Abstract
Nanometre-sized freestanding alloy particles of B2-ordered AuCd with an average composition of Au 50Cd 50 (at.%) were synthesized by a wet-chemical process. The thermoelastic transformation behaviour with respect to particle size was investigated by means of calorimetry, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The martensitic transformation start temperature, M s, of nanometre-sized AuCd particles was determined to about 49 K and thus drastically lowered compared to AuCd bulk alloys. The lowering of the transformation temperatures is discussed on the basis of the obtained calorimetric data regarding the following two aspects: firstly, a reduction in the thermodynamic equilibrium temperature, T 0, and secondly, a suppression of the martensite formation due to the absence of pre-existing nucleation sites in the small AuCd particles. Moreover, it is demonstrated that due to a coarsening of the nanometre-sized alloy particles during a heat treatment, the martensitic transformation was shifted towards ambient temperature.
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