Aging responses of an Al-Cu alloy fabricated by selective laser melting

被引：30
作者：
Hu, Zhiheng [1 ]
Qi, Yang [1 ]
Gao, Shubo [2 ]
Nie, Xiaojia [1 ]
Zhang, Hu [1 ,3 ]
Zhu, Haihong [1 ]
Zeng, Xiaoyan [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Hubei, Peoples R China
[2] Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore
[3] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China
来源：
ADDITIVE MANUFACTURING | 2021年 / 37卷
基金：
中国国家自然科学基金;
关键词：
Selective laser melting; Aluminum alloys; Heat treatment; Precipitates; Mechanical properties;
D O I：
10.1016/j.addma.2020.101635
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 AlxCuyMnz result in a limited sacrifice of the plasticity but a significant improvement in strength in the early stage. As the aging duration increases. theta '' and theta' 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.' with high aspect ratio and dispersed theta''. At a higher aging temperature (446 K), The mixed theta'' and theta' layer structured precipitates contribute to the mechanical properties of the samples aged for 6 h and 10 h. The precipitate growth and the theta'' to theta' transformation both significantly affect the strength and ductility trade-off. Because the interfacial energy of theta'' is smaller than that of.', the coarsening rate of theta'' is slower. As a result, the in-situ transformed theta' is smaller compared with the.' 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.
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页数：14
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