Abstract
To a first approximation the addition of a solute (Ti) to a solvent (Fe) results in a change of lattice parameter which varies linearly with the atomic concentration of solute. However, it has been proposed by Raynor that in a transition-metal alloy system this ideal behaviour is not necessarily obeyed. A survey of published X-ray data for iron–titanium alloys shows that there is some doubt about the applicability of Vegard's law up to the limit of solid solubility of titanium in ferrite. The results of Zwell and Wriedt and Abrahamson and Lopata suggest a linear variation of lattice parameter with atomic concentration of titanium but their dilation coefficient (0·0031 Å/at.-%Ti) is not in agreement with Vegard's law (0·0041 Å/at.-%Ti) assuming a Ti = 3·2763 Å and a Fe = 2·8664 Å. In contrast, several authors all show a deviation from Vegard's law which is particularly marked at low titanium concentrations.
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