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Title: Effect of annealing on cold-rolled Ni-Ti alloys
Authors: Srivastava, A.K. ×
Yang, Z.
Schryvers, D.
Van Humbeeck, Jan #
Issue Date: May-2008
Publisher: Elsevier Sequoia
Series Title: Materials Science and Engineering A, Structural Materials: Properties, Microstructure and Processing vol:481-482 pages:594-597
Abstract: In this paper, we present a study on the effect of annealing a cold-rolled near-equi-atomic Ni–Ti alloy strip by transmission electron microscopy. Transmission electron microscopy of the as-received sample shows the presence of alternating amorphous and crystalline bands. The crystalline bands have widths of the order of a few microns and contain B2 nanograins of around 20 nm diameter, which are preferentially oriented along the [1,−1,−1] direction, normal to the rolling direction. As-received samples were annealed for 30 min at different temperatures up to 800 °C. With the increase in annealing temperature, crystallization starts in the amorphous bands at around 350 °C and finally ends up with the coarsening of the grains in the entire sample. The annealing of the samples at 450 °C entirely transforms the amorphous bands to crystalline bands and as off 600 °C Ni3Ti2 precipitates are formed. At 800 °C the grain size increases to 30–50 µm. Diffraction patterns from such grains reveal the presence of diffuse intensity around reciprocal lattice positions 1/3<1 1 0>* indicating the formation of the R-phase.
ISSN: 0921-5093
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Materials Engineering - miscellaneous
Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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