Dependency of the thermal and electrical conductivity on temperatures and compositions of Zn in the Al-Zn alloys


Erol H., Cadirli E., Erol E. A. , Gunduz M.

INTERNATIONAL JOURNAL OF CAST METALS RESEARCH, vol.32, no.2, pp.95-105, 2019 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 2
  • Publication Date: 2019
  • Doi Number: 10.1080/13640461.2018.1549190
  • Journal Name: INTERNATIONAL JOURNAL OF CAST METALS RESEARCH
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.95-105
  • Keywords: Thermal conductivity, electrical conductivity, temperature coefficients, Al-Zn Alloys, LIQUID SURFACE ENERGIES, SN, RESISTIVITY, ALUMINUM, PHASES, CD

Abstract

The variations of thermal conductivity (K) with temperature for Al-xZn (x = 5, 10, 20, 30, 50 and 60 wt. %) alloys were measured by using a radial heat flow furnace. The variations of electrical conductivity (sigma) of solid phases with temperature for the studied alloys were determined from the Wiedemann-Franz and Smith-Palmer equations by using the measured values of K from the plots of K. The thermal temperature coefficient (alpha(TTC)) and the electrical temperature coefficient (alpha(ETC)) were obtained. Dependency of the alpha(TTC) and Glut on the composition of Zn in the Al-Zn alloys was also investigated. According to the present experimental results, K of Al-Zn alloys linearly decrease with increasing temperatures up to the melting temperature for each composition and exponentially decrease with the increasing Zn content. On the other hand, the sigma of Al based Al-Zn alloys exponentially decrease with increasing temperature and Zn content.