Calculation of the Mg-Gd-Y Alloy Equilibrium Phase Diagram and its Verification at 450°C

Abstract:

The Mg-Gd alloy, Mg-Y alloy equilibrium phase diagram has been characterized using the multiple phase equilibrium calculation software (Pandat) and the magnesium alloy thermodynamic database. The Mg-Gd and Mg-Y diffusion couples were made by the rivet method. According to the local balance principle, these diffusion couples were processed using an equalization treatment at 450 °C, followed by EDS analysis with a scanning electron microscope. The results show that a concentration gradient resulting from atomic diffusion is apparent in the Mg-Y and Mg-Gd diffusion layer, showing that the diffusion layers belong to different phases. There are 5 two-phase regions and 2 single phase regions in the Mg-Gd diffusion layer and 4 two-phase regions and 2 single phase regions in the Mg-Y diffusion layer. These results are consistent with the data from the phase equilibrium calculation. This research can provide experimental support for the Mg-Gd-Y three element alloy phase diagram calculation.

• Periodical: Applied Mechanics and Materials (Volumes 275-277)
• Pages: 1896-1903
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.275-277.1896
• Online since: January 2013
• Authors: Yong Chun Guo, Ying Ming Sang, Jian Ping Li, Zhong Yang
• Keywords: CALPHAD, Diffusion Couple Method, Pandat Software, Phase Composition, Phase Diagram of Verification

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