수지상 구조를 갖는 Cu-free Pd-Ag 합금의 시효경화거동
Age-hardening Behavior of a Cu-free Pd-Ag Alloy with Dendritic Structures
전병욱, 조미향, 이광영,
소속 상세정보
전병욱 ( Jeon Byung-Wook ) - 부산대학교 치의학전문대학원 치과재료학교실
조미향 ( Cho Mi-Hyang ) - 원광보건대학 치기공과
이광영 ( Lee Gwang-Young ) - 원광보건대학교 치기공과
KMID : 1035320150420030239
Abstract
The purpose of the present study was to examine the age-hardening behavior of a Cu-free Pd-Ag alloy with dendritic structures by means of hardness test, field-emission scanning electron microscopic observations, X-ray diffraction study and energy dispersive spectrometer analysis. By isothermal aging of the solution-treated specimen at 400 ℃ and 450 ℃, the hardness increased constantly from the initial stage of aging process and reached a maximum value, about 240 Hv, and further aging caused continuous hardness decrease. The solution-treated specimen was composed of the two phases, that is Ag-rich matrix of face-centered cubic structure and InPd particle-like or dendrite structure of body-centered cubic structure. Age-hardening seemed to be caused by lattice distortion which is resulted from the precipitation of the InPd phase in the Ag-rich matrix, and softening by prolonged aging was caused by coarsening of the lamellar precipitates.
키워드
Age-hardening; Pd-Ag alloy; InPd precipitation; Microstructural change
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