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Coexisting Multiple Martensites in Ni57-xMn21+xGa22 Ferromagnetic Shape Memory Alloys: Crystal Structure and Phase Transition

Journal Article · · Metals
DOI:https://doi.org/10.3390/met11101534· OSTI ID:1841199
 [1];  [2];  [3];  [2]
  1. Hunan Inst. of Engineering, Xiangtan (China)
  2. Univ. of Science and Technology Beijing (China)
  3. Northeastern Univ., Shenyang (China)
A comprehensive study of the crystal structure and phase transition as a function of temperature and composition in Ni57–xMn21+xGa22 (x = 0, 2, 4, 5.5, 7, 8) (at. %) magnetic shape memory alloys was performed by a temperature-dependent synchrotron X-ray diffraction technique and transmission electron microscopy. A phase diagram of this Ni57–xMn21+xGa22 alloy system was constructed. The transition between coexisting multiple martensites with monoclinic and tetragonal structures during cooling was observed in the Ni51.5Mn26.5Ga22 (x = 5.5) alloy, and it was found that 5M + 7M multiple martensites coexist from 300 K to 160 K and that 5M + 7M + NM multiple martensites coexist between 150 K and 100 K. The magnetic-field-induced transformation from 7M martensite to NM martensite at 140 K where 5M + 7M + NM multiple martensites coexist before applying the magnetic field was observed by in situ neutron diffraction experiments. The present study is instructive for understanding the phase transition between coexisting multiple martensites under external fields and may shed light on the design of novel functional properties based on such phase transitions.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1841199
Alternate ID(s):
OSTI ID: 1844755
Journal Information:
Metals, Journal Name: Metals Journal Issue: 10 Vol. 11; ISSN 2075-4701
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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