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Journal of Dental Research
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*Compound via MeSH
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*COPPER, ELEMENTAL
*PALLADIUM
*SILVER COMPOUNDS
*SILVER, ELEMENTAL
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Microstructure and Segregation Behavior of Palladium in Silver-Copper-Palladium Alloys

K.I. Chen

Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, ROC

J.H. Chern Lin

Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, ROC

C.P. Ju

Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan, ROC

It has been reported that the addition of palladium can modify the microstructure and improve the properties of Ag-Cu eutectic alloy as well as admixed Cu-rich amalgam. The purpose of this work was to study the microstructure and segregation behavior of palladium in a series of Ag-Cu-Pd alloys. All microstructural and microchemical results consistently indicated a strong tendency for palladium to form the ordered Cu3Pd superlattice in the copper-rich phase of the present ternary alloys. Transmission electron microscopic examination indicated that, in addition to the large Cu-rich particles, numerous small (typically tens of nanometers) Cu-rich particles were distributed in the Ag-rich phase. In the alloys containing 10 and 15 wt% Pd, the Cu3Pd superlattice had an L1 2-type crystal structure. In the alloy containing 20 wt% Pd, the Cu 3Pd had a periodic (regular) APB structure. The solubility of palladium in the Cu-rich phase was always much larger than that in the Ag-rich phase. The ratio of the palladium concentration in the copper-rich phase to that in the silver-rich phase decreased with the overall palladium content.

Journal of Dental Research, Vol. 75, No. 7, 1497-1502 (1996)
DOI: 10.1177/00220345960750071001
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