Effect of inclusion on strength and conductivity of Cu-Ni-Si alloys with discontinuous precipitation

The effect of inclusion on the strength and conductivity of fully discontinuous precipitated Cu-Ni-Si alloys with and without inclusion was studied. No inclusions were observed in Cu-4.75Ni-1.13Si alloy, the Ni + Si content of which was close to the solubility limit, while they were formed in soluti...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-11, Vol.843, p.156006, Article 156006
Main Authors: Cao, Yicheng, Han, Seung Zeon, Choi, Eun-Ae, Ahn, Jee Hyuk, Mi, Xujun, Lee, Sangjin, Shin, Hyeonseok, Kim, Sangshik, Lee, Jehyun
Format: Article
Language:English
Subjects:
Aging (metallurgy)
Alloys
Chemical precipitation
Conductivity
Copper
Copper base alloys
Cu-Ni-Si alloy
Discontinuous precipitation
Inclusion
Inclusions
Ni2Si
Nickel
Precipitates
Silicon
Strength
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Summary:The effect of inclusion on the strength and conductivity of fully discontinuous precipitated Cu-Ni-Si alloys with and without inclusion was studied. No inclusions were observed in Cu-4.75Ni-1.13Si alloy, the Ni + Si content of which was close to the solubility limit, while they were formed in solution-treated Cu-6Ni-1.42Si alloy at 980 °C. The duration of aging for full discontinuous precipitation (DP) at 500 °C was found to be shorter in Cu-6Ni-1.42Si alloy than Cu-4.75Ni-1.13Si alloy. The strength/conductivity of Cu-6%Ni-1.42%Si alloy with inclusion was 1071 MPa/46% IACS, while it was 966 MPa/50% IACS for Cu-4.75Ni-1.13Si alloy without inclusion, after drawing to the strain of 4. The drawing-induced uni-directional alignment of fiber-like Ni2Si precipitates was believed to increase the conductivity of Cu-Ni-Si alloys by reducing the cross sectional area of lamellar precipitates for the passage of electrons. The increase in strength was possibly due the higher volume fraction of fiber-like Ni2Si precipitates, along with the smaller inter-distance between them, in Cu-6%Ni-1.42%Si alloy with inclusion, than Cu-4.75Ni-1.13Si alloy without inclusion. •Cu-Ni-Si alloy with inclusion showed strength of over 1000 MPa and the conductivity of 46% IACS.•Cu-Ni-Si alloy with inclusion lead the excessive solute in Cu matrix after solution treat.•Inclusions in Cu-Ni-Si alloy can help the increasing strength after aging.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.156006