Ag-Cu-Co体系的相图热力学研究

doi:10.19976/j.cnki.43-1448/TF.2022036

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Abstract Phase constituents of the Ag-Cu-Co alloys in as-cast and annealed at 400 ℃ and 650 ℃ were studied by inductively coupled plasma optical emission spectrometer (ICP-OES), electron probe microanalysis (EPMA) and X-ray diffraction (XRD). The results show that no ternary compound is observed in this work. At 400 ℃, the maximum solubility of Cu and Co in FCC(Ag), Ag and Co in FCC(Cu) and Ag and Cu in HCP(Co) are determined to be 10.08% and 1.43%, 2.37% and 0.98%, as well as 0.22% and 4.15% (mole fraction, %, the same below), respectively. While at 650 ℃, the maximum solubility of Cu and Co in FCC(Ag), Ag and Co in FCC(Cu) and Ag and Cu in FCC(Co) are determined to be 15.74% and 0.97%, 3.69% and 4.47% as well as 0.15% and 7.48%, respectively. Thermodynamic database of the Ag-Cu-Co system is extrapolated from the reported thermodynamic description of the three sub-binary systems of Ag-Cu, Ag-Co and Cu-Co in literature, based on the CALPHAD (calculation of phase diagram) approach. Using the presently obtained database, the isothermal sections at 400 ℃ and 650 ℃, the liquidus projection as well as the solidification path of the Ag-Cu-Co system are calculated. The reasonable agreement between the calculations and measurement indicates the accuracy of the thermodynamic description of the Ag-Cu-Co system obtained by extrapolation using the CALPHAD approach.

Key words： Ag-Cu-Co isothermal section liquidus projection CALPHAD solidification path

Received: 30 March 2022 Published: 15 November 2022

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TG113.14

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	Articles by authors
	MAO Xueliang
	LI Xiaojing
	LIU Shuhong
	DU Yong

Cite this article:

MAO Xueliang,LI Xiaojing,LIU Shuhong, et al. Thermodynamic investigation of the Ag-Cu-Co system[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 460-470.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022036 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I5/460

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