Accessible Requires Authentication Published by De Gruyter December 5, 2014

800°C isothermal section of the Co–Cr–Mo–Si quaternary system

Songlin Jiang, Fucheng Yin, Minghua Zhang, Manxiu Zhao and Zhi Li

Abstract

The 800°C isothermal section of the Co–Cr–Mo–Si quaternary system with the Co content fixed at 70 at.% and different contents of Cr, Mo and Si was determined by means of X-ray diffraction and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. Twelve different phase regions could be identified; one of them being a wide (Co) + Co3Mo2Si phase field, but only one four-phase region consisting of (Co) + Co3Mo +Co7Mo6 + Co3Mo2Si was experimentally confirmed. The measured solubility of Si in the Co3Mo phase is rather limited but could reach up to 15.1 at.% in Co7Mo6. The solubility of Cr in Co3Mo and Co7Mo6 was measured to be as high as 13.4 and 23.3 at.%, respectively, and the maximum solubility of Cr in (Co), αCo2Si and Co3Mo2Si could reach 26.9, 5.6 and 12.5 at.%, respectively.


* Correspondence address, Professor Dr. Fucheng Yin, School of Mechanical Engineering, Xiangtan University, Hunan 411105, PR China and Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Hunan 411105, PR China, Tel.: +86 731 58292210, Fax: +86 731 58292210, E-mail:

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Received: 2014-01-22
Accepted: 2014-06-02
Published Online: 2014-12-05
Published in Print: 2014-12-08

© 2014, Carl Hanser Verlag, München