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KMID : 0362219960230010129
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Journal of The Korean Research Society for Dental Materials
1996 Volume.23 No. 1 p.129 ~ p.141
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A STUDY ON THE EFFECTS OF TA ADDITION ON MECHANICAL PROPERTIES AND MICRO STRUCTURES OF 75AG-25PD ALLOY
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정호년/Jung, H.N.
김명호/백승호/김경남/백홍구/Kim, M.H./Baik, S.H./Kim, K.N./Baik, H.K.
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Abstract
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In the study, mechanical properties and microstructures of 75wt.%Ag-25wt%Pd alloys with different amount of Ta additions from 0.1 to Lowt.% are investigated. With increasing Ta content, grain´ size is reduced and tensile strength is increased. k hen 0.2wt.% Ta is added, reduction of the grain size is remarkable, and maximum tensile strength is achieved.
i With 0.6wt.% addition of Ta, fine primary crystals are found at the grain boundary after casting and tensile strength is slightly decreased. There is no significant microstructual changes at all heat treatment conditions. TEM, EPNIA, and XRD analysis,reveal that fine primary crystals are Pd3Ta with tetragonal` crystal structure. No apparent change of tensile strength is observed with different heat treatments.
Experimental results shows that Ta intermetallic particles formed,in the melt of Ag-Pd alloy act as nucleation sites for solidification which results in the grain refinement. Addition of Ta more than 0.6wt.% reduces the tensile strength of the alloy )y forming coarse Pd3Ta in the melt. The Optimum amount of Ta addition on Ag-Pd alloy is 0.2wt.%, which reduce grain size about 42% and improve tensile strength up to 209/6 in comparison with Ag-Pd binary alloy without Ta.
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