Accessible Requires Authentication Published by De Gruyter December 5, 2014

A study on the pseudoelasticity of low temperature aged and thermomechanically treated Ti-51.5 at.% Ni shape memory alloy

Mehrdad Karimzadeh, Mohammad Reza Aboutalebi, Mohammad Taghi Salehi, Seyyed Mahdi Abbasi and Maryam Morakabati

Abstract

The aim of the present work is to investigate the effects of low temperature aging and thermomechanical treatments on the transformation and deformation behavior of an Ni-rich NiTi alloy. One sample of solution treated Ti-51.5 at.% Ni shape memory alloy was aged at 300°C for 1 hr. The other solution annealed sample, was firstly cold rolled to a reduction of 20% and then aged at 300°C for 1 hr. Applying these treatments, samples showed R-phase transformations in the absence of B19′ phase formation according to differential scanning calorimetry curves. By applying 20% cold reduction in area prior to aging, almost complete recovery of strain was observed and pseudoelasticity improved significantly compared to the conventional aged sample. Results of thermal analysis and tensile tests suggest that the observed pseudoelasticity for the thermomechanically treated sample can be due to stress-induced formation of R-phase. It is proposed that if stress-induced transformation of B19′ phase does not take place, stress-induced transformation of R-phase can extend to higher than 1% strain. Hence, pseudoelastic behavior due to this transformation can be observed.


* Correspondence address, Mehrdad Karimzadeh, Center of Excellence for High Strength Alloys Technology (CEHSAT), Iran University of Science and Technology (IUST), Narmak, Tehran, 1684613114, Iran, Tel.: +989128822146, Fax: +982177240480, E-mail: ,

References

[1] J.Van Humbeeck: Mater. Sci. Eng.A273–275 (1999) 134148. 10.1016/S0921-5093(99)00293-2 Search in Google Scholar

[2] T.Duerig, A.Pelton, D.Stöckel: Mater. Sci. Eng.A273–275 (1999) 149160. 10.1016/S0921-5093(99)00294-4 Search in Google Scholar

[3] M.Morakabati, M.Aboutalebi, S.Kheirandish, A. KarimiTaheri, S.M.Abbasi: Intermetallics19 (2011) 13991404. 10.1016/j.intermet.2011.05.005 Search in Google Scholar

[4] M.Morakabati, S.Kheirandish, M.Aboutalebi, A.K.Taheri, S.M.Abbasi: Mater. Sci. Eng.A528 (2011) 56565663. 10.1016/j.msea.2011.04.036 Search in Google Scholar

[5] M. NiliAhmadabadi, H.Shahmir, F.Naghdi: Mater. Des.32 (2011) 365370. 10.1016/j.matdes.2010.06.022 Search in Google Scholar

[6] K.Otsuka, X.Ren: Prog Mater Sci.50 (2005) 511678. 10.1016/j.pmatsci.2004.10.001 Search in Google Scholar

[7] K.Otsuka, X.Ren: Intermetallics7 (1999) 511528. 10.1016/S0966-9795(98)00070-3 Search in Google Scholar

[8] Y.Kudoh, M.Tokonami, S.Miyazaki, K.Otsuka: Acta Metall.33 (1985) 20492056. 10.1016/0001-6160(85)90128-2 Search in Google Scholar

[9] E.Goo, R.Sinclair: Acta Metall.33 (1985) 17171723. 10.1016/0001-6160(85)90166-X Search in Google Scholar

[10] J.Olbricht, A.Yawny, J.L.Pelegrina, A.Dlouhy, G.Eggeler: Metall. Mater. Trans.A42 (2011) 25562574. 10.1007/s11661-011-0679-y Search in Google Scholar

[11] S.Gollerthan, M.L.Young, K.Neuking, U.Ramamurty, G.Eggeler: Acta Mater.57 (2009) 58925897. 10.1016/j.actamat.2008.10.055 Search in Google Scholar

[12] L.C.Brinson, I.Schmidt, R.Lammering: J. Mech. Phys. Solids52 (2004) 15491571. 10.1016/j.jmps.2004.01.001 Search in Google Scholar

[13] X.Huang, Y.Liu: Scr. Mat.45 (2001) 153160. 10.1016/S1359-6462(01)01005-3 Search in Google Scholar

[14] S.Miyazaki, K.Otsuka: Philos. Mag.A50 (1985) 393408. 10.1080/01418618408244235 Search in Google Scholar

[15] S.Miyazaki, K.Otsuka: Metall. Trans.A17 (1986) 5363. 10.1007/BF02644442 Search in Google Scholar

[16] J.Olbricht, A.Yawny, J.L.Pelegrina, G.Eggeler, V.A.Yardley: J. Alloys Compd.579 (2013) 249252. 10.1016/j.jallcom.2013.06.056 Search in Google Scholar

[17] S.Miyazaki, C.M.Wayman: Acta Metall.36 (1988) 181192. 10.1016/0001-6160(88)90037-5 Search in Google Scholar

[18] K.L.Ng, Q.P.Sun: Mech. Mater.38 (2006) 4156. 10.1016/j.mechmat.2005.05.008 Search in Google Scholar

[19] G.B.Stachowiak, P.G.McCormick: Acta Metall.36 (1988) 291297. 10.1016/0001-6160(88)90006-5 Search in Google Scholar

[20] G.Fan, W.Chen, S.Yang, J.Zhu, X.Ren, K.Otsuka: Acta Mater.52 (2004) 43514362. 10.1016/j.actamat.2003.10.003 Search in Google Scholar

[21] J.Frenzel, E.P.George, A.Dlouhy, C.Somsen, M.F.X.Wagner, G.Eggeler: Acta Mater.58 (2010) 34443458. 10.1016/j.actamat.2010.02.019 Search in Google Scholar

[22] C.W.Chan, S.H.J.Chan, H.C.Man, P.Ji: Int. J. Plast.32–33 (2012) 85105. 10.1016/j.ijplas.2011.12.003 Search in Google Scholar

Received: 2014-04-18
Accepted: 2014-07-25
Published Online: 2014-12-05
Published in Print: 2014-12-08

© 2014, Carl Hanser Verlag, München