New Au–Cu–Al thin film shape memory alloys with tunable functional properties and high thermal stability

Buenconsejo, Pio John S.; Ludwig, Alfred

doi:10.1016/j.actamat.2014.11.035

Cited by 21 publications

(7 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A high e/a ratio stabilizes the b-(Au-Cu-Al) phase, which means that the martensitic transition is shifted towards lower temperatures. This trend was confirmed in the thin film combinatorial investigation of the Au-Cu-Al system [11]. Furthermore, the martensitic transformation start (M s ) and reverse transformation finish (A f ) temperatures decrease with increasing Al content.…”

Section: Introductionsupporting

confidence: 57%

“…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%

“…Recently, a comprehensive study of the Au-Cu-Al system by thin film combinatorial synthesis and highthroughput experimentation revealed a wide range of new potential thin film SMA compositions [11]. It was found that the phase transformation properties of b-(Au-Cu-Al) can be tuned over a large composition space.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Buenconsejo

Pfetzing‐Micklich

Paulus

et al. 2016

Shap. Mem. Superelasticity

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Buenconsejo

Pfetzing‐Micklich

Paulus

et al. 2016

Shap. Mem. Superelasticity

Self Cite

View full text Add to dashboard Cite

show abstract

“…There is also an investigation of other types of elastocaloric materials. For instance, Buenconsejo and Ludwig (2015) reported on new thin-film shape-memory alloys based on Au-Cu-Al.…”

Section: Elastocaloric Materialsmentioning

confidence: 99%

Present and future caloric refrigeration and heat-pump technologies

Kitanovski

Plaznik

Tomc

et al. 2015

International Journal of Refrigeration

233

120

View full text Add to dashboard Cite

“…The fatigue degrades physical, mechanical properties of SMAs, especially the SME and SE, and finally leads to failure7. Therefore, the “reversibility”, the ability to pass back and forth through the phase transformation many times without degradation of properties, is critical and extensive research has focused on reducing hysteresis in order to improve the “reversibility” of SMAs3410111213.…”

mentioning

confidence: 99%

Design of High Temperature Ti-Pd-Cr Shape Memory Alloys with Small Thermal Hysteresis

Xue

Yuan

Zhou

et al. 2016

Sci Rep

View full text Add to dashboard Cite

The large thermal hysteresis (ΔT) during the temperature induced martensitic transformation is a major obstacle to the functional stability of shape memory alloys (SMAs), especially for high temperature applications. We propose a design strategy for finding SMAs with small thermal hysteresis. That is, a small ΔT can be achieved in the compositional crossover region between two different martensitic transformations with opposite positive and negative changes in electrical resistance at the transformation temperature. We demonstrate this for a high temperature ternary Ti-Pd-Cr SMA by achieving both a small ΔT and high transformation temperature. We propose two possible underlying physics governing the reduction in ΔT. One is that the interfacial strain is accommodated at the austenite/martensite interface via coexistence of B19 and 9R martensites. The other is that one of transformation eigenvalues equal to 1, i.e., λ2 = 1, indicating a perfect coherent interface between austenite and martensite. Our results are not limited to Ti-Pd-Cr SMAs but potentially provide a strategy for searching for SMAs with small thermal hysteresis.

show abstract

New Au–Cu–Al thin film shape memory alloys with tunable functional properties and high thermal stability

Cited by 21 publications

References 36 publications

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

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

Present and future caloric refrigeration and heat-pump technologies

Design of High Temperature Ti-Pd-Cr Shape Memory Alloys with Small Thermal Hysteresis

Contact Info

Product

Resources

About