Microstructure characterization of the non-modulated martensite in Ni-Mn-Ga alloy

Journal Article · Sun Jun 15 00:00:00 EDT 2008 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2007.06.010· OSTI ID:21140731

Bennett, J C ^[1]; Gharghouri, M A ^[2]; Chen, J ^[1]; Hyatt, C V ^[3]; Mailman, N ^[1]

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1. Department of Physics, Acadia University, Wolfville, NS (Canada)
2. National Research Council Canada, Chalk River Laboratories, Chalk River, ON (Canada)
3. Defence Research and Development Canada-Atlantic, Dartmouth, NS (Canada)

The microstructure of the non-modulated martensite in a Ni-Mn-Ga alloy has been characterized in detail by conventional transmission electron microscopy. Bright field images show that the martensite exhibits an internal substructure consisting of a high density of narrow twins. Using electron diffraction, it is found that the martensite has a tetragonal crystal structure. The lattice correspondence between the parent phase and the non-modulated martensite is investigated. Furthermore, the four twinning elements describing the microtwinning have been graphically and quantitatively determined. The results indicate that the microtwinning within the non-modulated martensite belongs to the compound type.

• OSTI ID: 21140731
• Journal Information: Materials Characterization, Vol. 59, Issue 6; Other Information: DOI: 10.1016/j.matchar.2007.06.010; PII: S1044-5803(07)00243-4; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
ELECTRON DIFFRACTION
GALLIUM ALLOYS
MANGANESE ALLOYS
MARTENSITE
MICROSTRUCTURE
NICKEL ALLOYS
PHASE TRANSFORMATIONS
TRANSMISSION ELECTRON MICROSCOPY
TWINNING