时效处理对AlSi7Mg0.4合金组织结构和力学性能的影响
Effect of Aging Treatment on Microstructure and Mechanical Properties of AlSi7Mg0.4 Alloys
摘要: AlSi7Mg0.4合金是可强化热处理的铝合金。本文通过对AlSi7Mg0.4合金进行不同的时效处理。通过x射线衍射、金相显微镜进行了组织结构表征。采用差示扫描量热动态法测试了样品随温度的变化特征。进行了拉伸和疲劳性能测试，结果表明，不同温度的时效处理所得样品的抗拉强度变化不大，但屈服强度随时效温度降低而降低，断后伸长率随时效温度降低而升高；而且时效温度越低，疲劳性能越好。
Abstract:
AlSi7Mg0.4 alloy is an aluminum alloy with strengthened heat treatment. In the paper, AlSi7Mg0.4 alloys with different aging treatment were investigated. The structure was characterized by X-ray diffraction (XRD) and metallographic microscope. Dynamic change characteristics of the sample with the temperature were tested through differential scanning calorimeter (DSC) method. Through tensile and fatigue tests, the results showed that the yield strength was decreased with aging temperature decrease, and the break elongation was increased with aging temperature decrease. And the fatigue performance was better at lower aging temperature.
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