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研究了热处理工艺对Sr变质Al-10%Si-3%Cu-0.3%Mg合金组织和和力学性能的影响。通过显微组织观察、力学性能检测及断口形貌分析,对Al-10%Si-3%Cu-0.3%Mg合金硬度和抗拉强度进行了研究。结果表明,在500℃(或500℃×4 h+515℃)下固溶处理,随时间的延长,富铜相的溶解量增多,同时在535℃下出现了富铜相的熔化。同时还发现与一步固溶工艺相比,两步固溶处理工艺下富铜相能够充分溶解,性能更好。经500℃保温4h+515℃保温8h处理性能最佳;对该试样再进行175℃×4h时效处理后,试样抗拉强度和塑性都明显提高。
The effects of heat treatment on microstructure and mechanical properties of Sr-modified Al-10% Si-3% Cu-0.3% Mg alloy were investigated. The hardness and tensile strength of Al-10% Si-3% Cu-0.3% Mg alloy were studied by microstructure observation, mechanical property test and fracture surface morphology analysis. The results show that at 500 ℃ (or 500 ℃ × 4 h +515 ℃) solution treatment, with the extension of time, the dissolution of the copper-rich phase increased, while the melting of the copper-rich phase appeared at 535 ℃. At the same time, it is also found that the copper-rich phase can be fully dissolved and the performance is better compared with the one-step solution-solidification process. After heat preservation at 500 ℃ for 4h and holding at 515 ℃ for 8h, the tensile strength and plasticity of the sample were obviously improved after aging at 175 ℃ for 4h.