退火温度对7005铝合金力学性能与显微组织的影响
Effects of Annealing Temperature on Microstructure and Mechanical Properties of 7005 Al Alloy
郝 勇, 史庆南, 陈家欣
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作者单位：(昆明理工大学 材料科学与工程学院, 云南 昆明 650093)
中文关键字：7005铝合金； 退火温度； 再结晶温度； 断口形貌
英文关键字：7005 Al alloy; annealing temperature; recrystallization temperature; fracture surface
中文摘要：采用电子万能试验机、金相显微镜、显微硬度测试和扫描电镜(SEM)观察等手段，对不同退火温度下7005高强铝合金的力学性能、显微组织及硬度等进行了分析研究。结果表明，随退火温度的升高，铝合金抗拉强度和硬度明显下降，断后伸长率呈线性增长，达到再结晶温度450 ℃后性能趋于稳定。力学性能的变化与组织均匀性的变化相关。分析拉伸断口形貌，主要由韧窝和撕裂棱组成，属韧性断裂。
英文摘要：The mechanical properties, microstructure and hardness of 7005 high strength Al alloy annealled at different temperature were analyzed using mechanical property testing machine, metallographical microscope, microhardness testing machine and SEM. The results show that the tensile strength and hardness of 7005 Al alloy declines with the increase of annealing temperature, the elongation is growing in linear. When recrystallization temperature reaches 450 ℃, the properties turn out to be stable. The change of mechanical properties is related to microstructure uniformity. Tensile fracture surface is mainly composed of ductile dimples and tearing edges, presents ductile fracture.