Phase equilibria in the Al-rich region of Al-Cu-Ir

The Al-Cu-Ir alloy system was studied in the compositional region above 30 at.% Al from 1100 to 540 degrees C. of the Al-Ir binaries, the beta-AlIr, chi-Al(28)Ir(9), phi-Al(45)Ir(13) and Al(9)I Gamma(2) phases dissolve up to 35, 13, 8.5, 4, 3 and 2.5 at.% Cu, respectively. The solubility of Ir in the Al-Cu eta(1) (eta(2)), is an element of(1) (is an element of(2)) and theta phases is below 1 at.%, while the gamma o dissolves up to 4.5 at.% Ir. The equilibria involve four previously reported ternary phases omega, C(2), epsilon and D(1) forming around Al(70)Cu(20)Ir(10), Al(63)Cu(13)Ir(24), Al(72)Cu(9)Ir(19) and Al(60)Cu(24)Ir(16), respectively, and a new Al(2)CuIr phase revealed inside the beta-phase range below 1063 degrees C. Partial isothermal sections were determined at 1100, 1000, 980, 900, 800, 700, 600 and 540 degrees C. (C) 2009 Elsevier B.V. All rights reserved.