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Experimental Investigation of the Co-Ge Phase Diagram

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Abstract

The Co-Ge phase diagram has been reinvestigated with 20 decisive alloys over the whole composition range by means of differential scanning calorimeter, x-ray diffraction, optical microscopy and electron probe microanalysis. The liquidus lines in Co-rich and Ge-rich portions have been measured for the first time. The compound Co3Ge has been determined to be an ordered fcc-cubic phase and observed to be stable within the temperature range of about 600-750 °C. The previously reported Co5Ge2 and Co4Ge phases were not found in the present work, and instead Co2Ge was confirmed to be stable at 600 °C. The system contains one congruent melting compound βCo5Ge3 and three incongruent melting phases ε(Co), CoGe and CoGe2. Three compounds Co3Ge, Co2Ge and Co5Ge7 are formed via peritectoid reactions. A revised Co-Ge phase diagram is presented based on the present experimental results and reliable literature data.

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Acknowledgments

The financially support from National Natural Science Foundation of China (Grant Nos. 51429101 and 51371199) is greatly acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China

    Yinping Zeng, Han Li, Yong Du, Yafei Pan & Milena Premovic

  2. Hunan University of Technology, Zhuzhou, 412007, China

    Yingbiao Peng

  3. Hunan University of Science and Technology, Xiangtan, 411201, China

    Peng Zhou

  4. Faculty of Technical Science, University of Prishtina, Kosovska Mitrovica, Serbia

    Milena Premovic

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  1. Yinping Zeng
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  2. Han Li
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Correspondence to Yong Du.

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Zeng, Y., Li, H., Du, Y. et al. Experimental Investigation of the Co-Ge Phase Diagram. J. Phase Equilib. Diffus. 38, 843–852 (2017). https://doi.org/10.1007/s11669-017-0592-1

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  • DOI: https://doi.org/10.1007/s11669-017-0592-1

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