Simple optimization for strength and conductivity of Cu-Ni-Si alloy with discontinuous precipitation

A Cu alloy with discontinuous precipitation (DP) presents a mechanically lower strength, but a higher conductivity compared to an alloy with continuous precipitation (CP). We controlled the partial distribution of DP in the Cu matrix of Cu-4Ni-1Si alloy by changing aging time. Successive cold-workin...

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Bibliographic Details
Published in:Materials characterization 2022-02, Vol.184, p.111605, Article 111605
Main Authors: Ahn, Jee Hyuk, Han, Seung Zeon, Choi, Eun-Ae, Lee, Geun Young, Kim, Kwangho, Lee, Jehyun, Han, Heung Nam
Format: Article
Language:English
Subjects:
Copper alloys
Discontinuous precipitation
Electrical conductivity
Precipitation
Strength
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Summary:A Cu alloy with discontinuous precipitation (DP) presents a mechanically lower strength, but a higher conductivity compared to an alloy with continuous precipitation (CP). We controlled the partial distribution of DP in the Cu matrix of Cu-4Ni-1Si alloy by changing aging time. Successive cold-working of the alloy showed that by controlling the CP and DP fractions, considerably wide ranges of strength and electrical conductivity, from 500 to 1170 MPa, and from 23 to 50% IACS, respectively, could be achieved. After cold-working, the DP region in the alloy was heavily deformed in comparison with the CP region, showing a drastic increase in strength, with only a small decrease in conductivity. •A very wide conductivity-strength combination can be obtained after cold working by controlling DP fraction in only one alloy.•DP fraction can be changed just according to the change of the aging time.•The DP region is more deformed, and the strength is more quickly increased than CP region in alloy.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2021.111605