Aging responses of selective laser melted AlCu5MnCdVA alloys were investigated in this work. After artificial aging treatment, the precipitate strengthening makes the greatest contribution to the strength. At a lower aging temperature (426 K), nano-sized precipitates including Al_xCu_yMn_z result in a limited sacrifice of the plasticity but a significant improvement in strength in the early stage. As the aging duration increases, θ'' and θ' precipitates nucleate, which can strongly improve the strength. Samples aged for 48 h have the highest ultimate tensile strength (473 MPa) due to the presence of θ' with high aspect ratio and dispersed θ''. At a higher aging temperature (446 K), The mixed θ'' and θ' layer structured precipitates contribute to the mechanical properties of the samples aged for 6 h and 10 h. The precipitate growth and the θ'' to θ' transformation both significantly affect the strength and ductility trade-off. Because the interfacial energy of θ'' is smaller than that of θ', the coarsening rate of θ'' is slower. As a result, the in-situ transformed θ' is smaller compared with the θ' nucleating at the defects, which is beneficial for the strength increase. The loss of Cd during SLM is one of the main reasons for the inapplicability of the traditional aging methods. The results highlight the importance of controlling the precipitates through post-aging process.

在这项工作中，研究了选择性激光熔融AlCu5MnCdVA合金的时效响应。经过人工时效处理后，析出物强化对强度的贡献最大。在较低的时效温度（426 K）下，包括Al _x Cu _y Mn _z在内的纳米级沉淀物导致有限的可塑性牺牲，但是在早期强度显着提高。随着时效时间的增加，θ''和θ'会析出晶核，从而可以大大提高强度。老化48小时的样品由于存在高纵横比和分散的θ''而具有最高的极限抗拉强度（473 MPa）。在较高的时效温度（446 K）下，混合的θ''和θ'层结构沉淀物有助于老化6 h和10 h的样品的机械性能。析出物的生长和θ''到θ'的转变都显着影响强度和延展性的取舍。因为θ”的界面能小于θ'的界面能，所以θ”的粗化速率较慢。结果是，与在缺陷处成核的θ′相比，原位变形的θ′较小，这有利于强度的增加。SLM过程中Cd的损失是传统时效方法不适用的主要原因之一。结果强调了通过后老化过程控制沉淀物的重要性。