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采用铸锭冶金法制备了Al-0.9Mg-0.6Si-0.7Cu合金,通过电导率测试、显微组织观察、力学性能测试、XRD物相分析以及α(Al)基体点阵常数的计算等方法研究了固溶温度(525~570℃)对该合金微观组织、力学性能和断口形貌的影响。结果表明,实验合金最佳的固溶时效工艺为555℃×45 min固溶水淬,185℃×5.5 h时效;在此条件下,合金的抗拉强度、屈服强度、伸长率和电导率分别为396 MPa、377 MPa、19.5%和38.9%IACS。XRD物相分析表明,合金主要由α-Al基体和Mg2Si等合显微组成;通过基体点阵常数的精确计算,能较好地表征合金的固溶程度。固溶处理后残留的析出相粒子和再结晶程度是影响合金拉伸断口形貌的主要因素。
The Al-0.9Mg-0.6Si-0.7Cu alloy was prepared by ingot metallurgy. The conductivity, microstructure, mechanical properties, XRD and phase lattice constants of α (Al) The effects of solution temperature (525 ~ 570 ℃) on the microstructure, mechanical properties and fracture morphology of the alloy were investigated. The results show that the best solution treatment aging time is 555 ℃ × 45 min, solution quenching and 185 ℃ × 5.5 h aging. Under these conditions, the tensile strength, yield strength, elongation and electrical conductivity 396 MPa, 377 MPa, 19.5% and 38.9% IACS, respectively. XRD phase analysis shows that the alloy is mainly composed of α-Al matrix and Mg2Si and other microstructures. The accurate calculation of matrix lattice constant can characterize the solid solution of the alloy well. Residual precipitated particles after solid solution treatment and the degree of recrystallization are the main factors affecting the tensile fracture morphology of the alloy.