【摘要】 采用力学性能检测、金相组织观察和能谱分析,试验研究了超塑预处理(SPPT)中固溶再结晶工艺对7A04铝合金组织和力学性能的影响。结果表明:固溶再结晶工艺直接影响了合金的最终晶粒大小和力学性能,因此,为了达到细化晶粒和提高力学性能的目的,必须严格控制固溶再结晶的工艺参数。对于7A04铝合金,固溶再结晶工艺采用470℃5min+485℃12min,有效地解决了过时效相的溶解和再结晶新晶粒长大的矛盾,使两者达到较好的配合,合金的综合性能好,强度和伸长率分别达到585N/mm2和17.6%。更多还原

【Abstract】 The effects of solid solution and recrystalization treatment on the microstructure and mechanical properties of 7A04 aluminum alloy by superplastic pre-treatment(SPPT) were investigated by means of optical microscope,mechanical tensile test and EDAX analysis. The results show that the 7A04 aluminum alloy obtains the optimal combination of strength and ductility in such solid solution and recrystallize treatment:470℃ 5 min+480℃ 12 min, the contradiction on dissolution of overageing phases and growth of new grains was settled also by it(470℃ 5 min+480℃ 12 min), and the tensile strength and elongation to failure of the 7A04 aluminum alloy by such treatment is 585 N/mm2 and 17.6% respectively.更多还原