In-situ high-energy x-ray diffuse-scattering study of the phase transition of Ni{sub 2}MnGa single crystal under high magnetic field.
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 Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); National Natural Science Foundation of China (NNSFC); 111 Project of China
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 975461
- Report Number(s):
- ANL/XSD/JA-65411; MMTAEB; TRN: US1002477
- Journal Information:
- Metall. Mater. Trans. A, Vol. 41A, Issue 5 ; May 2010; ISSN 1073-5623
- Country of Publication:
- United States
- Language:
- ENGLISH
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