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采用铸锭冶金法制备高Zn(质量分数为10.8%)7075铝合金,用金相显微镜、扫描电镜和能谱等分析了提高Zn含量后7075铝合金显微组织的变化,并研究了不同回归热处理对该合金力学性能的影响。结果表明,Zn质量分数提高到10.8%时,合金晶粒细化,在T6状态下,合金抗拉强度达到650 MPa,屈服强度为620 MPa,较常规7075铝合金分别提高了10.2%和13.8%,但伸长率仅为2.8%;含10.8%Zn的7075铝合金经优化回归热处理(120℃×12 h+190℃×10 min+120℃×16 h)后,抗拉强度为714 MPa,屈服强度为690 MPa,伸长率为8.3%,较T6状态分别提高了9.8%、11.3%及196%。
High quality Zn (mass fraction 10.8%) 7075 aluminum alloy was prepared by ingot metallurgy. The microstructure of 7075 aluminum alloy was analyzed by metallographic microscope, scanning electron microscopy and energy spectrum. The effects of different regressions Effect of heat treatment on the mechanical properties of the alloy. The results show that when the mass fraction of Zn is increased to 10.8%, the grain size of the alloy is refined. Under the T6 condition, the tensile strength of the alloy reaches 650 MPa and the yield strength is 620 MPa, which increases by 10.2% and 13.8% respectively compared with the conventional 7075 aluminum alloy. , But the elongation was only 2.8%. The tensile strength of 7075 aluminum alloy with 10.8% Zn was 714 MPa after optimized regression heat treatment (120 ℃ × 12 h + 190 ℃ × 10 min + 120 ℃ × 16 h) The yield strength was 690 MPa and the elongation was 8.3%, which was 9.8%, 11.3% and 196% higher than that of T6 respectively.