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采用力学性能试验和光学金相分析法,研究了Mg和Mn等元素对6×××系汽车板铝合金组织及性能的影响。结果表明:Mg和Mn是提高6×××系汽车板铝合金时效初期硬化值的元素,但对时效初期硬化速度影响不大。提高Mg和Mn含量,合金经170℃30min时效后的强度增大,伸长率降低。合金固溶处理淬火后的晶粒尺寸和形态不随Mg含量而改变,但随Mn含量增加而显著细化。
The mechanical properties and optical metallographic analysis were used to study the effects of Mg, Mn and other elements on the microstructure and properties of 6 ××× automobile plate aluminum alloy. The results show that Mg and Mn are the elements that increase the initial aging resistance of 6 ××× series automotive aluminum alloy plates, but have little effect on the initial hardening rate. The contents of Mg and Mn increased, the strength of the alloy increased after aging at 170 ℃ for 30min, and the elongation decreased. The grain size and morphology after solution treatment did not change with the content of Mg, but remarkably refined with the increase of Mn content.