【摘要】 高强度7×××系铝合金是航空航天工业的主要结构材料。对常用的五种7×××系铝合金的化学成分、不同厚度的板材以及其对应的力学性能进行了对比分析。通过Thermo-Calc热力学软件计算和试验验证,分析研究了合金中的元素配比、析出相与力学性能以及淬火性能之间的关系。结论是:对于7×××系铝合金,提高合金元素添加量可以获得更多的沉淀析出相,从而提高合金的强化效果;而减少沉淀析出相的总量可以降低7×××系铝合金的淬火敏感性;减少强化效果差的析出相,获得更多有效的强化相,则既有利于提高强化效果又有利于降低7×××系铝合金的淬火敏感性。更多还原

【Abstract】 High strength 7 × × × series aluminum alloy is the main structure material in aviation and spaceflight industry.The corresponding relationship of chemical composition,plate thickness and mechanical property of five commercial 7 × × × series aluminum alloys has been analyzed.The relation among the alloying element burden,segregated phase,mechanical property and quenching property has been calculated and verified by using of Thermo-Calc thermodynamics software.The results show that to increase alloying element quantity can obtain more dispersed segregation phases,therefore the strengthening effect of 7 × × × alloy can be improved;meanwhile the quenching sensitivity of 7 × × × series aluminum alloy would be decreased while decrease the segregated phases;to reduce the segregated phases with low strengthening effect can obtain more effective strengthening phases,which is in favor of both increasing the strengthening effect and decreasing quench sensitivity of 7 × × × series aluminum alloy.更多还原