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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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(11): 1427-1435

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://doi.org/10.1007/s12613-019-1798-5

Cite this article as:

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://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

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Corresponding author:
Chang-rong Li E-mail: crli@mater.ustb.edu.cn
Received: 8 May 2019; Revised: 30 July 2019; Accepted: 15 August 2019

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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