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한승전,이재현,임성환,안지혁,김광호,김상식 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.6
Cu-Ni-Si alloys with and without Ti were solution treated at 980 °C for 1 h and cooled by air coolingand water quenching, after which the specimens were aged at 500 °C. The two alloys showed differentaging characteristics with different cooling rates during the aging process. The conductivity of all alloysincreased during aging; for alloys that were water quenched, hardness increased at the early stage ofaging and then drastically decreased. The air-cooled Cu-Ni-Si alloy without Ti also experienced anincrease in hardness, which then decreased during aging, but the air-cooled Cu-Ni-Si alloy with Ti didnot show a drastic decrease in hardness during prolonged aging. A combination of yield strength andconductivity of 820 MPa and 42% IACS, respectively, was achieved in the air-cooled Cu-Ni-Si-Ti alloyafter solution treatment.
Discontinuous Precipitation at the Deformation Band in Copper Alloy
한승전,안지혁,유영수,이제현,Masahiro Goto,김광호,김상식 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.1
The Cu-Ni-Si alloy is known as a precipitation hardening alloy, where the Ni2Si intermetallic compound is precipitatedin the matrix during aging. There are two types of precipitation of Ni2Si: continuous and discontinuouscellular. The discontinuous cellular precipitation is generally initiated at interfaces especially grain boundaries inthe matrix. To observe the grain boundary effect on the discontinuous precipitation, a large-grained Cu-Ni-Si-Tialloy was intentionally fabricated by unidirectional solidification and plastically deformed by groove rolling. While discontinuous cellular precipitation has been generally known to occur only at the high angled grain boundariesin the alloys, we found that it was also generated inside the grains, at the deformation bands formed by plasticdeformation.
Effect of V Addition on Hardness and Electrical Conductivity in Cu-Ni-Si Alloys
한승전,J. H. Gu,이재현,Z. P. Que,J. H. Shin,임성환,김상식 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.4
The effect of vanadium (V) addition on the microstructure, the hardness and the electrical conductivity of Cu-2.8Ni-0.7Si alloys was investigated. The V-free, the 0.1 wt% V-added, the 0.2 wt% V-added Cu base alloys were exposed to the same experimental conditions. After the cold rolling of the studied alloys, the matrix was recrystallized during the solution heat treatment at 950 °C for 2 h. However, small amounts of vanadium substantially suppressed the recrystallization and retarded the grain growth of the Cu base alloys. The added vanadium accelerated the precipitation of Ni2Si intermetallic compounds during aging and therefore it contributed positively to the resultant hardness and electrical conductivity. It was found that the hardness and the electrical conductivity increased simultaneously with increasing aging temperature and time with accelerated precipitation kinetics by the addition of vanadium. In the present study, the Cu-2.8Ni-0.7Si alloy with 0.1 wt%V was found to have an excellent combination of the hardness and the electrical conductivity when it was aged at 500 °C.
Cr 및 Zr 첨가가 Cu-6Ni-4Sn 합금의 인장 및 부식 특성에 미치는 영향
한승전,김상식,김기원,김창주 대한금속재료학회 2002 대한금속·재료학회지 Vol.41 No.2
The effects of Cr and/or Zr additions on tensile and corrosion behaviors of Cu-6i-4Sn alloy were examined. It was observed that the changes in microstructure and tensile properties of Cu-6Ni-4Sn alloy were not significant with the addition of 0.1 to 0.3% Cr and/or Zr in the present study. The resistance to pitting corrosion was, however, improved in 3.5% NaCl solution with particularly the addition of Cr and Zr. The passive films observed in Cu-6Ni-4Sn alloys with Cr and/or Zr addition appeared to be more stable than non-Cr and/or Zr containing counterpart. The mechanism(s) of the improved resistance to pitting corrosion for Cu-6Ni-4Sn alloy with the addition of Cr and/or Zr is discussed based on the experimental observations.