Shape memory behavior of FeNiCoTi single and polycrystals |
| |
Authors: | Huseyin Sehitoglu X Y Zhang T Kotil D Canadinc Y Chumlyakov H J Maier |
| |
Affiliation: | (1) Present address: the Aeronautical and Astronautical Engineering Department, Istanbul Technical University, Istanbul, Turkey;(2) Research Assistant are with the Department of Mechanical and Industrial Engineering, University of Illinois, 61801 Urbana, IL;(3) the Siberian Physical-Technical Institute, 6340502 Tomsk, Russia;(4) Lehrstühl fur Werkstoffkunde, University of Paderborn, 33095 Paderborn, Germany |
| |
Abstract: | We present experimental and theoretical evidence of thermoelastic martensites in Fe29Ni18Co4Ti alloys. In this class of alloys,
the high strength in the austenite domains limits the slip deformation as verified with transmission electron microscopy.
The restriction of slip permits a higher degree of recoverability of the transformation. Using both single crystals with 123]
orientation and polycrystals, the appearance of martensite plates upon deformation, and their reversion back to austenite
upon heating (the shape memory effect), is revealed with in-situ optical microscopy. Theoretical results for the transformation strains and the detwinning of martensite are presented, which
demonstrate convincingly the potential of these classes of alloys. Electrical resistance measurements identified the stress
and temperature levels at the onset of forward and reverse transformations in isothermal deformation and thermal cycling experiments,
respectively. The return of the electrical resistance to its reference value, upon austenite to martensite followed by martensite
to austenite transformation, verified the recovery in the transformation strains measured in the experiments. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|