아연과 인듐이 첨가된 은-팔라디움 합금의 석출에 의한 시효경화기구
Age-hardening mechanism by precipitation in a zinc- and indium-added silver-palladium alloy
김형일, 김성민, 전병욱, 조수연, 이광영, 권용훈, 설효정,
소속 상세정보
김형일 ( Kim Hyung-Il ) - 부산대학교 치의학전문대학원 치과재료학교실
김성민 ( Kim Sung-Min ) - 부산대학교 치의학전문대학원 치과재료학교실
전병욱 ( Jeon Byung-Wook ) - 부산대학교 치의학전문대학원 치과재료학교실
조수연 ( Cho Su-Yoen ) - 부산대학교 치의학전문대학원 치과재료학교실
이광영 ( Lee Gwang-Young ) - 부산대학교 치의학전문대학원 치과재료학교실
권용훈 ( Kwon Yong-Hoon ) - 부산대학교 치의학전문대학원 치과재료학교실
설효정 ( Seol Hyo-Joung ) - 부산대학교 치의학전문대학원 치과재료학교실
KMID : 1035320140410010039
Abstract
The age-hardening mechanism of a copper-free silver-palladium alloy is unclear yet because the age-hardening mechanism is variable even with slight compositional changes. The aim of present study is to elucidate the age-hardening mechanism and relation of age-hardenability with the phase transformation and microstructural changes of a Zn- and In-added Ag-Pd alloy by means of the hardness test, X-ray diffraction study, field emission-scanning electron microscopic observation and energy dispersive spectrometer analysis. The matrix was composed of the Ag-rich α1 phase containing small amounts of solute elements, and the particle-like structures were composed of the PdZn-based β1 phase containing relatively large amounts of In. The lamellar-forming grain boundary reaction which is usually observed in Ag-Pd alloys containing Cu was not observed in the Zn- and In-added Ag-Pd alloy. The grain interior precipitate composed of the Pd-Zn-rich phase containing In resulted in apparent hardening from the early stage of aging process, and its coarsening by prolonged aging resulted in softening. In the specimen alloy, Zn and In formed extra phase preferentially with Pd, and the amount of Zn and In which took part in the precipitation hardening was very small.
키워드
Age-hardenability; Precipitation; Zn and In-added Ag-Pd alloy; Softening; microstructural change
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