An investigation of the Al–Pd–Fe phase diagram between 50 and 100 at.% Al: phase equilibria at 900–1020 °C

Abstract

The Al–Pd–Fe alloy system exhibits a continuous range between the solid solution of b.c.c. Fe extending at 1000 °C up to 53 at.% Al and congruent AlPd. At higher Al concentrations three ternary cubic phases designated C, C 1 and C 2 and orthorhombic O–Al 13(Fe,Pd) 4 were revealed. The Al–Pd orthorhombic ε-phases dissolve up to ∼10 at.% Fe and exhibit ε 16 and ε 22 structural variants in addition to ε 6 and ε 28 typical of binary compositions. Al 13Fe 4 dissolves <1.0 at.% Pd, Al 5Fe 2 up to 3.9 at.% Pd, Al 2Fe up to 1.4 at.% Pd, Al 3Pd 2 up to 1.1 at.% Fe. Partial isothermal sections are presented for 1020, 995, 975 and 900 °C.