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Article

Effect of Al Addition on Martensitic Transformation Stability and Microstructural and Mechanical Properties of CuZr Based Shape Memory Alloys

1
National Research Council, Institute of Condensed Matter Chemistry and Technologies for Energy, Via Previati 1/E, 23900 Lecco, Italy
2
Department of Chemistry, University of Pavia, Viale Taramelli 16, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Sergey Kustov and Alexander V. Shelyakov
Metals 2021, 11(7), 1141; https://doi.org/10.3390/met11071141
Received: 17 May 2021 / Revised: 24 June 2021 / Accepted: 1 July 2021 / Published: 20 July 2021
(This article belongs to the Special Issue Shape Memory Alloys 2020)
In this work, the effect of the Al content (x = 5, 10, and 15 at. %) on the martensitic transformation (MT) and microstructure and mechanical properties of Cu(50−x)Zr50Alx alloys was studied. The microstructure of the alloys was characterized at room temperature by means of scanning electron microscopy and X-ray diffraction. An increase in Al content reduces the amount of transforming CuZr phase, and consequently the secondary phase formation is favored. The evolution of the MT upon thermal cycling was investigated as a function of the Al content by differential scanning calorimetry. MT temperatures and enthalpies were found to be decreased when increasing the Al content. Al addition can induce a sudden, stable MT below 0 °C, while the binary alloy requires ten complete thermal cycles to stabilize. Finally, the mechanical properties were investigated through microhardness and compression testing. No linear dependence was found with composition. Hardness lowering effect was observed for 5–10 at. % of Al content, while the hardness was increased only for 15 at. % Al addition with respect to the binary alloy. Similarly, compressive response of the alloys showed behavior dependent on the Al content. Up to 10 at. % Al addition, the alloys indicate a superelastic response at room temperature, while higher Al content induced untimely failure. View Full-Text
Keywords: shape memory alloys; intermetallic; microstructure; differential scanning calorimetry; X-ray diffraction; mechanical testing shape memory alloys; intermetallic; microstructure; differential scanning calorimetry; X-ray diffraction; mechanical testing
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MDPI and ACS Style

Biffi, C.A.; Fiocchi, J.; Coduri, M.; Tuissi, A. Effect of Al Addition on Martensitic Transformation Stability and Microstructural and Mechanical Properties of CuZr Based Shape Memory Alloys. Metals 2021, 11, 1141. https://doi.org/10.3390/met11071141

AMA Style

Biffi CA, Fiocchi J, Coduri M, Tuissi A. Effect of Al Addition on Martensitic Transformation Stability and Microstructural and Mechanical Properties of CuZr Based Shape Memory Alloys. Metals. 2021; 11(7):1141. https://doi.org/10.3390/met11071141

Chicago/Turabian Style

Biffi, Carlo A., Jacopo Fiocchi, Mauro Coduri, and Ausonio Tuissi. 2021. "Effect of Al Addition on Martensitic Transformation Stability and Microstructural and Mechanical Properties of CuZr Based Shape Memory Alloys" Metals 11, no. 7: 1141. https://doi.org/10.3390/met11071141

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