Detail publikace
Proposition of R-phase transformation strip in the phase diagram of Ni-Ti shape memory alloy using electromechanical experiments
SHAYANFARD, P. KADKHODAEI, M. SAFAEE, S.
Anglický název
Proposition of R-phase transformation strip in the phase diagram of Ni-Ti shape memory alloy using electromechanical experiments
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
The shape memory mechanism associated with R-phase transformation was investigated using electromechanical tests on Ni-Ti shape memory alloy thin wires. To provide a more precise insight into the effects of R-phase on phase transformation of shape memory alloys, wires were prepared in three different initial states prior to conducting the experiments: pure martensite, mixture of R-phase and martensite, and pure R-phase. The electromechanical tests were done in two different loading states (under constant and variable stresses) using specially designed and manufactured apparatuses. Tests under different constant stresses were carried out for three cases of pure martensite, a mixture of martensite and rhombohedral, and pure rhombohedral phase, while those under variable stresses were done on pure martensite as well as mixed martensite and rhombohedral. For all the expressed cases, strain-time responses were investigated during electric heating-cooling cycles to interpret possible microstructural changes in the samples. According to the results, a phase diagram containing R-phase transition strip was proposed for Ni-Ti shape memory alloys.
Anglický abstrakt
The shape memory mechanism associated with R-phase transformation was investigated using electromechanical tests on Ni-Ti shape memory alloy thin wires. To provide a more precise insight into the effects of R-phase on phase transformation of shape memory alloys, wires were prepared in three different initial states prior to conducting the experiments: pure martensite, mixture of R-phase and martensite, and pure R-phase. The electromechanical tests were done in two different loading states (under constant and variable stresses) using specially designed and manufactured apparatuses. Tests under different constant stresses were carried out for three cases of pure martensite, a mixture of martensite and rhombohedral, and pure rhombohedral phase, while those under variable stresses were done on pure martensite as well as mixed martensite and rhombohedral. For all the expressed cases, strain-time responses were investigated during electric heating-cooling cycles to interpret possible microstructural changes in the samples. According to the results, a phase diagram containing R-phase transition strip was proposed for Ni-Ti shape memory alloys.
Klíčová slova anglicky
electromechanical; phase diagram; R-phase; shape memory alloy
Vydáno
21.03.2017
Nakladatel
SAGE PUBLICATIONS LTD
Místo
LONDON
ISSN
1045-389X
Ročník
28
Číslo
19
Strany od–do
2757–2768
Počet stran
12
BIBTEX
@article{BUT164601,
author="Pejman {Shayanfard},
title="Proposition of R-phase transformation strip in the phase diagram of Ni-Ti shape memory alloy using electromechanical experiments",
year="2017",
volume="28",
number="19",
month="March",
pages="2757--2768",
publisher="SAGE PUBLICATIONS LTD",
address="LONDON",
issn="1045-389X"
}