Study of electrical and thermal properties of Al 100-x Li x

Abstract

The present work is a study of the electrical resistivity and thermal properties during continuous heating from room temperature up to 773 K of Al_100­x Li_x (x=0·5, 1, 2, 3, 6, and 8) alloys. From the electrical resistivity measurements at room temperature it is concluded that the resistivity increment of Al—Li alloys (in solid solution state) is proportional to the fractional constituents (Li and Al) as Δρ_all [νX cm]=94·10±0·13 [νX cm] c(1­c). In addition both the temperature coefficient of resistivity α_all and the relaxation time of the free electrons τ_all of the alloys diminish with increasing the solute Li concentration. Using the measured variation of the specific heat C _p and thermal diffusivity a as a function of temperature, the precipitation processes can be followed. Both tools were found to be sensitive for precipitation evolution.