The precipitate morphology and lattice mismatch of ternary (Pt)/Pt3Al alloys

P. J. Hill*, Y. Yamabe-Mitarai, H. Murakami, L. A. Cornish, M. J. Witcomb, I. M. Wolff, H. Harada

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

19 Citations (Scopus)


The effects of some ternary alloying additions (Ti, Cr, Ru, Ta and Ir) on the phase relations and properties of two-phase (Pt)/∼Pt3Al alloys were investigated. The crystal structure and morphology of the ∼Pt3Al phase were examined, and the compressive strengths and melting temperatures of the alloys were determined. It was found that Ti, Cr and Ta partitioned to ∼Pt3Al and stabilised the Ll2 form of this phase. The ∼Pt3Al phase in these alloys had cuboidal morphologies and a small lattice misfit with the matrix (about -0.7%). The tetragonal D0′C form of ∼Pt3Al was observed in the alloys containing Ru and Ir. The ∼Pt3Al in these alloys formed in groupings shaped somewhat like a Maltese cross, which may result from the higher lattice misfit in these alloys (-1 to -1.2%) or the D0′C crystal structure of the ∼Pt3Al. The compressive strengths of the alloys were found to depend on the proportion of ∼Pt3Al in the microstructures; higher strengths being recorded for alloys containing larger proportions of ∼Pt3Al.

Original languageEnglish
Number of pages7
Publication statusPublished - 2001
Externally publishedYes
Event3rd International Symposium on Structural Intermetallics (ISSI 2001) - Jackson Hole, WY, United States
Duration: 2001 Sept 232001 Sept 27


Conference3rd International Symposium on Structural Intermetallics (ISSI 2001)
Country/TerritoryUnited States
CityJackson Hole, WY

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)


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