7A04铝合金时效强化的试验研究及其强度计算  

Experimental research and strength prediction on aged strengthening of 7A04 aluminium alloy

作　　者：吴海宏[1] 张雨平[2] 张世兴[1] 邓鹏辉[1] 

机构地区：[1]河南工业大学机电工程学院,河南郑州450007 [2]东北轻合金有限责任公司,黑龙江哈尔滨150060

出　　处：《轻合金加工技术》2009年第2期37-41,共5页Light Alloy Fabrication Technology

摘　　要：以铝合金时效强化动力学理论为基础,研究了高温预热固溶处理后不同的时效工艺对7A04铝合金组织和性能的影响,得到了优化的双级时效工艺。在此基础上,建立了合金成分、析出相尺寸及其体积分数与合金屈服强度之间的计算模型,并利用该模型对7A04铝合金单级时效和双级时效后的屈服强度进行计算。该模型集成了固溶强化和弥散强化对合金屈服强度的贡献,在达到最大时效强度之前,计算结果和试验测量结果较为一致。此后,随着强化相体积分数计算偏差增加,计算强度与测量强度之间的误差也有所增大。Based on the theory of aged strengthening kinetics of aluminium alloy, author researched the effect of different ageing proeessos on the microstrueture and properties of 7A04 aluminium alloy preheated solution in high temperature and found an optimum two-step aging process. Fuahermore, author put a model used to calculate yield strength of 7A04 treated by single step ageing and two step ageing. The model described the relation among composition, precipitate size and its volume fraction, and yield strength of the alloy. The model integrated the strengthening response from solution and dispersion strengthening. The calculated results are close to the experimental values before the highest ageing strength. Afterwards, the error between calculated values and measured ones increases with extend of ageing time, which mainly came from the error of precipitate volume fraction.

关 键 词：7A04铝合金 时效处理 强度计算 

分 类 号：TG166.3[金属学及工艺—热处理]