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Preparation, microstructure and thermal properties of MgBi alloys as phase change materials for thermal energy storage.

Author(s) : FANG D., SUN Z., LI Y., et al.

Type of article: Article

Summary

Comparing with Al-based phase change material, Mg-based phase change material is getting more and more attention due to its high corrosion resistance with encapsulation materials based on iron. This study focuses on the characterization of Mgsingle bond36%Bi, Mgsingle bond54%Bi and Mgsingle bond60%Bi (wt. %) alloys as phase change materials for thermal energy storage at high temperature. The phase compositions, microstructure and phase change temperatures were investigated by X-ray diffusion (XRD), electron probe micro-analysis (EPMA) and differential scanning calorimeter (DSC) analysis, respectively. The results indicates that the microstructure of Mgsingle bond36%Bi and Mgsingle bond54%Bi alloys are mainly composed of a-Mg matrix and a-Mg?+?Mg3Bi2 eutectic phases, Mgsingle bond60%Bi alloy are mainly composed of the Mg3Bi2 phase and a-MgMg3Bi2 eutectic phases. The melting enthalpies of Mgsingle bond36%Bi, Mgsingle bond54%Bi and Mgsingle bond60%Bi alloys are 138.2, 180.5 and 48.7?J/g, with the phase change temperatures of 547.6, 546.3 and 548.1?°C, respectively. The Mgsingle bond54%Bi alloy has the highest melting enthalpy in three alloys. The main reason may be that it has more proportion of a-Mg?+?Mg3Bi2 eutectic phases. The thermal expansion of three alloys increases with increasing temperature. The values of the thermal conductivity decrease with increasing Bi content. Besides, the activation energy of Mgsingle bond54%Bi was calculated by multiple DSC technology.

Details

  • Original title: Preparation, microstructure and thermal properties of MgBi alloys as phase change materials for thermal energy storage.
  • Record ID : 30017111
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 92
  • Publication date: 2016/01/05
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2015.09.090

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