Advanced TEM and SEM Methods Applied to 3D Nano- and Microstructural Investigations of Ni4Ti3 Precipitates in Ni-Ti (SMA)

Dominique Schryvers; Wim Tirry; Shan Shan Cao

doi:10.4028/www.scientific.net/SSP.172-174.229

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HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Advanced TEM and SEM Methods Applied to 3D Nano-...

Advanced TEM and SEM Methods Applied to 3D Nano- and Microstructural Investigations of Ni₄Ti₃ Precipitates in Ni-Ti (SMA)

Abstract:

Two different kinds of experimental approaches yielding three-dimensional structural information on metastable semi-coherent precipitates are demonstrated. By combining high-resolution images from two independent viewing directions a full description of the strain field surrounding a nano-sized Ni₄Ti₃ precipitate in Ni-Ti can be obtained. The principal axes and strains correlate well with the transformation strain of the observed R-phase transformation close to the precipitate. Using a slice-and-view procedure in a FIB/SEM dual-beam instrument, a three-dimensional voxel dataset is produced from which morphological and distributional information on the same precipitates can be obtained yielding new insight into the particular transformation paths of these alloys, relevant for their functional behaviour.

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Periodical:

Solid State Phenomena (Volumes 172-174)

Pages:

229-235

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.229

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Online since:

June 2011

Authors:

Dominique Schryvers, Wim Tirry, Shan Shan Cao

Keywords:

3D Imaging, HRTEM, Ni-Ti, Precipitation, Slice and View, Strain Field

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