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Computer-aided cooling curve thermal analysis and microstructural characterization of Mg-Gd-Y-Zr system alloys
J. L. Li; R. S. Chen; Y. Q. Ma; W. Ke
2014
Source PublicationThermochimica Acta
ISSN0040-6031
Volume590Pages:232-241
AbstractThe solidification pathways of Mg-Gd-Y-Zr (GW) alloys with various Y and Gd concentrations were investigated by using a computer-aided cooling curve thermal analysis system, and the solidification microstructure and phase constitution of the investigated alloys were characterized by means of SEM, EDX, and XRD. The results show that the solidification microstructures of GW alloys are mainly composed of alpha-Mg matrix and eutectic Mg-24(Gd,Y)(5) phase, which forms through a univariant reaction: liq. -> alpha-Mg + Mg-24(Gd,Y)(5) during alloy solidification. Based upon thermal analysis results, the hot tearing susceptibility (HTS) and semi-solid formability of Mg-Gd-Y-Zr alloys were evaluated as well. It is predicted that the HTS of GW alloys first increases and then decreases with increasing Gd, Y content. Moreover, the increasing Gd, Y content also decreases the temperature sensitivity of solid fraction, -df(s)/dT, of GW alloys, and thus, improves the semi-solid formability of these alloys. (C) 2014 Elsevier B.V. All rights reserved.
description.department[li, jilin ; chen, rongshi ; ma, yuequn ; ke, wei] chinese acad sci, inst met res, grp magnesium & their applicat, shenyang 110016, peoples r china. ; chen, rs (reprint author), chinese acad sci, inst met res, grp magnesium & their applicat, 62 wencui rd, shenyang 110016, peoples r china. ; rschen@imr.ac.cn
KeywordMg-gd-y-zr Alloy Thermal Analysis Solidification Pathways Phase Constitution Thermodynamic Predictions Solidification Pathways Mechanical-properties Phases Cast Zn Si
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73271
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
J. L. Li,R. S. Chen,Y. Q. Ma,et al. Computer-aided cooling curve thermal analysis and microstructural characterization of Mg-Gd-Y-Zr system alloys[J]. Thermochimica Acta,2014,590:232-241.
APA J. L. Li,R. S. Chen,Y. Q. Ma,&W. Ke.(2014).Computer-aided cooling curve thermal analysis and microstructural characterization of Mg-Gd-Y-Zr system alloys.Thermochimica Acta,590,232-241.
MLA J. L. Li,et al."Computer-aided cooling curve thermal analysis and microstructural characterization of Mg-Gd-Y-Zr system alloys".Thermochimica Acta 590(2014):232-241.
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