Effect of Two-Stage Solid Solution Treatment on Microstructure and Mechanical Properties of Mg-4Nd-1Gd-0.3Zn-0.6Zr Alloy
The effects of two-stage solution temperature and time on the microstructure and mechanical properties of Mg-4Nd-1Gd-0.3Zn-0.6Zr magnesium alloy were studied by OM,SEM,TEM and an electronic universal testing machine.The results showed that the microstructure of the as-cast alloy was mainly composed of α-Mg matrix and eutectic Mg12Nd on the grain boundary.After different two-stage solid solution treatments,the microstructure of the alloy was composed of α-Mg matrix,Mg12Nd,and aging precipitates β'phase.When the two-stage solution system was 500 ℃ ×20 h+540 ℃ ×10 h,the comprehensive mechanical properties of the alloy was optimal.The tensile strength of the alloy was 268.65 MPa,the yield strength was 171.28 MPa,and the elongation was 3.33％.The main fracture mode of the alloy was mixed fracture.
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