Effects of quaternary alloying elements on the γ′ solvus temperature of Co-Al-W based alloys with fcc/L12 two-phase microstructures

被引：198

作者：

Ooshima, Masahiro ^{[1
]}

Tanaka, Katsushi ^{[1
]}

Okamoto, Norihiko L. ^{[1
]}

Kishida, Kyosuke ^{[1
]}

Inui, Haruyuki ^{[1
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 6068501, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 508卷 / 01期

关键词：

Cobalt alloys; Phase separation; Thermodynamics; Ordering;

D O I：

10.1016/j.jallcom.2010.08.050

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：

The effects of quaternary elements on the gamma' solvus temperature of Co-Al-W based alloys with fcc/L1(2) two-phase microstructures have been investigated both experimentally and theoretically. The gamma' solvus temperature and partitioning behavior predicted by thermodynamic calculation agree well with those experimentally determined, indicating the usefulness of thermodynamic calculation in predicting the variation of the gamma' solvus temperature of Co-Al-W based alloys with quaternary elements. All investigated quaternary elements, except for Re, increase the gamma' solvus temperatures of Co-Al-W based alloys with varying efficiencies depending on quaternary element. Of the investigated quaternary elements, Nb, Ta and Ti are found to be the most effective in increasing the gamma' solvus temperature of Co-Al-W based alloys, which is consistent with the prediction from thermodynamic calculation. They have common thermodynamic characteristics that the ordering tendency with Co is high (but not significantly) and the phase-separation tendency with W is not so high. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：71 / 78

页数：8

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