Physics – Condensed Matter – Materials Science
Scientific paper
2008-05-15
Physics
Condensed Matter
Materials Science
7 pages, 11 figures, 2 tables. Manuscript accpeted for publication in Acta Materialia
Scientific paper
The microstructure of a CoNiAl FSMA was determined by conventional transmission electron microscopy, electron diffraction studies together with advanced microscopy techniques and in-situ Lorentz microscopy. 10 to 60 nm sized rod-like precipitates of hcp $\epsilon$-Co were confirmed to be present by HRTEM. The orientation relationship between the precipitates and B2 matrix is described by the Burgers orientation relationship. The crystal structure of the martensite obtained after cooling is tetragonal L10 with a (1-11) twinning plane. The magnetic domain structure was determined during an in-situ cooling experiment using the Fresnel mode of Lorentz microscopy. While transformation proceeds from B2 austenite to L10 martensite, new domains are nucleated leading to a decrease in domain width, with the magnetization lying predominantly along a single direction. It was possible to completely describe the relationship between magnetic domains and crystallographic directions in the austenite phase though complications existed for the martensite phase.
Bartova B.
Chapman James N.
Ignacova S.
Schryvers Dominique
Wiese N.
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