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Nano- and Microcrystal Investigations of Precipitates, Interfaces and Strain Fields in Ni-Ti-Nb by Various TEM Techniques

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Abstract:

In the present contribution several advanced electron microscopy techniques are employed in order to describe chemical and structural features of the nano- and microstructure of a Ni45.5Ti45.5Nb9 alloy. A line-up of Nb-rich nano-precipitates is found in the Ni-Ti-rich austenite of as-cast material. Concentration changes of the matrix after annealing are correlated with changes in the transformation temperatures. The formation of rows and plates of larger Nb-rich precipitates and particles is described. The interaction of a twinned martensite plate with a Nb-rich nano-precipitate is discussed and the substitution of Nb atoms on the Ti-sublattice in the matrix is confirmed.

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Periodical:

Materials Science Forum (Volumes 738-739)

Pages:

65-71

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.738-739.65

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Cite this paper

Online since:

January 2013

Authors:

Dominique Schryvers, Hui Shi, Gerardo T. Martinez, Sandra Van Aert, Jan Frenzel, Jan Van Humbeeck

Keywords:

FIB/SEM, HAADF-STEM, Hysteresis, Shape Memory, Slice-and-View

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