ZK60-xY合金的微观组织和力学性能研究

以ZK60为基础合金, 研究了不同钇添加量对其组织性能的影响。显微组织分析结果表明: 钇有明显细化晶粒的作用, 合金在热挤压过程中发生了动态再结晶。力学测试结果表明, 经过热挤压和T₅(人工时效)处理后, Y含量为0.9%的合金具有最优的综合力学性能, 其抗拉强度和延伸率分别为: σ_b=355.94 MPa, δ=15.86%。对该合金分别进行T₆(固溶+时效)和T₅ 2种热处理后进行力学性能测试, 结果表明:T₅处理制度更适用于该合金。

A Research of Microstructures and Mechanical Properties of ZK60-xY Alloys

Taking ZK60 alloy as a master alloy, a research was made on the influence of Y content on the microstructures and mechanical properties of the investigated alloys. The results of microstructure analysis show that Y has an obvious effect of refining crystal grains. During the course of extrusion, dynamic re-crystallization accompanied by phase transformation occurs in the alloys. After extrusion and aging treatment, the alloy with 0.9%Y gets the best comprehensive mechanical properties with a tensile strength of 355.94 MPa and an elongation of 15.86%. The alloy was treated by two ways of T₆ (solution treatment at 430 ℃ for 5 hrs + aging at 150 ℃ for 22 hrs) and T₅ (aging at 150 ℃ for 24 hrs) respectively. The mechanical test results show that T₅ treatment is more suitable for the alloy.