期刊
SCRIPTA MATERIALIA
卷 60, 期 12, 页码 1137-1140出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2009.02.055
关键词
Amorphization; High-pressure torsion (HPT); Transmission electron microscopy (TEM); NiTi; Shape memory alloys (SMA)
类别
资金
- University of Vienna
NiTi shape memory alloys deformed by high-pressure torsion (HPT) were investigated by transmission electron microscopy. Radial sections of the HPT discs facilitate the analysis of nanoscale amorphous and crystalline phases. Ultrathin amorphous ribbons forming at grain boundaries are intersected by shear bands. At higher deformation they transform into thicker amorphous bands containing nanocrystalline debris. In the case of planar sections, the presence of amorphous phase can be obscured by overlapping nanocrystals leading to moire contrast. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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