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通过金相显微镜,扫描电镜,能谱(EDS)分析仪对含Sc的7075铝合金的组织结构进行了分析,并研究了其力学性能。结果表明:含0.22%Sc的7075铝合金经过优化回归热处理(120℃×16 h+160℃×15 min+120℃×16 h)后,合金的力学性能得到了显著提高。测得合金的抗拉强度、规定塑性延伸强度及伸长率分别为714 MPa、645 MPa和10.8%,较T6时效分别提高了18.2%、14%和6.5%。
The microstructures of 7075 aluminum alloy containing Sc were analyzed by metallographic microscope, scanning electron microscope and energy dispersive spectrometer (EDS), and its mechanical properties were studied. The results show that the mechanical properties of 7075 aluminum alloy containing 0.22% Sc are improved significantly by optimized regression heat treatment (120 ℃ × 16 h + 160 ℃ × 15 min + 120 ℃ × 16 h). The tensile strength of the alloy was measured. The tensile strength and elongation at break were 714 MPa, 645 MPa and 10.8%, respectively, which were 18.2%, 14% and 6.5% higher than those of T6.