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采用铸锭冶金法制备了Er含量为0.30%的7075铝合金,用金相显微镜、扫描电镜和能谱分析等分析了Er的加入和回归热处理工艺对合金显微组织的影响,并研究了其力学性能。结果表明,加入Er后合金晶粒明显细化,T6状态下合金抗拉强度为585MPa,屈服强度为528MPa,伸长率为8.5%,质量系数为724,较不含Er的合金分别提高了2.63%、2.33%、21.43%和3.87%;含Er的合金经优化后的回归热处理(120℃×16h+180℃×10min+120℃×16h)后,抗拉强度为645MPa,屈服强度为603MPa,伸长率为11%,质量系数为801,较T6状态下含Er合金提高了10.26%、14.20%、29.41%和10.64%。
The 7075 aluminum alloy with 0.30% Er content was prepared by ingot metallurgy. The effects of Er addition and regression heat treatment on the microstructure of the alloy were analyzed by metallographic microscope, scanning electron microscopy and energy spectrum analysis. Mechanical properties. The results show that the grain size of the alloy is obviously refined after adding Er, the tensile strength of the alloy is 585MPa, the yield strength is 528MPa, the elongation is 8.5%, the mass coefficient is 724, the alloy without Er is increased by 2.63 %, 2.33%, 21.43% and 3.87% respectively. After the optimized heat treatment (120 ℃ × 16h + 180 ℃ × 10min + 120 ℃ × 16h), the tensile strength and the yield strength of Er- The elongation is 11% and the mass coefficient is 801, which is 10.26%, 14.20%, 29.41% and 10.64% higher than that of the T6 containing Er alloy.