Abstract
Abstract Rapidly solidified alloys of Au-2wt%Ti, Au-3 wt% Ti and Au-5wt% Ti have been examined using transmission electron microscopy in order to investigate both the nature of structural order induced by rapid solidification and the evolution of long-range order during post-solidification heat-treatment. 〈1½0〉 special-point order is identified as a feature of the as-solidified microstructures and an intermediate state of order, incorporating both elements of the long-range-ordered (D1a) structure and elements of 〈1½0〉 special-point order, is observed to be stable up to the nucleation temperature of the equilibrium (D1a) Au4Ti phase in Au-3 wt% Ti. The evidence from electron diffraction patterns is discussed and interpreted by considering the nature and distribution of the three-dimensional diffuse streaking observed in zone-axis patterns from a variety of different orientations. The compositions examined demonstrate that these materials are members of the ‘special-point’ family of alloys and that incorpo...
Published Version
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