Optimization of conductivity and strength in Cu-Ni-Si alloys by suppressing discontinuous precipitation |
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| Authors: | Seung Zeon Han Jehyun Lee Sung Hwan Lim Jee Hyuk Ahn Kwangho Kim Sangshik Kim |
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| Affiliation: | 1.Structural Materials Division,Korea Institute of Materials Science,Changwon,Republic of Korea;2.Department of Materials Science and Engineering,Changwon National University,Changwon,Republic of Korea;3.Department of Advanced Materials Science and Engineering,Kangwon National University,Chuncheon,Republic of Korea;4.School of Materials Science and Engineering,Pusan National University,Busan,Republic of Korea;5.Department of Materials Engineering and Convergence Technology, ReCAPT,Gyeongsang National University,Jinju,Republic of Korea |
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| Abstract: | Cu-Ni-Si alloys with and without Ti were solution treated at 980 °C for 1 h and cooled by air cooling and water quenching, after which the specimens were aged at 500 °C. The two alloys showed different aging characteristics with different cooling rates during the aging process. The conductivity of all alloys increased during aging; for alloys that were water quenched, hardness increased at the early stage of aging and then drastically decreased. The air-cooled Cu-Ni-Si alloy without Ti also experienced an increase in hardness, which then decreased during aging, but the air-cooled Cu-Ni-Si alloy with Ti did not show a drastic decrease in hardness during prolonged aging. A combination of yield strength and conductivity of 820 MPa and 42% IACS, respectively, was achieved in the air-cooled Cu-Ni-Si-Ti alloy after solution treatment. |
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