Thermodynamic Re-Assessment of the Mn-La Binary System

Abstract:

In this work, eleven Mn-La alloys were investigated experimentally by means of thermal analysis. The temperatures of the invariant reactions in the Mn-La binary system were determined. To confirm whether the liquid miscibility gap exists in the Mn-La system, one key alloy (Mn₇₂La₂₈) was prepared and then checked by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS). Microstructure observation and composition analysis indicated the nonexistence of the liquid miscibility gap. Based on the experimental results obtained in the present work and the critical review of the available experimental data in the published literature, a set of self-consistent thermodynamic parameters for the Mn-La system was obtained using the CALPHAD method by thermodynamic optimization of the selected experimental data.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 21-26
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.21
• Online since: March 2016
• Authors: Chao Fan Zhu, Shi Dong Lin, Jiang Wang*, Mao Hua Rong, Guang Hui Rao, Huai Ying Zhou
• Keywords: CALPHAD, Mn-La System, Thermal Analysis, Thermodynamics

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