(北华大学 机械工程学院， 吉林 132021)
摘 要: 通过测试抗拉强度的自然时效、人工时效曲线，采用光学显微镜、透射电镜及扫描电镜的观察，研究了微量La对Zn-22%Al减振合金显微组织和力学性能的影响。结果表明：La具有细化Zn-22%Al合金的组织并阻碍时效时晶粒长大和等轴程度降低的作用; 在低于温轧温度(80 ℃)下时效时，加La和不加La的Zn-22%Al合金的室温力学性能保持不变; La可提高Zn-22%Al合金的强度以及时效时力学性能的稳定性。
关键字: La； Zn-22%Al合金； 时效； 显微组织； 力学性能
mechanical properties of
Zn-22%Al vibration damping alloy
（School of Mechanical Engineering,
Beihua University, Jilin 132021, P.R.China）
Abstract:The effects of La on microstructures and mechanical properties of Zn-22%Al vibration alloy have been studied by measuring the curves of tensile strength versus natural ageing and artificial ageing time and by means of OM, TEM and SEM. The results show that La can refine the microstructure of Zn-22%Al alloy, slow down the grain growth and reduce the equiaxial degree during ageing, that the strength of Zn-22%Al-(La)alloys and Zn-22%Al alloy remains constant after ageing below the warm-rolling temperature, and that La can improve the strength and the stability of mechanical properties of Zn-22%Al alloy.
Key words: La； Zn-22%Al alloy； ageing； microstructures； mechanical properties
