Relationship between grain size and thermal hysteresis of martensitic transformations in Cu-based shape memory alloys

P La Roca,L Isola,Ph Vermaut,J Malarría

doi:10.1016/j.scriptamat.2017.03.016

Relationship between grain size and thermal hysteresis of martensitic transformations in Cu-based shape memory alloys

P La Roca, L Isola + Show 2 more

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https://doi.org/10.1016/j.scriptamat.2017.03.016

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Journal: Scripta materialia	Publication Date: May 10, 2017
Citations: 34	License type: cc-by-nc-sa

Affiliation: National University of Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas, Institute of Physics Rosario, Université Paris Cité, Sorbonne Université, Institut de Recherche de Chimie Paris, Chimie ParisTech, Université Paris Sciences et Lettres, French National Centre for Scientific Research

#Cu-based Shape Memory Alloys #Rapid Solidification Techniques + Show 8 more

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Abstract

The effect of grain size on thermal hysteresis is studied in ribbons and thin strips obtained by rapid solidification techniques. Results show a strong increase of the hysteresis width when the grain size is below ∼100μm. This effect is attributed to frictional work spent to accommodate the different martensitic variants in a zone close to grain boundaries, which constitutes an energy barrier proportional to the grain boundary area. A model for describing this effect based on thermodynamics and fitted experimental data is proposed.

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