Microstructure and Mechanical Properties of Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr Alloy

作者：Yuan Ming^*; Zheng Ziqiao

来源：Rare Metal Materials and Engineering, 2014, 43(11): 2787-2791.

• Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr alloy
• solution heat treatment
• microstructure
• mechanical property
• precipitation sequences

The microstructure and mechanical properties of high performance Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr (wt%) alloy were investigated. The alloy was mainly composed of alpha-Mg and (Mg,Zn)(3)(Sm,Gd)(1) eutectic phase in as-cast state. After the solution treatment at 510 degrees C for 4 h and subsequent aging at 200 degrees C, the alloy exhibits remarkable mechanical properties. The precipitation sequences observed during aging at 200 degrees C are Mgssss ->beta ''(D019)->beta'(bct)->beta(fcc). The ultimate tensile strength, yield strength and elongation of the alloy at peak-aged state are 282 MPa, 185 MPa and 6.1% at room temperature, respectively. The good mechanical properties are mainly attributed to the fine microstructure and fine metastable phase precipitates in the matrix during aging at 200 degrees C for 32 h.

• 出版日期2014-11
• 单位中南大学