双级固溶处理对2A14铝合金组织和力学性能的影响

发布时间：2018-03-20 15:42

  本文选题：A铝合金　切入点：双级固溶　出处：《热加工工艺》2017年04期 　论文类型：期刊论文

【摘要】：通过拉伸试验、金相观察、扫描电镜、透射电镜等手段研究了不同双级固溶处理对2A14铝合金力学性能及组织的影响。结果表明:双级固溶获得了较高程度的过饱和固溶体,仅发生了部分再结晶;最佳双级固溶工艺为:470℃×2 h+510℃×1 h,采用该工艺并经160℃×8 h时效后,合金的拉伸力学性能达到σb=508.4 MPa,σ0.2=422.7 MPa,δ=14.9%;经双级固溶后,Al2Cu相已基本完全溶解,未溶相主要为富含Fe、Si的杂质相,其拉伸断口呈现出典型的韧窝型断裂;时效后合金中的主要强化相为S′相,且在470℃×2 h+510℃×1 h二级固溶并时效后的析出相较单级固溶的数量更多且细小均匀,因而获得了更高的析出强化效果。
[Abstract]:The effects of different two-stage solution treatment on mechanical properties and microstructure of 2A14 aluminum alloy were studied by means of tensile test, metallographic observation, scanning electron microscope and transmission electron microscope. The results showed that a high degree of supersaturated solid solution was obtained by two-stage solution. Only partial recrystallization occurred, and the optimum two-stage solution process was: W 470 鈩，

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