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首页> 外文期刊>Materials Science and Engineering >Effects of θ' precipitates on the mechanical performance and fracture behavior of an Al-Cu alloy subjected to overaged condition
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Effects of θ' precipitates on the mechanical performance and fracture behavior of an Al-Cu alloy subjected to overaged condition

机译：θ'析出对过时效条件下Al-Cu合金力学性能和断裂行为的影响

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摘要

In this work, the effects of shear-resistant plate-shaped theta' (Al2Cu) precipitates on mechanical performance and fracture behavior of a heat-treatable Al-Cu alloy were studied. The precipitates, dislocations and micro-voids around grain boundaries were observed using transmission electron microscope and scanning electron microscope equipped with electron backscatter diffraction. The Al-Cu alloy was overaged to ensure that the theta' phase was the only precipitate in the material. The results show that concentration of local strain and pile-up of dislocations occurred along grain boundaries during tensile deformation. A method was developed to calculate the total dislocation density nearby the grain boundaries in the deformed alloy, from which a quantitative relation was established between precipitate number density and void areal density on intergranular fracture surface. The effect of precipitates on the mechanical properties of Al-Cu alloy was also discussed qualitatively. The precipitate number density of the over-aged Al-Cu alloy acted as the dominating factor that influenced the dislocation density and void density on grain boundaries, which thus determined the mechanical properties and fracture behaviors of the alloy.
机译：在这项工作中，研究了抗剪切板状θ'（Al2Cu）沉淀物对可热处理Al-Cu合金的机械性能和断裂行为的影响。使用透射电子显微镜和配备电子背散射衍射的扫描电子显微镜观察晶界周围的沉淀，位错和微孔。 Al-Cu合金被过时效处理，以确保Theta'相是材料中唯一的沉淀物。结果表明，在拉伸变形过程中，沿晶界发生了局部应变集中和位错堆积。开发了一种计算变形合金晶界附近总位错密度的方法，由此建立了晶间断裂表面上的析出物数量密度与空隙面积密度之间的定量关系。定性地讨论了析出物对Al-Cu合金力学性能的影响。过时效Al-Cu合金的析出物数量密度是影响晶界上位错密度和空隙密度的主要因素，从而决定了合金的机械性能和断裂行为。

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