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SUMMARY:Avalanche Dynamics in Martensitic Transitions and its influence on
  Caloric Effects - Prof. Eduard Vives\, Dept. Física de la Matèria Conde
 nsada\, Universitat de Barcelona\, Catalonia
DTSTART:20220616T140000Z
DTEND:20220616T150000Z
UID:TALK174677@talks.cam.ac.uk
CONTACT:Emilie Ringe
DESCRIPTION: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 ea
 sy compared to the alternatives based on electric or magnetic fields.\nFor
  the case of metallic alloys exhibiting martensitic transitions\, it is kn
 own that the dynamics proceeds by avalanches: its discontinuous in time an
 d highly inhomogeneous. This can have deep implications in the design of f
 uture devices\, especially if one is interested in small size and high fre
 quency actuators.\n\nIn this seminar I will review some recent experimenta
 l results on the dynamics of martensitic transitions in Cu-based alloys\, 
 obtained by Acoustic Emission detection\, optical imaging of strain maps a
 nd infrared imaging.  These techniques allow to track the position of the 
 moving interface fronts and the corresponding heat sinks and sources.\n\n\
 nReferences:\n\nBenoît Blaysat\, Xavier Balandraud\, Michel Grédiac\, Ed
 uard Vives\, Noemi Barrera\, and Giovanni Zanzotto\,\nConcurrent tracking 
 of strain and noise bursts at ferroelastic phase fronts\,\nCommunications 
 Materials 1\, 3 (2020).\n\nLucia Ianniciello\,   Michela Romanini\,   Llu
 ís Mañosa\,   Antoni Planes\,   Kurt Engelbrecht\, and   Eduard Vives\, 
  \nTracking the dynamics of power sources and sinks during the martensitic
  transformation of a Cu–Al–Ni single crystal\,\nAppl. Phys. Lett. 116\
 , 183901 (2020).\n\nGuillem Capellera\,   Lucia Ianniciello\,   Michela Ro
 manini\, and   Eduard Vives\,\nHeat sink avalanche dynamics in elastocalor
 ic Cu–Al–Ni single crystal detected by infrared calorimetry and Gaussi
 an filtering\,\nAppl. Phys. Lett. 119\, 151905 (2021).\n
LOCATION:Goldsmith's 2 &amp\; https://us06web.zoom.us/j/81688365420?pwd=b3
 RpdHgxNVhWbWQrbXluMUxYNWVtQT09 Meeting ID: 816 8836 5420 Passcode: 047859
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