发动机缸盖用新型Al-Si-Cu-Mg铝合金材料

摘要

Based on 319.0 alloy,the content of Cu and Mg was first adjusted,then other trace elements were added.And fi-nally the new-type AI-Si-Cu-Mg aluminum alloy was formed.Compared with traditional aluminum alloys.The new alloy had better ambient and high temperature performance and its mechanical performance outwent that of traditional alloy.Using usual methods,the casting properties of AI-Si-Cu-Mg alloy were tested.Through the trial-production.It was proved that AI.Si.Cu-Mg alloy could meet the molding requirement of cylinder head.By the phase diagram analysis and microstructure observation,the strengthening mechanism of AI-Si-Cu-Mg alloy was understood and the conclusion that the aging strengthening of Mg was better than that of Cu was drawn.%新型Al-Si-Cu-Mg铝合金材料在319.0合金的基础上,通过调整合金中Cu,Mg两种元素的含量和添加其他微量元素,同时改善了室温性能和高温性能,力学性能优于传统发动机缸盖铝合金；采用常用方法测试了新型铝合金的铸造性能,并且经过试制验证了新型铝合金铸造性能满足发动机缸盖的成型性要求；通过相图分析和显微组织观察揭示了新型铝合金的强化机理,Mg的时效强化作用优于Cu.