Determining transformation temperatures of equiatomic TiNi shape memory alloy by dynamic mechanical analysis test
Journal
Journal of Alloys and Compounds
Journal Volume
577
Journal Issue
SUPPL. 1
Date Issued
2013
Author(s)
Abstract
Strain variation induced by martensitic transformation of Ti 50Ni50 shape memory alloy (SMA) is investigated by dynamic mechanical analysis (DMA) test. The extent of the positive and negative strain variation is mainly associated with the softening and hardening rate of storage modulus E0, respectively. The occurrence of the strain variation is related to DMA instrument design since the stress accommodation cannot keep up with the drastic change of the E0 softening/hardening rate during transformation. Strain variation is very sensitive and can rapidly respond to the E0 change, thus martensitic transformation temperatures of SMAs associated with a multi-stage transformation can be determined precisely from the onset/finish of the strain variation. © 2012 Elsevier B.V.
Type
journal article