热处理对挤锻复合成形AZ61镁合金组织与性能的影响
Influence of Heat Treatment on Microstructure and Mechanical Property of Extrusion-forging AZ61 Alloy
徐绍勇, 龙思远, 曹凤红
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作者单位：(重庆大学 材料科学与工程学院, 重庆 400030)
中文关键字：挤压态AZ61镁合金； 热模锻； 人工时效； 显微组织； 力学性能
英文关键字：extruded AZ61 alloy; hot forging; artificial aging; microstructure; mechanical property
中文摘要：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。
英文摘要：The microstructure and mechanical properties of extruded AZ61 alloy after hot forging and succedent artificial aging heat treatment were investigated. The results show that, at different aging temperature, with the increase of holding time, the hardness of the alloy increases then begins to decrease when the hardness is up to peak value. However, with the increase of aging temperature, the hardness gradually increases, while reaching a maximum value then begins to decrease. The best aging temperature of the AZ61 alloy is 180 ℃. The ultimate tensile strength of AZ61 alloy aging at 180 ℃ for 27 h is about 324.18 MPa, the yield strength about 290.53 MPa, the hardness about 78.5 HRE and the elongation about 13.21%. Meanwhile, the precipitation of β-Mg17Al12 at the process of artificial aging makes AZ61 alloy reinforce.