退火温度对Mg-1Zn-0.6Zr-2Y合金组织和力学性能的影响

Effects of Annealing Temperature on Microstructure and Mechanical Properties of Mg-1Zn-0.6Zr-2Y Alloy

对挤压态Mg-1Zn-0.6Zr-2Y合金进行300~390℃的退火试验。采用金相显微镜、扫描电镜、万能试验机等研究了不同温度退火对Mg-1Zn-0.6Zr-2Y合金组织和力学性能的影响。结果表明:随着退火温度的升高,Mg-1Zn-0.6Zr-2Y合金的晶粒先增大后减小,均匀性逐渐提高,390℃退火合金试样发生了完全再结晶,晶粒均匀细小。随着退火温度的升高,合金的抗拉强度和伸长率先降低后升高,390℃退火合金试样的抗拉强度和伸长率均达到最大值,分别为366.4 MPa和30.8%,比挤压态试样分别提高了9.3%和21.7%。

The extruded Mg-1Zn-0.6r-2Y alloy was annealed at 300-390 ℃. The effects of different annealing temperatures on the microstructure and mechanical properties of Mg-1Zn-0.6r-2Y alloy were studied by means of metallographic microscope, scanning electron microscope and universal testing machine. The results show that with the increases of annealing temperature, the grain size of Mg-1Zn-0.6r-2Y alloy first increases and then decreases, and the homogeneity gradually increases. The sample annealed at 390 ℃ has completely recrystallized and the grain size is even and fine. With the increase of annealing temperature, the tensile strength and elongation of the alloy first decrease and then increase. The tensile strength and elongation of the alloy samples annealed at 390 ℃ reach the maximum value, which are 366.4 MPa and 30.8% respectively, which are 9.3% and 21.7% higher than that of the extrusion state.