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对模压态AZ61镁合金在室温～150℃条件下的的力学性能及变形机制进行研究。结果表明:在拉伸速度1 mm/min,随着拉伸温度的升高,拉伸后的显微组织中晶界逐渐软化,动态再结晶有减少趋势,并伴随有孪晶出现,抗拉强度及屈服强度显著下降,而其伸长率在低温拉伸中的变化幅度有限;同时在90～130℃发生了动态应变时效;对拉伸断口的观察分析表明,随着温度的逐渐升高(≤150℃),其断裂机制由韧脆混合断裂逐渐变为韧性断裂。
The mechanical properties and deformation mechanism of AZ61 magnesium alloy under the condition of room temperature ~ 150 ℃ were studied. The results show that the grain boundary in the stretched microstructure softens gradually with the increase of the stretching temperature at a tensile speed of 1 mm / min, and the dynamic recrystallization tends to decrease with the occurrence of twins, Strength and yield strength decreased significantly, while the rate of elongation in the low-temperature tensile changes in the limited range; at the same time at 90 ~ 130 ℃ occurred dynamic strain aging; tensile fracture analysis showed that as the temperature gradually increased (≤150 ℃), the fracture mechanism gradually changed from ductile-brittle fracture to ductile fracture.