Laser powder bed fusion of a Cu-Ni-Al alloy using the compositional grading approach

Using a modified laser powder bed fusion (LPBF) technique, a compositionally graded Cu-Ni alloy was fabricated. Through microstructural and mechanical characterization on the samples extracted from it, the addition of 7.6 wt.% Ni to Cu is identified as the minimum required for obtaining a crack-free...

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Bibliographic Details
Published in:Scripta materialia 2023-07, Vol.231, p.115441, Article 115441
Main Authors: Wei, Siyuan, Zhao, Yakai, Li, Shi-Hao, Chen, Shilin, Lau, Kwang Boon, Soh, Verner, Lee, Jing Jun, Zhang, Baicheng, Tan, Cheng Cheh, Wang, Pei, Ramamurty, Upadrasta
Format: Article
Language:English
Subjects:
Compositional graded alloy
Copper alloys
Electrical resistivity/conductivity
Laser powder bed fusion
Mechanical properties
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Summary:Using a modified laser powder bed fusion (LPBF) technique, a compositionally graded Cu-Ni alloy was fabricated. Through microstructural and mechanical characterization on the samples extracted from it, the addition of 7.6 wt.% Ni to Cu is identified as the minimum required for obtaining a crack-free and nearly-fully-dense coupons using LPBF. Subsequently, 3 wt.% Al was added to the Cu-7.6 wt.% alloy to deplete the solute Ni atoms from the matrix through the precipitation of Ni3Al upon aging of the LPBF Cu-Ni-Al alloy, which simultaneously enhances the strength and electrical conductance of the alloy. Through this example, we demonstrate the potential of high-throughput screening of alloys suitable for LPBF through the fabrication of the compositionally graded alloys and subsequent alloy design for optimum property combinations. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2023.115441