Ageing of a Pd-35 at % Ag-25 at % Cu solid solution alloy

Karnowsky, M. M.

doi:10.1007/bf00808047

Cited by 22 publications

(2 citation statements)

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“…With the alloys having complicated compositions, however, it is not easy to predict the phase transformation, changes in microstructure and elemental distribution, as they are variable according to the composition. 1,[3][4][5][6][7] In the present study, a Pt containing silverpalladium alloy composed of Ag-Pd-Cu-Pt-Zn was studied. There are very few, if any, dental alloys utilising additions of platinum to silver-palladium alloys, as the advantages of such additions are few considering the effect on the price and specific gravity (hence economy) of platinum.…”

Section: Introductionmentioning

confidence: 99%

Phase transformation and microstructural changes during aging process in Ag–Pd–Cu–Pt–Zn alloy

Noh¹,

Lee²,

Cho³

et al. 2010

Materials Science and Technology

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The Ag–Pd–Cu–Pt–Zn alloy was studied in order to elucidate the age hardening behaviour, phase transformation and changes in microstructure and element distribution during the aging process. The grain interior precipitation of the Cu rich phase from the Ag rich α1 matrix caused an apparent increase in hardness, and the formation and expansion of the Cu rich entanglement structures decreased the hardness. The phase transformation of the Cu–Pd rich α2 phase occurred during softening in the later stage of the aging process, which resulted in the retardation of further softening. Pt was concentrated in the Cu–Pd-rich α2 particle-like structures, and Zn was exclusively concentrated in the CuPd β particle-like structures at approximately four times its concentration in the original alloy composition. The Cu–Pd rich α2 and CuPd β phases, which contained large amounts of Cu, constituted the particle-like structures of various sizes without an apparent contribution to the age hardenability.

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Section: Introductionmentioning

confidence: 99%

Phase transformation and microstructural changes during aging process in Ag–Pd–Cu–Pt–Zn alloy

Noh¹,

Lee²,

Cho³

et al. 2010

Materials Science and Technology

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“…The ternary phase-diagram AgPd-Cu was established some 30 years ago by Raub and Vorwag (1955). Later studies by Karnowsky (1978) and Ohta et al (1979and Ohta et al ( , 1980 have dealt mainly with the age-hardening mechanism of the alloys. In a previous work by the authors (1984), a typical commercial dental Ag-Pd-Cu-Au-based casting alloy was found to decompose into a Pd-Cu-rich compound (A) and a Ag-rich matrix at temperatures up to 900°C.…”

Section: Introductionmentioning

confidence: 99%

Materials Science Structure, Corrosion, and Tarnishing of Ag-Pd-Cu Alloys

Niemi

Herø

1985

J Dent Res

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The structure of Ag-Pd-Cu-Au-Zn alloys can be expected to have an influence on their corrosion and tarnish resistance. Four experimental Ag-based alloys (I-IV) with varying Pd/Ag ratios were studied by scanning electron microscopy (SEM), microprobe analyses, and x-ray diffraction analyses. Both as-cast and in the annealed state, they contain a Pd-Cu-Zn-enriched compound A and a Ag-rich matrix (compound B) with a fcc structure, oa2. X-ray diffraction data indicated that compound A consisted of two fcc phases (aI and a2) in addition to a bcc PdCuxZnx_ phase. The phases of compound A were too small to be distinguishable by SEM. Alloys I-IV could not be solidsolution-annealed to a single phase.Static anodic polarization testing was carried out in an artificial saliva containing Na2S (pS=5). It was found that an alloy made as a duplicate of the Pd-Cu-Zn-rich compound A for a given potential had current density clearly lower than that of the Ag-rich alloys. Furthermore, cathodic reduction of oxygen took place at a considerably higher rate on this Pd-Cu-Zn-rich duplicate alloy than on the Ag-based alloys. It is suggested that micro-galvanic cells are created between the Pd-Cu-Zn-rich compounds A and the Ag-rich matrix in alloys I-IV. Immersion tests in aqueous Na2S solutions (pS = 1.6) showed tarnishing to take place only on the Ag-rich matrix. However, increasing the Pd content of an Ag-rich single-phase alloy increased its tarnish resistance.

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Ag-Cu-Pd (Silver - Copper - Palladium)

Landolt-Börnstein - Group IV Physical Chemistry

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Ageing of a Pd-35 at % Ag-25 at % Cu solid solution alloy

Cited by 22 publications

References 10 publications

Phase transformation and microstructural changes during aging process in Ag–Pd–Cu–Pt–Zn alloy

Phase transformation and microstructural changes during aging process in Ag–Pd–Cu–Pt–Zn alloy

Materials Science Structure, Corrosion, and Tarnishing of Ag-Pd-Cu Alloys

Ag-Cu-Pd (Silver - Copper - Palladium)

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