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采用透射电镜、拉伸测试等方法,研究欠时效回归再时效处理对喷射成形7075铝合金显微组织和力学性能的影响,并与单级峰值时效和常规回归再时效处理相比较。结果表明,采用120℃×12h欠时效预处理比120℃×24h峰值时效预处理更有利于在回归处理后合金晶内析出相的回溶,回归处理过程可使合金晶界析出相充分断开,再时效后晶内的析出相细小弥散,合金抗拉强度和屈服强度分别为776和723MPa,均高于T6峰值时效和常规回归再时效水平。
The effects of under-aging re-aging treatment on the microstructure and mechanical properties of spray-cast 7075 aluminum alloy were investigated by transmission electron microscopy and tensile test. The results were compared with single-stage peak aging and conventional regression re-aging treatment. The results show that the 120 ℃ × 12h under-aging pre-treatment is more beneficial than the 120 ℃ × 24h pre-aging treatment to the post-treatment of the alloy precipitates back to the dissolution process, the regression process can be completely off the grain boundary precipitates After re-aging, the precipitated phase is finely dispersed. The tensile strength and yield strength of the alloy are 776 and 723 MPa, respectively, which are higher than those of T6 peak aging and conventional regression re-aging.