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利用扫描电镜、能谱分析仪、X射线衍射仪、万能拉伸试验机、布氏硬度计等分析和测试了Al-10Si-5Cu-0.75Mg合金的显微组织和力学性能,探讨了合金热处理过程中析出相的溶解过程和强韧化机制。结果表明,合金最佳热处理工艺为500℃×8 h固溶,190℃×6 h人工时效;合金抗拉强度、硬度、伸长率与铸态相比分别提高了40%、62%、29%。固溶过程产生的强化主要是来自Al_2Cu相的溶解,时效过程产生的强化主要是由于析出相θ’对位错的阻碍作用。
The microstructure and mechanical properties of Al-10Si-5Cu-0.75Mg alloy were analyzed and tested by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, universal tensile testing machine and Brinell hardness tester. In the process of precipitation phase dissolution process and toughening mechanism. The results show that the optimum heat treatment process is 500 ℃ × 8 h solution, artificial aging at 190 ℃ × 6 h. The tensile strength, hardness and elongation of the alloy increase by 40%, 62%, 29% %. The strengthening produced by the solid solution process mainly comes from the dissolution of Al 2 Cu phase, and the strengthening produced by the aging process is mainly due to the obstruction of the dislocation caused by the precipitating phase θ ’.