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通过对挤压态AZ61镁合金进行热锻及随后的人工时效处理,分析了人工时效及形变对AZ61镁合金微观组织和力学性能的影响。结果表明:不同的时效温度下随时间的延长,合金的硬度先升高,到达一峰值时开始下降。在相同时效时间条件下,随时效温度的升高,硬度逐渐增高,达极大值之后又降低。180℃是AZ61镁合金最佳的时效温度,并且在时效27 h时强度和硬度达到最大值,分别为σb=324.18 MPa,σ0.2=290.53 MPa,硬度为78.5 HRE,δ=13.21%。同时,人工时效β-Mg17Al12相的析出使AZ61镁合金得到强化。
The effect of artificial aging and deformation on the microstructure and mechanical properties of AZ61 magnesium alloy was analyzed by hot forging and subsequent artificial aging treatment on the extruded AZ61 magnesium alloy. The results show that the hardness of the alloy first increases with time under different aging temperature, and then begins to decrease when reaching a peak value. With the same aging time, with the aging temperature increases, the hardness gradually increased, reaching a maximum and then decreased. 180 ℃ is the best aging temperature of AZ61 magnesium alloy, and reaches the maximum value of strength and hardness at 27 h aging, respectively σ b = 324.18 MPa, σ 0.2 = 290.53 MPa, hardness 78.5 HRE, δ = 13.21%. At the same time, artificial aging β-Mg17Al12 phase precipitation AZ61 magnesium alloy is strengthened.