TERNARY COMPOUNDS AND RELATIVE PHASE EQUILIBRIA IN THE Mg-RICH SIDE OF THE Mg-Zn-Ca SYSTEM

doi:10.3724/SP.J.1037.2010.00638

Acta Metall Sin

2011, Vol. 47

Issue (4): 385-390 DOI: 10.3724/SP.J.1037.2010.00638

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TERNARY COMPOUNDS AND RELATIVE PHASE EQUILIBRIA IN THE Mg-RICH SIDE OF THE Mg-Zn-Ca SYSTEM

LI Hongxiao, MA Qianqian, REN Yuping, JIANG Min, QIN Gaowu

Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819

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LI Hongxiao MA Qianqian REN Yuping JIANG Min QIN Gaowu. TERNARY COMPOUNDS AND RELATIVE PHASE EQUILIBRIA IN THE Mg-RICH SIDE OF THE Mg-Zn-Ca SYSTEM. Acta Metall Sin, 2011, 47(4): 385-390.

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Abstract The structure, composition range and phase equilibria of the ternary compounds in Mg-rich side of the Mg-Zn-Ca system have been investigated by SEM, EPMA, XRD and TEM. It has been shown that there exist two ternary compounds T₁ and T₂ in equilibrium with the Mg-based solid solution in the Mg-Zn-Ca system. T₁ phase is a linear compound with hexagonal structure, whose structure parameters decrease with the Zn content, i.e. a=0.995-0.945 nm, c=1.036-1.003 nm. Its composition region (atomic fraction, %) is Ca about 16, Zn 16.8-49.5 and balanced Mg. The composition region of the T₂ phase is Mg 27.1-29.3, Zn 62.1-64.4 and Ca 7.6-9.0. T₂ phase also has the hexagonal structure, whose structure parameters are a=1.475 nm and c=0.879 nm. At 335 ℃, the dissolution of Zn has not decreased the solubility of Ca in the α-Mg solid solution, but the solubility of Zn in the α-Mg solid solution increases with the dissolution of Ca, and the maximum solubility of Zn is 4.6. At 335 ℃, there are five three--phase fields consisting of α-Mg+Mg₂Ca+T₁, α-Mg+T₁+T₂, α-Mg+T₂+MgZn, MgZn+T₂+Mg₂Zn₃ and α-Mg+Mg₇Zn₃+MgZn in the Mg-Zn-Ca system, respectively.

Key words: Mg-Zn-Ca system ternary compound structure and composition phase equilibrium

Received: 29 November 2010

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TG111

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Supported by Key Project of National Natural Science Foundation of China (No.50731002) and Natural Science Foundation of Liaoning Province (No.20082030)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00638 OR https://www.ams.org.cn/EN/Y2011/V47/I4/385

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