The effect of thermal cycling on B2→B19→B19′ Ti 50Ni 40Cu 10 shape memory alloy by dynamic mechanical analyzer
Journal
Materials Transactions
Journal Volume
49
Journal Issue
12
Pages
2776-2780
Date Issued
2008
Author(s)
Abstract
The effect of thermal cycling on B2→B19→B19′ transformations of cold-rolled and annealed Ti 50Ni 40Cu 10 SMA was examined by DMA. Experimental results point out the transformation peak temperature and its tan δ peak value of B19→B19′ transformation are more suppressed by thermal cycling than those of B2→B19. This is because of the different microstructures between B19 and B19′ martensites in which B19 is a defect-free martensite but B19′ has plenty of twinning. Dislocations induced by thermal cycling can hinder the mobility of twin boundaries of B19′ martensite and cause different thermal cycling effects on B2→B19 and B19→B19′ transformations. Thermal cycling also shows an obvious effect on storage modulus E 0 values of B19 and B19′ martensites and their E 0 values increase with increasing thermal cycles. © 2008 The Japan Institute of Metals.
Type
journal article