Phase Equilibria and Ternary Intermetallic Compound with L12 Structure in Co-W-Ga System

被引：26

作者：

Chinen, Hibiki ^{[1
]}

Omori, Toshihiro ^{[1
]}

Oikawa, Katsunari ^{[1
]}

Ohnuma, Ikuo ^{[1
]}

Kainuma, Ryosuke ^{[2
]}

Ishida, Kiyohito ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION | 2009年 / 30卷 / 06期

基金：

日本科学技术振兴机构;

关键词：

Co-W-Ga system; intermetallics; phase diagrams; phase transformation; precipitates; ALLOYS; PRECIPITATION;

D O I：

10.1007/s11669-009-9580-4

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：

Phase equilibria and stabilities of intermetallic phases appearing in the Co-rich portion of the Co-W-Ga ternary alloys were investigated and isothermal section diagrams at 1200, 1100, 1000, and 900 A degrees C were determined. A fine cuboidal phase with an L1(2) structure was observed at 900 and 800 A degrees C, where the composition of the new ternary compound obtained by aging at 900 A degrees C for the Co-7.4W-12.0Ga alloy was Co-11.2W-11.4Ga (at.%). It was confirmed that this compound is metastable at 900 A degrees C but is more stable at 800 A degrees C. These results mean that the thermodynamic stability of the metastable Co3W L1(2) phase, especially in the low temperature region, increases by the addition of Ga.

引用

页码：587 / 594

页数：8

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