Avalanche Dynamics in Martensitic Transitions and its influence on Caloric Effects

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• Prof. Eduard Vives, Dept. Física de la Matèria Condensada, Universitat de Barcelona, Catalonia
• Thursday 16 June 2022, 15:00-16:00
• Goldsmith's 2 & https://us06web.zoom.us/j/81688365420?pwd=b3RpdHgxNVhWbWQrbXluMUxYNWVtQT09 Meeting ID: 816 8836 5420 Passcode: 047859.

If you have a question about this talk, please contact Emilie Ringe.

Solids with structural first-order phase transitions are being considered as candidates for elastocaloric refrigeration due to its large latent heat and the fact that applying mechanical stress is relatively easy compared to the alternatives based on electric or magnetic fields. For the case of metallic alloys exhibiting martensitic transitions, it is known that the dynamics proceeds by avalanches: its discontinuous in time and highly inhomogeneous. This can have deep implications in the design of future devices, especially if one is interested in small size and high frequency actuators.

In this seminar I will review some recent experimental results on the dynamics of martensitic transitions in Cu-based alloys, obtained by Acoustic Emission detection, optical imaging of strain maps and infrared imaging. These techniques allow to track the position of the moving interface fronts and the corresponding heat sinks and sources.

References:

Benoît Blaysat, Xavier Balandraud, Michel Grédiac, Eduard Vives, Noemi Barrera, and Giovanni Zanzotto, Concurrent tracking of strain and noise bursts at ferroelastic phase fronts, Communications Materials 1, 3 (2020).

Lucia Ianniciello, Michela Romanini, Lluís Mañosa, Antoni Planes, Kurt Engelbrecht, and Eduard Vives, Tracking the dynamics of power sources and sinks during the martensitic transformation of a Cu–Al–Ni single crystal, Appl. Phys. Lett. 116, 183901 (2020).

Guillem Capellera, Lucia Ianniciello, Michela Romanini, and Eduard Vives, Heat sink avalanche dynamics in elastocaloric Cu–Al–Ni single crystal detected by infrared calorimetry and Gaussian filtering, Appl. Phys. Lett. 119, 151905 (2021).

This talk is part of the Department of Materials Science & Metallurgy Seminar Series series.

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• Department of Materials Science & Metallurgy Seminar Series
• Goldsmith's 2 & https://us06web.zoom.us/j/81688365420?pwd=b3RpdHgxNVhWbWQrbXluMUxYNWVtQT09 Meeting ID: 816 8836 5420 Passcode: 047859
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