Precipitation behavior of Ag-Pd-In dental alloys.
Age-hardening characteristics and precipitation behavior of Ag-25%Pd-3%In-1%Zn-0.5%Ir alloy were investigated in detail by means of hardness testing, X-ray diffraction, electron microscopy and resistivity measurement. The solution treating could be accomplished at 980 degrees C and the aging in the temperature range from 950 to 850 degrees C occurred by continuous precipitation. The aging in the temperature range from 850 to 450 degrees C occurred first, forming GP-zones with a hardness increase and then in overaging stage by forming discontinuous precipitation, which consisted of lamellae of solute (Pd, In, Zn) depleted Ag-rich phase and (Pd,Ag)3(In,Zn) intermetallic phase. The hardness increased very fast to its peak in 10 min during aging at temperatures between 450 and 550 degrees C.
Suh
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YC
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusung-Dong, Yusung-Gu, Taejon, 305-701, South Korea. s_syc@cais.kaist.ac.kr
Lee
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Ohta
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