Thermal Conductivity of Cu-Cr-Zr-Ti Alloy in the Temperature Range of 300–873 K

Abstract

In the present investigation, thermal conductivity of Cu-Cr-Zr-Ti alloy was determined as the product of the specific heat (C p ), thermal diffusivity (α), and density (ρ) in the temperature range of 300-873 K. The experimental results showed that the thermal conductivity of the alloy increased with increase in temperature up to 873 K and the data was accurately modeled by a linear equation. For comparison, thermal conductivity was also evaluated for OFHC copper in the same temperature range. The results obtained were discussed using electrical conductivity and hardness measurements made at room temperature. Transmission electron microscopy (TEM) was done to understand the microstructural changes occurring in the sample after the test. Wiedemann-Franz-Lorenz law was employed for calculating electronic and phonon thermal conductivity using electrical conductivity. On the basis of studies conducted it was deduced that in situ aging may be one of the reasons for the increase in thermal conductivity with temperature for Cu-Cr-Zr-Ti alloy.

High temperature tribological response of Fe-2Cu-0.8C-CaF2 self-lubricating composites at high speeds

“…35 k p was estimated using Maxwell's equation (equation (2)), 37,38 by taking vol. % of pin material constituents and their thermal conductivity (in W/mK) at 500 °C pin heating (for Fe-0.8C is 37, 39 Cu is 360, 40 CaF 2 is 3.4). 41 where k m is the thermal conductivity of matrix (BM), k r is the thermal conductivity of CaF 2 , and ϕ is the volume fraction of CaF 2 .…”

“…35 k p was estimated using Maxwell's equation (equation ( 2)), 37,38 by taking vol. % of pin material constituents and their thermal conductivity (in W/mK) at 500 °C pin heating (for Fe-0.8C is 37, 39 Cu is 360, 40 CaF 2 is 3.4). 41…”

The Physical Properties Of Aluminium-7xxx Series Alloys Produced By Powder Metallurgy Method

“…7 and 8; the low thermal conductivity was obtained on the Alumix-431-1 alloy compacted on the low pressure and temperature and it was recommended that low thermal conductivity was meant the having a higher content of solute elements in the α-Al matrix (0.260W/Km at 6.19 K). It was also observed the low thermal conductivity on Alumix-431-1 samples according to other alloys considering dominating via grain boundary and impurity scattering and considered the low thermal conductivity due to the occurring of heat transfer, embedded alloying elements the movements of free electrons that are primary source in order to transport heat in metals and decreasing free path [50,51]. The decreasing thermal conductivity is caused to the decreasing of the electronic thermal conductivity according to Wiedemann-Franz Law (see Fig 7).…”