Experimental investigation and thermodynamic description of the Mg–Y–Zr system
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The Mg–Y–Zr system was studied via experimental investigation and thermodynamic modeling. Four diffusion couples and four key alloys of the Mg–Y–Zr system at 500 °C were prepared. The phase relations of the Mg–Y–Zr system were investigated by means of X-ray diffraction, scanning electron microscopy, and electron probe microanalysis. No ternary compound was found at 500 °C. The solubility of (αZr) in the Mg–Y intermetallics, i.e., Mg24Y5, Mg2Y and MgY, was determined to be negligible. The differential scanning calorimetry measurement was performed on the Mg–Y–Zr alloys to obtain the phase transition temperature. The present thermodynamic calculations of the Mg–Y–Zr system matched well with the experimental data. The presently established Mg–Y–Zr phase diagram can offer a better understanding of the recent processing technique of creep-resistant magnesium alloys.
KeywordsMagnesium Alloy Isothermal Section Phase Transition Temperature Diffusion Couple Ternary Compound
The financial support from the National Basic Research Program of China (Grant No. 2011CB610401), the National Natural Science Foundation of China (Grant Nos. 51371199 and 51101172), and Thermo-Calc Software AB under the Mg Alloy Database Project is greatly acknowledged.
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