Investigation of the stable and the metastable liquidus miscibility gaps in Fe-Sn and Fe-Cu binary systems

Jiang-tao Gao; Chang-rong Li; Cui-ping Guo; Zhen-min Du

doi:10.1007/s12613-019-1798-5

Volume 26 Issue 11

Nov. 2019

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International Journal of Minerals, Metallurgy and Materials > 2019 > 26(11): 1427-1435. > DOI: 10.1007/s12613-019-1798-5

Jiang-tao Gao, Chang-rong Li, Cui-ping Guo, and Zhen-min Du, Investigation of the stable and the metastable liquidus miscibility gaps in Fe-Sn and Fe-Cu binary systems, Int. J. Miner. Metall. Mater., 26(2019), No. 11, pp.1427-1435. https://dx.doi.org/10.1007/s12613-019-1798-5

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Research Article

Investigation of the stable and the metastable liquidus miscibility gaps in Fe-Sn and Fe-Cu binary systems

Author Affilications

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

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This work was supported by National Key Research and Development Program of China (No. 2016YFB0701201) and National Natural Science Foundation of China (No. 51271027).

Received: 07 May 2019; Revised: 29 July 2019; Accepted: 14 August 2019;

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Abstract

Abstract

Two kinds of experimental methods were tried in the present work:(i) the powder metallurgy method combined with differential thermal analysis (DTA) to determine the metastable liquidus miscibility gap for a Fe-Cu binary system and (ii) the high-temperature melting method combined with isothermal treatment to determine the stable liquidus miscibility gap for a Fe-Sn binary system. The experimental method was adopted according to the characteristics of the liquidus miscibility gap of the specific system. Using the powder metallurgy method, a uniform microstructure morphology and chemical composition was obtained in the DTA specimen, and the phase-separation temperature of the supercooled metastable liquid was measured. The isothermal treatment was applied for the samples inside the stable liquidus miscibility gap; here, equilibrated compositions were reached, and a layered morphology was formed after rapid cooling. The liquid miscibility gaps of the Fe-Cu and Fe-Sn binary systems were measured, and the peak temperatures of the corresponding miscibility gaps were determined to be about 1417℃ at x(Cu)=0.465at% and 1350℃ at x(Sn)=0.487at%, respectively. On the basis of the experimental results, both the Fe-Cu and the Fe-Sn binary systems were thermodynamically assessed.
- binary systems,
- miscibility gap,
- differential thermal analysis (DTA),
- metastable state

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References

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