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.
Lattice parameters for four Cu–Si alloys containing 2.2, 4.3, 6.4 and 8.7 at.% Si in the solid‐solution range have been calculated in the temperature range 303–928 K. The lattice parameters increase slowly in a nonlinear manner with rise in temperature. The calculated linear thermal‐expansion coefficients (α) at room temperature increase with increasing solute concentration (Si) but decrease almost linearly with increasing temperature, the rate of decrease being higher for alloys with higher solute concentration. All the alloys have almost the same average α value (αav ~ 16.0 × 10−6 K−1), which is the value of α at the temperature interval 615–625 K for all the alloy compositions.
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