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首页> 外文期刊>Materials Science and Engineering >Effects of small Er addition on the microstructural evolution and strength properties of an Al-Cu-Mg-Ag alloy aged at 200℃
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Effects of small Er addition on the microstructural evolution and strength properties of an Al-Cu-Mg-Ag alloy aged at 200℃

机译：微量Er对200℃时效Al-Cu-Mg-Ag合金组织和强度性能的影响

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摘要

After extended aging at 200 degrees C for various periods, the microstructures of Al-Cu-Mg-Ag alloys with and without small Er addition is intentionally investigated by optical metallographic examination, scanning electron microscopy (SEM) and quantitative transmission electron microscopy (TEM) characterization to explore the potential effect of Er on the tensile properties. The present results reveal that the Omega precipitation is obviously suppressed by Er, thereby degrading the strength of Al-Cu-Mg-Ag alloy. Meanwhile, the S precipitates, which can be found in Er-free alloy during the whole aging at 200 degrees C, is rarely observed in Er-added alloy after extended aging for 100 h, suggesting the precipitation of S phase is significantly retarded by Er. Inversely, the precipitation of theta' phase is accelerated by Er and it coarsens at a much lower rate. Compared to Er-free alloy, the coarser recrystallized grain size in Er-added alloy eliminates the grain refinement effect by Er. Besides, small Er addition is capable of reducing the amount and size of the residual particles in Al-Cu-Mg-Ag alloy.
机译：在200摄氏度下经过不同时间的长时间老化后，有意通过光学金相检查，扫描电子显微镜（SEM）和定量透射电子显微镜（TEM）研究了添加和不添加少量Er的Al-Cu-Mg-Ag合金的显微组织。表征以探讨Er对拉伸性能的潜在影响。目前的结果表明，Er明显抑制了Omega的析出，从而降低了Al-Cu-Mg-Ag合金的强度。同时，在200℃的整个时效过程中，在无Er合金中会发现S沉淀，而在延长时效100 h后，在添加Er的合金中很少观察到S沉淀，这表明Er显着延迟了S相的沉淀。 。相反，Er加速了theta'相的析出，并以低得多的速率粗化。与不含Er的合金相比，添加Er的合金中较粗的再结晶晶粒尺寸消除了Er引起的晶粒细化效果。此外，少量的Er添加能够减少Al-Cu-Mg-Ag合金中残留颗粒的数量和尺寸。

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