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研究了热轧态的Zn-5％Al共晶合金超塑性变形的力学行为及其显微组织的变化。结果表明:温度和应变速率对合金超塑性的力学性能影响很大。由于Zn-5％Al共晶合金具有优良的稳定组织,其最佳超塑性出现在较高的温度(300℃)和中等应变速率(1.67×10~(-4)s~(-1))条件下。随着温度提高到340℃,热长大已成为晶粒长大的主要因素。提高变形温度(300℃),可以使Zn-5％Al合金以较小的应力(25 MPa)和较高的应变速率(1.67×10~(-2)s~(-1))超塑性变形。
The mechanical behavior and microstructure changes of superplastic deformation of hot-rolled Zn-5% Al eutectic alloy were studied. The results show that the temperature and strain rate have a great influence on the mechanical properties of the alloy superplasticity. The best superplasticity of Zn-5% Al eutectic alloy appeared at higher temperature (300 ℃) and medium strain rate (1.67 × 10 -4 s -1) because of its excellent stable structure. Condition. As the temperature increases to 340 ℃, thermal growth has become a major factor in grain growth. Increasing the deformation temperature (300 ℃) can superplastically deform the Zn-5% Al alloy with a smaller stress (25 MPa) and a higher strain rate (1.67 × 10 -2 s -1) .