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中文摘要：
采用力学性能测试、金相﹑扫描电镜及透射电镜等手段研究复合添加Cr和Yb元素对2519A合金显微组织及力学性能的影响。研究结果表明：添加稀土元素Yb，能细化合金的时效强化相，提高合金力学性能。未溶于基体的Yb元素与Cu和Al元素主要形成AlCuYb金属间化合物，并沿晶界分布。复合添加Cr和Yb元素，与单独添加Yb元素的合金相比，Cr元素的加入改变了稀土元素的分布状态，合金在结晶过程中沿晶界形成的富稀土相明显减少，使更多的Yb元素固溶到基体中，从而更有效地细化合金的时效强化相，提高合金的力学性能，使合金室温抗拉强度由490.5MPa提高至508.9MPa。
英文摘要：
The effects of composite additions of Cr and Yb on microstructures and mechanical properties of 2519A aluminum alloy were investigated by tensile test, optical microscopy, scanning electron microcopy and transmission electron microscopy. The results show that aging precipitates can be refined with appropriate addition of Yb, which increases the mechanical properties of the alloy. The AlCuYb phase is formed at the grain boundary of as-cast with Yb addition. Compared with the 2519A alloy with Yb only, the distribution of Yb element is changed in the 2519A alloy with both Yb and Cr. The coarse rare earth-rich phase along the grain boundaries decreases while the solubility of Yb increases in the alloy with Yb and Cr. Aging precipitates can be better refined with appropriate additions of Cr and Yb, which increases the mechanical properties of the alloy from 490.5 MPa to 508.9 MPa.
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