铜和锶对铝-镁-硅基合金板材显微组织及力学性能的影响
Effect of Cu and Sr on the Microstructure and Mechanical Properties of Al-Mg-Si Based Alloy Sheets
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摘要: 采用DSC、XRD、SEM及TEM等分析手段,研究了铜和锶对铝-镁-硅基铝合金汽车车身板材显微组织和力学性能的影响.结果表明:铜的加入,可以使合金形成强化的四元相-Q相,随着铜含量的增加,合金板材的力学性能明显增加,当铜含量为0.86%(质量分数)时,合金的σb达到333MPa,σ0.2达到182MPa;加入锶,可明显细化晶粒,促进时效相的析出,并将β(Al5FeSi)相转变为α(Al8Fe2Si)相,提高合金板材的力学性能;在不同铜含量的合金中加入0.033%锶后,可使其抗拉强度提高10～20MPa.Abstract: The effects of Cu and Sr elements on the mechanical properties of Al-Mg-Si based alloy sheets were studied by using metallograph,DSC,XRD,SEM and TEM.The quaternary phase-Q phase could form when Cu was added into the alloy.The mechanical properties of aluminum alloy sheets could evidently increase.The tensile strength of aluminum alloy sheet achieved 333MPa and the yield achieved 182MPa when Cu content was 0.84%(wt%).Sr could refine grains of the alloys,promote precipitation and change β(Al5FeSi) phase into α(Al8Fe2Si) phase,and thus increase the mechanical properties of aluminum alloy sheets.Compared to the alloy without Sr,the tensile strength increased 10-20MPa when 0.033%Sr was added into the alloy.
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