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.
|出版ステータス||Published - 2001|
|イベント||3rd International Symposium on Structural Intermetallics (ISSI 2001) - Jackson Hole, WY, United States|
継続期間: 2001 9 23 → 2001 9 27
|Conference||3rd International Symposium on Structural Intermetallics (ISSI 2001)|
|City||Jackson Hole, WY|
|Period||01/9/23 → 01/9/27|
ASJC Scopus subject areas