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Characterization of continuous and discontinuous precipitation phases in pd-rich precious metal alloys

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, ISSN: 1073-5623, Vol: 45, Issue: 9, Page: 3755-3766
2014
  • 3
    Citations
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  • 12
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Metrics Details

  • Citations
    3
    • Citation Indexes
      3
  • Captures
    12

Article Description

Aberration-corrected scanning transmission electron microscopy (AC-STEM), X-ray diffraction (XRD), electron backscatter diffraction, and electron probe microanalysis were applied to characterize continuous and discontinuous phase formation in precious metal alloys used in electrical contacts. The Pd-rich Paliney® (®Paliney is tradename of Deringer-Ney Inc., Bloomfield, CT) alloys contain Pd, Ag, Cu, Au, Pt (and Zn or Ni). With aging at 755 K (482 °C), nanometer-scale chemistry modulation was observed indicating spinodal decomposition. An ordered body-centered tetragonal (bct) structure was also observed with AC-STEM after the 755 K (482 °C) aging treatment and another phase, tentatively identified as β-CuPdZn, was found by microscopy and XRD after prolonged holds at higher temperatures. During slow cooling or isothermal holds at high temperature [755 K to 973 K (482 °C to 700 °C)], a two-phase lamellar structure develops along grain boundaries by discontinuous precipitation. XRD and AC-STEM showed that the lamellar structure was comprised of Ag-rich and Cu-rich fcc phases (α and α). The phases are discussed in relation to a pseudo-ternary diagram based on Ag-Cu-Pd, which provides a simplified representation of the discontinuous phase compositions in the multi-component alloy system. © The Minerals, Metals & Materials Society and ASM International 2014.

Bibliographic Details

Donald F. Susan; Paul G. Kotula; Joseph R. Michael; Mark A. Rodriguez; Zahra Ghanbari

Springer Science and Business Media LLC

Physics and Astronomy; Engineering; Materials Science

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