Year: 2009
Type: article
Abstract: The Al-Cu-Ir alloy system was studied in the range above 35 at.%Al.Partial 900 and 540° ° ° °C isothermal sections were determined.Congruent equiatomic AlIr extends at approximately constant Al concentration up to 30 at.% Cu.Cubic C-Al 2.7 Ir (C-phase) dissolves up to 12 at.%Cu, Al 3 Ir up to 8.5 at.%Cu, Al 28 Ir 9 (χphase) and Al 45 Ir 13 (φ-phase) up to 3 at.%Cu, and Al 9 Ir 2 up to 2.5 at.%Cu.Increase of the Cu concentration results in a decrease of the Al concentration of these phases.The Al-Cu є 1 -phase dissolves up to 3 at.%Ir, while the solubility of Ir in θ and η 2 is below 0.5 at.%. Close to the high-Cu limit of the C-phase region an fcc C 2 -phase (Fm , a = 1.53928 nm) structurally related to the C-phase is formed.A stable decagonal phase (D 1phase) is formed below 1002ºC in a compositional range extending from Al 61.5 Cu 20 Ir 18.5 to Al 59 Cu 25.5 Ir 15.5 .A ternary orthorhombic ε 6 -phase (a = 2.34 nm, b = 1.65 nm, c = 1.24 nm) was found below ~1200ºC in a compositional range extending from Al 71.5 Cu 6 Ir 22.5 to Al 68 Cu 12.5 Ir 19.5.An additional ternary ω-phase (P4/mnc, a = 0.6414 nm, c = 1.4842 nm) forming around the Al 70 Cu 20 Ir 10 composition below 683ºC was revealed.Phase diagram / Intermetallics / Quasicrystals
Source: Chemistry of Metals and Alloys
DOI: 10.30970/cma2.0083
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Funder: Forschungszentrum Jülich
OpenAlex ID: W3000948871