Paper Titles
Crystal Structures of Modulated Martensitic Phases of FSM Heusler Alloys
p.105
Magnetic Microstructure Analysis of Ferromagnetic Shape Memory Alloys and Related Compounds
p.117
Polycrystalline Ni-Mn-Ga as a Potential Material for Magnetically Driven Actuators
p.129
Metamagnetic Shape Memory Effect and Magnetic Properties of Ni-Mn Based Heusler Alloys
p.139
Reverse Magnetostructural Transitions by Co and In Doping NiMnGa Alloys: Structural, Magnetic, and Magnetoelastic Properties
p.151
Magnetic Phase Diagram of the Ferromagnetic Shape Memory Alloys Ni2MnGa1-xCux
p.165
Effects of Surface Pinning, Locking and Adaption of Twins on the Performance of Magnetic Shape-Memory Alloys
p.177
Long-Term Cyclic Loading of 10M Ni-Mn-Ga Alloys
p.203
Surface Study of Ni2MnGa(100)
p.215

Reverse Magnetostructural Transitions by Co and In Doping NiMnGa Alloys: Structural, Magnetic, and Magnetoelastic Properties

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Abstract:

We review the composition dependence of the structural and magnetic properties of the Co-doped Ni–Mn–Ga Ferromagnetic Shape Memory Alloy around the Mn-rich composition Ni50Mn30Ga20. The presence of Co affects the critical temperatures and alters the exchange interactions of martensite and austenite to different extents; by varying the composition it is possible to tune the critical temperatures and to induce a “paramagnetic gap” between the magnetically ordered martensite and magnetic austenite, thus giving rise to a reverse magnetostructural transformation. The magnetic and structural properties display noticeable discontinuities across the martensitic transformation: remarkable values of the saturation magnetization jump at the transformation (DM), of the field dependence of the martensitic transformation temperature (dTM/dH), and of the crystalline volume change (DV/V) are reported, and are considerably enhanced by additional Indoping of the quaternary alloy. These properties give rise to a remarkable phenomenology which is of interest for multifunctional applications; magnetic superelasticity and high values of reversible strain are found.

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Periodical:

Materials Science Forum (Volume 684)

Pages:

151-163

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.684.151

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Online since:

May 2011

Authors:

Franca Albertini, Simone Fabbrici, Antonio Paoluzi, Jiri Kamarad, Zdenek Arnold, Lara Righi, Massimo Solzi, Giacomo Porcari, Chiara Pernechele, David Serrate, Pedro Algarabel

Keywords:

Heusler Alloy, Magnetic Shape Memory, Martensitic Transformation (MT), Ni-Mn-Ga, Reverse Transformation, Superelastic Alloy

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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