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Title: Extended investigation of intermartensitic transitions in Ni-Mn-Ga magnetic shape memory alloys: A detailed phase diagram determination

Martensitic transitions in shape memory Ni-Mn-Ga Heusler alloys take place between a high temperature austenite and a low temperature martensite phase. However, intermartensitic transformations have also been encountered that occur from one martensite phase to another. To examine intermartensitic transitions in magnetic shape memory alloys in detail, we carried out temperature dependent magnetization, resistivity, and x-ray diffraction measurements to investigate the intermartensitic transition in Ni{sub 50}Mn{sub 50–x}Ga{sub x} in the composition range 12≤x≤25 at. %. Rietveld refined x-ray diffraction results are found to be consistent with magnetization and resistivity data. Depending on composition, we observe that intermartensitic transitions occur in the sequences 7M→L1{sub 0}, 5M→7M, and 5M→7M→L1{sub 0} with decreasing temperature. The L1{sub 0} non-modulated structure is most stable at low temperature.
Authors:
;  [1] ;  [2] ;  [3] ; ;  [4]
  1. Muğla Üniversitesi, Fizik Bölümü, 48000 Muğla (Turkey)
  2. Dipartimento Chimica GIAF, Universita di Parma, Parco Area delle Scienze 17/A, 43010 Parma (Italy)
  3. IMEM-CNR, Parco Area delle Scienze 37/A, 43010 Parma (Italy)
  4. Faculty of Physics and Center for Nanointegration (CENIDE), Universität Duisburg-Essen, D-47048 Duisburg (Germany)
Publication Date:
OSTI Identifier:
22259293
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 18; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AUSTENITE; HEUSLER ALLOYS; MAGNETIZATION; MARTENSITE; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; SHAPE MEMORY EFFECT; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION