A contribution to the Al-Pd phase diagram

The Al-Pd alloy phase diagram was revised in the compositional range of 0-4 0 at.% Pd. The existence of the lambda, gamma and delta phases reported ear lier was confirmed. The gamma -phase was found to be a low-temperature phas e isostructural to A(21)Pt(8) (I4(1)/a; a = 1.2998(4), c = 1.0729(7) nm) an d to be formed at 27.5 at.% Pd. In addition, two structurally related high- temperature orthorhombic phases were observed close to this composition. On e, at 25.5-26.9 at.% Pd, is associated with the Al3Pd reported earlier in t he literature and has lattice parameters of a = 2.35, b = 1.68 and c = 1.23 nm, the other, at about 28 at.% Pd has lattice parameters of a = 2.35, b = 1.68 and c = 5.70 nm. The transition temperatures were specified from the thermal analysis measurements. (C) 2001 Elsevier Science B.V. All rights re served.