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Structural transformations in highly oriented seven modulated martensite Ni–Mn–Ga thin films on an Al2O3$\left( {11\bar 20} \right)$ substrate

Published online by Cambridge University Press:  19 September 2016

Amit Sharma ,
Sangeneni Mohan  and
Satyam Suwas
Amit Sharma
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India; and Center of Nano-Science and Engineering, Indian Institute of Science, Bangalore 560012, India
Sangeneni Mohan
Affiliation:
Center of Nano-Science and Engineering, Indian Institute of Science, Bangalore 560012, India
Satyam Suwas*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
a)Address all correspondence to this author. e-mail: satyamsuwas@materials.iisc.ernet.in
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Abstract

Highly oriented Ni–Mn–Ga thin film with multiple variants and room temperature orthorhombic martensite structure were prepared on a single crystalline Al2O3$\left( {11\bar 20} \right)$ substrate by DC magnetron sputtering. X-ray diffraction and rocking curve measurements reveal the film as (202)7M oriented with an excellent crystal quality (Δω = 1.8°). Spot-like pole figures indicate that the Ni–Mn–Ga film grows with a strong in-plane preferred orientation. An in-depth analysis of the measured pole figure reveals the presence of a retained austenite phase in the film. Two phase transformations, MS ∼345 K and TC ∼385 K, are observed and are attributed to first order structural transformation from cubic to orthorhombic, and second order phase transformation from ferromagnetic to paramagnetic, respectively. In situ high temperature x-ray diffraction measurements provide a clear indication of a thermally-induced martensite ↔ austenite reversible structural phase transformation in the film. The presence of martensite plates with seven modulated orthorhombic structure and adaptive nano-twins are some of the important microscopic features observed in the film with transmission electron microscopy investigations.

Keywords

Ni–Mn–GaThin filmstextureelectron microscopymagnetic shape memory effectphase transformation
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 19 , 14 October 2016 , pp. 3016 - 3026
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Copyright
Copyright © Materials Research Society 2016 

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