Affiliation:
1. Hunan Institute of Science and Technology
Abstract
The effects of modification, electromagnetic stirring and compound treatment (modification and electromagnetic stirring) on the microstructure and thermal stability of Al-13% Si alloy are experimentally investigated. The results show that the three melt treatments can change the microstructure of the alloy. The modification has obvious refining effect on primary silicon and eutectic silicon grains, electromagnetic stirring has refining effect on primary silicon grains, and eutectic silicon grains appear coarsening phenomenon. The latent heat is obviously decreased by electromagnetic stirring, while the latent heat is increased by modification. Refining eutectic silicon grains will increase the latent heat of phase transformation of the alloy. When 560 °C remains unchanged, the melting temperature of the alloy generally decreases with the increase of holding time, but fluctuates, with a decrease of 7 °C. The latent heat decreases with the increase of constant temperature time, and the decrease amplitude reaches 8.4%.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference21 articles.
1. J.Q. Sun, R.Y. Zhang, Review of thermal energy storage with metal phase change materials, Mater. Rev. 19 (2005) 99–101.
2. Review on storage materials and thermal performance enhancement techniques for high temperature phase change thermal storage systems;Liu;Renewable and Sustainable Energy Reviews
3. Technical Challenges and Opportunities for Concentrating Solar Power With Thermal Energy Storage;Stekli;Journal of Thermal Science and Engineering Applications,2013
4. C. Birchenall, M. Telkes, Thermal storage in metals, Sharing the Sun, Solar Technology in the Seventies, Winnipeg, 1976 138–154.
5. Heat capacities and latent heats of LiNO3, NaNO3, and KNO3;Takahashi;International Journal of Thermophysics