In-situ high-energy x-ray diffuse-scattering study of the phase transition of Ni{sub 2}MnGa single crystal under high magnetic field.

Journal Article · Sat May 01 04:00:00 EDT 2010 · Metall. Mater. Trans. A

DOI:https://doi.org/10.1007/s11661-009-0108-7· OSTI ID:975461

Wang, G; Wang, Y -D; Ren, Y; Li, D; Liu, Y; Liaw, P

The defects-related microstructural features connected to the premartensitic and martensitic transition of a Ni{sub 2}MnGa single crystal under a high magnetic field of 50 KOe applied along the [1{bar 1}0] crystallographic direction of the Heusler phase were studied by the in-situ high-energy X-ray diffuse-scattering experiments on the high energy synchrotron beam line 11-ID-C of APS and thermomagnetization measurements. Our experiments show that a magnetic field of 50 KOe applied along the [1{bar 1}0] direction of the parent Heusler phase can promote the premartensitic transition of Ni{sub 2}MnGa single crystal, but puts off martensite transition and the reverse transition. The premartensitic transition temperature (T{sub PM}) increases from 233 to 250 K (-40 to -23 C). The martensite transition start temperature (M{sub s}) decreases from 175 to 172 K (-98 to -101 C), while the reverse transition start temperature (A{sub s}) increases from 186 to 189 K (-87 to -84 C). The high magnetic field leads to a rapid rearrangement of martensite variants below the martensite transition finish temperature (M{sub f}). The real transition process of Ni{sub 2}MnGa single crystal under the high magnetic field was in-situ traced.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF; National Natural Science Foundation of China; 111 Project of China
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 975461
• Report Number(s): ANL/XSD/JA-65411
• Journal Information: Metall. Mater. Trans. A, Journal Name: Metall. Mater. Trans. A Journal Issue: 5 ; May 2010 Vol. 41A; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
DIFFUSE SCATTERING
MAGNETIC FIELDS
MARTENSITE
MONOCRYSTALS
SYNCHROTRONS
TRANSITION TEMPERATURE