Phase equilibria and mechanical properties of the Ir-W-Al system
Phase equilibria and mechanical properties of the Ir-W-Al system
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DOI：
10.1016/j.intermet.2014.07.021
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发表时间：
2014-12-01
期刊：
影响因子：
4.4
通讯作者：
Ishida, K.
中科院分区：
文献类型：
--
作者：
Omori, T.;Makino, K.;Ishida, K.
Phase equilibria in the Ir-W, Ir-Al and Ir-W-Al systems at temperatures between 1100 degrees C and 1600 degrees C were experimentally investigated using diffusion couples and two- or three-phase alloys, and the mechanical properties of gamma' (L1(2)) strengthened Ir-W-Al alloys were examined by hardness and compression tests at room and elevated temperatures. The phase boundaries between the gamma(A1)/epsilon'(D0(19)), epsilon'/epsilon(A3) and epsilon/epsilon ''(B19) in the Ir-W system at 1400 degrees C-1600 degrees C and those between the gamma/beta(B2) and beta/Al2.7Ir in the Ir-Al system at 1100 degrees C-1400 degrees C were determined. The phase diagrams in the Ir-rich corner of the Ir-W-Al ternary system at 1300 degrees C and 1400 degrees C were also determined. The existence of the gamma' phase of the Ir-3(W,Al) ternary compound was confirmed, and this system was found to consist of the gamma', epsilon, epsilon' and beta phases in the Ir-rich portion. It was also found from hardness and compression tests up to 1200 degrees C that Ir-Al-W alloys having the gamma + gamma' structure with a small lattice misfit show high hardness and strength at room and high temperatures. (C) 2014 Elsevier Ltd. All rights reserved.
