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采用力学性能测试、金相显微分析等方法,研究了热处理工艺条件变化对Al-Zn-Mg系合金组织和性能的影响,探索提高AlZn-Mg系合金综合力学性能的最佳热处理工艺参数。利用正交试验方法设计了热处理工艺方案。结果表明,Al-Zn-Mg系7075合金的最佳热处理工艺制度为470℃×1 h固溶+130℃×24 h预时效+40%热变形+120℃×16 h终时效。经该工艺处理后,7075合金晶粒均匀细化,再结晶程度较高,且可见明显的析出相。强度达到683 MPa,硬度达到87.2 HRB,伸长率达到16.8%。
The mechanical properties and metallographic analysis were used to study the effect of heat treatment process on the microstructure and properties of Al-Zn-Mg alloy. The optimum parameters for improving the mechanical properties of AlZn-Mg alloy were explored. Orthogonal experimental design method of heat treatment process. The results show that the optimum heat treatment process of Al-Zn-Mg system 7075 alloy is 470 ℃ × 1 h solid solution + 130 ℃ × 24 h pre-aging + 40% thermal deformation + 120 ℃ × 16 h final aging. After the process, the 7075 alloy grain refinement, recrystallization degree is higher, and the obvious precipitation phase. The strength reaches 683 MPa, the hardness reaches 87.2 HRB and the elongation reaches 16.8%.