Journal
METALS AND MATERIALS INTERNATIONAL
Volume 22, Issue 6, Pages 1049-1054Publisher
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-016-6156-9
Keywords
Cu-Ni-Si alloy; discontinuous precipitation; aging; high conductivity; high strength; cooling rate
Funding
- Global Frontier R&D Program on Global Frontier Hybrid Interface Materials R&D Center - Ministry of Science, ICT and Future Planning [2013M3A6B1078874]
- National Research Foundation of Korea (NRF) grant - Korean government (MSIP) [2011-0030058]
- National Research Foundation of Korea [31Z20130012978, 2013M3A6B1078874, 21A20151713274, 2011-0030058, 2013M3A6B1078872] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Cu-Ni-Si alloys with and without Ti were solution treated at 980 A degrees C for 1 h and cooled by air cooling and water quenching, after which the specimens were aged at 500 A degrees 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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