Journal
SCRIPTA MATERIALIA
Volume 59, Issue 5, Pages 566-569Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2008.05.004
Keywords
high-pressure torsion; in situ transmission electron microscopy (TEM); nanocrystallization; kinetics; NiTi shape memory alloy
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Almost complete amorphization is obtained in NiTi subjected to high-pressure torsion (HPT). Nanocrystallization occurs more than 100 degrees C lower than in amorphous sputtered and melt spun NiTi. This is caused by medium-range-ordered debris surviving HPT and triggering nanocrystallization. A high nucleation rate and low growth rate result from in situ heating transmission electron microscopy experiments. The kinetics of the heterogeneous nanocrystallization differs significantly from that leading to coarse grains. Therefore, HPT allows the nanostructure to be tailored to enhance shape memory properties. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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