An investigation of the high-Al part of the Al-Pd-Ru phase diagram at 790-900 °C

被引：13
作者：
Pavlyuchkov, D. [1 ,2 ]
Grushko, B. [1 ]
Velikanova, T. Ya. [2 ]
机构：
[1] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany
[2] IN Frantsevich Inst Problems Mat Sci, UA-03680 Kiev 142, Ukraine
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 469卷 / 1-2期
关键词：
Intermetallics; X-ray diffraction; Phase diagram; QUASI-CRYSTALS; ALLOY SYSTEM; NI-CO; APPROXIMANTS; TRANSITION;
D O I：
10.1016/j.jallcom.2008.01.138
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Partial isothermal sections of the Al-Pd-Ru phase diagram at 790 and 900 degrees C are presented. Complex orthorhombic 8-phases extending from Al(3)Pd up to 15 at.% Ru exhibit structural variants including transient irregular structures. The Al(3)Pd(2) phase dissolves up to 2 at.% Ru, Al(13)Ru(4) <2.5 at.% Pd and Al(2)Ru up to 1 at.% Pd. A stable icosahedral quasicrystalline phase is formed around the Al(71.5)Pd(17)Ru(12.5) composition. At nearby compositions two complex primitive cubic phases with a approximate to 2.0 and approximate to 4.0 nm were observed. These cubic phases exhibit powder X-ray diffraction (XRD) patterns very similar to that of the icosahedral phase. At compositions close to the high-Ru limit of the epsilon-range the electron diffraction patterns of complex orthorhombic structures and ID quasicrystalline structure were revealed. At lower-Al concentrations three ternary cubic phases structurally related to quasicrystals are formed: primitive C (a approximate to 0.75 nm), bcc C(1) and fcc C(2) with a double lattice parameter. (C) 2008 Elsevier B.V. All rights reserved.
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页码：146 / 151
页数：6
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