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采用金属型铸造制备Al-11Si-2.5Cu-Mg合金,利用金相显微镜及拉伸试验等方法,研究了热处理对Al-11Si-2.5Cu-Mg合金组织及性能的影响。结果表明,最佳热处理工艺为:510℃×7h固溶+160℃×8h时效,此时合金的抗拉强度和伸长率分别达到385 MPa和8.2%。经热处理后,铸态组织的点状共晶Si相被球化,大部分Si质点都比较圆整,并在α固溶体上析出细小而弥散的Al2Cu、Mg2Si中间强化相,使合金强度得到提高。
Al-11Si-2.5Cu-Mg alloy was prepared by metal casting. The effects of heat treatment on microstructure and properties of Al-11Si-2.5Cu-Mg alloy were investigated by metallographic microscope and tensile test. The results show that the best heat treatment process is: 510 ℃ × 7h solution + 160 ℃ × 8h aging, the tensile strength and elongation reach 385 MPa and 8.2% respectively. After heat treatment, the as-cast eutectic Si phase of the as-cast microstructure is spheroidized, most of the Si particles are relatively round, and fine and dispersed Al2Cu and Mg2Si intermediate strengthening phases are precipitated on the α solid solution to enhance the alloy strength.