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

Authors :
Ikuo Ohnuma
Hibiki Chinen
Ryosuke Kainuma
Katsunari Oikawa
Toshihiro Omori
Kiyohito Ishida
Source :
Journal of Phase Equilibria and Diffusion. 30:587-594
Publication Year :
2009
Publisher :
Springer Science and Business Media LLC, 2009.

Abstract

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 °C were determined. A fine cuboidal phase with an L12 structure was observed at 900 and 800 °C, where the composition of the new ternary compound obtained by aging at 900 °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 °C but is more stable at 800 °C. These results mean that the thermodynamic stability of the metastable Co3W L12 phase, especially in the low temperature region, increases by the addition of Ga.

Details

ISSN :
18637345 and 15477037
Volume :
30
Database :
OpenAIRE
Journal :
Journal of Phase Equilibria and Diffusion
Accession number :
edsair.doi...........3f9cf820c3a3737d54d29ebb1054784b
Full Text :
https://doi.org/10.1007/s11669-009-9580-4