An X-ray determination of the thermal expansion of α-phase Cu–Al alloys at high temperature

Abstract

The lattice expansion of four Cu-A1 alloys in the solidsolution range containing 3. 7, 6.7, 12.3 and 18.4 at.% AI have been determined by X-ray diffraction in the temperature range 303-923K using a Unicam 19cm hightemperature powder camera. In all cases the measured lattice .parameters have been found to increase non-linearly with increasing temperature, from which the linear thermal expansion coefficients (~) have been determined. The values have been found to decrease with increasing temperature; but the average ~ values increase slowly with the increase of A1 concentration.

High-resolution time-of-flight measurements of the lattice parameter and thermal expansion of the icosahedral phase Al62Cu25.5Fe12.5

“…This coefficient is to be compared to the coefficient of the icosahedral phase AIPdMn (Tsai et aL, 1992) measured by the length variation: = 14.6 x 10 -6 K-1 at room temperature. The thermal coefficient is temperature dependent; its variation is compared with those of aluminium, copper and a set of copper-aluminium alloys (Pradhan & De, 1988) in Fig. 3.…”