Abstract
Abstract The β (body centered cubic) phase in Au 7 Cu 5 Al 4 alloys is known to give a displacive martensitic transformation associated with shape memory effect and an interesting surface texture known as ‘Spangold’, as well being considered as a good candidate for biomedical implant applications due to gold being biocompatible and radio-opaque. Studies have been carried out on the martensitic transformation and precursor phenomena in three Au–Cu–Al alloys near Au 7 Cu 5 Al 4 composition, for the temperature ranging from 200 to −100 °C by means of dynamic mechanical analysis. Frequency dependent internal friction peaks have been observed for both cooling and heating processes in two of these alloys, which are associated with the glass behavior. The glassy state in Au 7 Cu 5 Al 4 alloys is a type of precursor phenomenon followed by martensitic transformation. Different defects or phases resulting from the different composition are believed to play a key role in the manifestation of a glass behavior.
Published Version
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