期刊
ACTA MATERIALIA
卷 71, 期 -, 页码 164-175出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.02.029
关键词
Magnesium; Anisotropic diffusion; Phase diagram; Thermodynamic modeling; Rare earth
资金
- General Motors of Canada and the Natural Sciences and Engineering Research Council of Canada (NSERC)
- National Research Foundation (NRF)
- Ministry of Education, Science and Technology [2011-0013839]
- National Research Foundation of Korea [2011-0013839] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Diffusion couple experiments for the Mg-Gd and Mg-Y systems were performed with Mg single crystals to investigate the anisotropic diffusion behavior of Gd and Y in hexagonal close packed (hcp) Mg at temperatures between 703 and 803 K (430 and 530 C). Diffusion coefficients for both Gd and Y along the basal plane of hcp Mg are approximately three times higher than those along the normal direction of the basal plane. The impurity diffusion coefficients of both Gd and Y in hcp Mg are lower than the self-diffusion of Mg and impurity diffusions of Al and Zn by about one order of magnitude. Growth constants and inter-diffusion coefficients of the intermediate phases for both systems were determined. Accurate thermodynamic modeling of the Mg Y and Mg Gd systems were also carried out based on the phase diagram data obtained from the present diffusion couple experiments and available literature data. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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