【摘要】 通过测试自然时效和人工时效的强度－时间关系曲线，以及采用金相显微镜、透射电镜和扫描电镜观察，探讨了微量锆对经８０℃轧制的Ｚｎ２２％Ａｌ合金显微组织和力学性能的影响。结果表明，在低于８０℃的温轧温度下时效时，加０．０８％～０．３２％Ｚｒ和不加Ｚｒ的Ｚｎ２２％Ａｌ合金的强度保持不变。锆具有细化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。锆还可提高Ｚｎ２２％Ａｌ合金的强度和时效时力学性能的稳定性。在三个不同含锆量的Ｚｎ２２％Ａｌ合金中，含０．１８％Ｚｒ的合金强度最高，而且最稳定。更多还原

【Abstract】 The effects of Zr on the microstructures and mechanical properties of the asrolled（80 ℃） Zn₂2%Al alloy have been studied by measuring the curves of tensile strength versus ageing time and by means of OM, TEM and SEM. The results show that the strength of Zn22%Al_{0.08%～0.32%}Zr alloys and Zn₂2%Al alloy remains constant after ageing below the warmrolling temperature（80 ℃）, that Zr can refine the microstructure of Zn₂2%Al alloy, slow the grain growth and reduce the equiaxial degree during ageing, and that Zr can improve the strength and the stability of mechanical properties of Zn₂2%Al alloy. It is found that the Zn22%Al₀.18%Zr alloy has the highest strength and is the most stable one among three Zn₂2%Al alloys tested with different Zr contents.更多还原