An entropy driven phase transformation in a Au43.3Cu31.8Al24.9 shape-memory alloy

Fiore, Gianluca; Battezzati, Livio

doi:10.1016/j.intermet.2011.06.021

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…These SMAs are promising for jewellery and biomedical applications, due to their inherent properties, such as biocompatibility, aesthetic value and chemical inertness. However, most investigations were performed on bulk alloys so far [1][2][3][4][5][6][7][8][9] and very few studies have been devoted to thin films [10,11].…”

Section: Introductionmentioning

confidence: 99%

Composition–Structure–Property Relations in Au35–68Cu49–15Al16–17 Shape Memory Thin Films

Buenconsejo

Pfetzing‐Micklich

Paulus

et al. 2016

Shap. Mem. Superelasticity

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The phase transformation behaviour, structure and mechanical properties of Au 35-68 Cu 49-15 Al 16-17 thin film shape memory alloys (SMA) have been investigated, with emphasis on the effects of Au content. The results revealed the underlying composition-structure-property relations. The thermal transformation hysteresis (DT) is wide (*55 K) for thin films with Au \50 at.%, while it is narrow (*15 K) for thin films with Au [50 at.%. This behaviour is correlated with the change in lattice constant of b-(Au-Cu-Al) (a b), suggesting a structural origin on the DT behaviour. The mechanical properties, such as hardness and elastic modulus, varied in the range of 2-4 and 70-120 GPa, respectively. The optimum Au composition range for tuning the functional property is between 43 and 55 at.% Au, where the least amount of non-transforming phases form and DT can be tailored between 55 K (43 at.% Au) and 17 K (55 at.% Au). This is important for the development and practical application of Au-Cu-Al based thin film SMA.

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