to the base plane of the Mg matrix and primarily responsible for the hardening of the alloy. The second type (lath-like or neddle-like) was MgZn with length of about 50~150 nm, which was parallel to the base plane. The third one (plate-like) was MgZn2 with length of about 50~100 nm, which was also parallel to the base plane.

• 出版日期2010-12
• 单位华南理工大学