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通过调整过热处理温度研究了亚共晶铝合金Al Si7Mg0.6熔体的显微组织及力学性能变化规律。结果表明,Al Si7Mg0.6熔体经过过热处理后,Si形貌转变为细小的纤维状或粒状;合金基体的铁相形态由棱边尖锐的条状转变为骨骼状,减少了对基体的割裂作用。在800℃过热温度内,随着过热温度的增加,合金的抗拉强度和伸长率增大。
The microstructure and mechanical properties of the hypoeutectic Al Si7Mg0.6 melt were studied by adjusting the temperature of the overheat treatment. The results show that the microstructure of Al Si7Mg0.6 melt is transformed into fine fibrous or granular Si by the overheating process. The phase morphology of the alloy matrix changes from a sharp strip to a skeletal shape, which reduces the splitting of the matrix effect. At 800 ℃ overheating temperature, with the increase of overheating temperature, the tensile strength and elongation of the alloy increases.