Title: Asymmetry of stress-strain curves under tension and compression for NiTi shape memory alloys
Authors: Liu, Yong ×
Xie, Z.
Van Humbeeck, Jan
Delaey, Lucas #
Issue Date: Jul-1998
Publisher: Pergamon-elsevier science ltd
Series Title: Acta Materialia vol:46 issue:12 pages:4325-4338
Abstract: The stress-strain curves of polycrystalline martensitic NiTi shape memory alloys are often different for loading under tension and compression. Under tension, a flat stress-plateau occurs, while under compression, the material is quickly strain hardened and no flat stress-plateau is observed. Cyclic deformation under tension-compression also shows that it is more difficult to deform the material during compression than during tension, where an asymmetric stress-strain loop is obtained. TEM observations show that, under tension to 4% strain, martensite variants are partially reoriented via migration of variant interfaces with formation of dislocation networks mainly along the junction plane areas, and no significantly plastic deformation has been observed inside the martensite twin bands. While under compression to 4% strain, a high density of dislocations has been generated in both the martensite twin bands and the variant accommodation area, and no significant martensite reorientation via variant interfacial migration has been observed. This shows that the deformation mechanism of martensitic polycrystalline NiTi SMAs under tension is different from that under compression. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.
ISSN: 1359-6454
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

Files in This Item:
File Status SizeFormat
pub00503.pdf Published 528KbAdobe PDFView/Open Request a copy

These files are only available to some KU Leuven Association staff members


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science