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Spinodal decomposition and martensitic transformation in Cu–Al–Mn shape memory alloy

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Abstract

Isothermal treatments at 413 K were performed in Cu–Al–Mn shape memory alloy samples, to study their effects on the martensitic transformation. This procedure, within the miscibility gap, produces spinodal decomposition. After each aging thermal treatment, martensitic transformation was monitored using Differential Scanning Calorimetry (DSC). Spinodal decomposition significantly changes the characteristics of the martensitic transition, reducing the transformed volume and modifying the critical temperatures. Furthermore, transformation hysteresis loop narrows as the volume fraction of the spinodal precipitates increases. Effects of thermal cycling through the martensitic transformation were studied in aged alloy samples. It was found that cycling produces critical temperatures changes, an increase in the transformed volume fraction, and a wider hysteresis loop. The observed results were discussed considering the interaction between spinodal precipitates and martensitic plates.

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Acknowledgements

This work has been carried out with the financial support of the CONICET, ANPCYT, SECAT-UNCPBA and CICPBA, Argentina. We are grateful for our fruitful discussions with our colleague Dra. A. Cuniberti and her critical reading of this paper’s manuscript. The authors acknowledge O. Toscano and E. Portalez for their contributions to the experimental work.

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Authors and Affiliations

  1. Instituto de Física de Materiales Tandil (IFIMAT) - UNCPBA, Pinto 399, Buenos Aires, 7000, Tandil, Argentina

    Diego Velazquez & Ricardo Romero

  2. Consejo Nacional de Investigaciones Científicas y Técnicas, Godoy Cruz 2290, C1425FQB, Buenos Aires, Argentina

    Diego Velazquez

  3. Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Calle 526 e/10 y 11, La Plata, Argentina

    Ricardo Romero

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  1. Diego Velazquez
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  2. Ricardo Romero
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Correspondence to Diego Velazquez.

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Velazquez, D., Romero, R. Spinodal decomposition and martensitic transformation in Cu–Al–Mn shape memory alloy. J Therm Anal Calorim 130, 2007–2013 (2017). https://doi.org/10.1007/s10973-017-6584-x

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  • DOI: https://doi.org/10.1007/s10973-017-6584-x

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