Journal Article

PUBDB-2022-05117

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png What is the speed limit of martensitic transformations?

Schwabe, S. ; Luenser, K. ; Schmidt, D. ; Nielsch, K. ; Gaal, P. ; Faehler, S. (Corresponding author)Extern*

2022
Taylor & Francis Abingdon

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Please use a persistent id in citations: doi:10.1080/14686996.2022.2128870  doi:10.3204/PUBDB-2022-05117

Report No.: I-20200170

Abstract: Structural martensitic transformations enable various applications, which range from high stroke actuation and sensing to energy efficient magnetocaloric refrigeration and thermomagnetic energy harvesting. All these emerging applications benefit from a fast transformation, but up to now their speed limit has not been explored. Here, we demonstrate that a thermoelastic martensite to austenite transformation can be completed within 10 ns. We heat epitaxial Ni-Mn-Ga films with a nanosecond laser pulse and use synchrotron diffraction to probe the influence of initial temperature and overheating on transformation rate and ratio. We demonstrate that an increase in thermal energy drives this transformation faster. Though the observed speed limit of 2.5 × 10$^{27}$ (Js)$^1$ per unit cell leaves plenty of room for further acceleration of applications, our analysis reveals that the practical limit will be the energy required for switching. Thus, martensitic transformations obey similar speed limits as in microelectronics, as expressed by the Margolus – Levitin theorem.

Note: OpenAccess

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Dresden-Rossendorf e. V. (HZDR)
3. Leibniz-Institut für Kristallzüchtung (IKZ)
4. TU Dresden (UDresden)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P23 (PETRA III)

Appears in the scientific report 2022

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