2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
Seven Nobel Laureates have already confirmed their attendance: Prof. Dan Shechtman, Prof. Sir Fraser Stoddart, Prof. Andre Geim, Prof. Thomas Steitz, Prof. Ada Yonath, Prof. Kurt Wüthrich and Prof. Ferid Murad. More than 400 Abstracts Submitted from about 60 Countries.
Abstract Submission
Login

DETAILLED PROGRAM OVERVIEW

Back
    The Influence of Aging Treatments on a Ti-Ni 50.7 at. % Mechanical Spring
    Hugo De Souza Oliveira1; Henrique Alves Bandeira2; Aline Souza De Paula1;
    1UNIVERSITY OF BRASILIA, Brasilia, Brazil; 2UNIVERSITY OF BRASILIA, Brasília, Brazil;
    PAPER: 363/Manufacturing/Regular (Oral)
    SCHEDULED: 14:50/Wed./Mar Azul (50/1st)



    ABSTRACT:
    Near equiatomic Ti-Ni shape memory alloys have been attracting much interest for practical applications in many research fields, such as medical, orthodontic, mechanical, and aerospace industries [1], [2]. <br />The remarkable ability in recovering large strains as well as generating high stresses has caused an increase in manufacturing devices made up of these materials[1], [3]-[5].<br />Many studies assert that shape memory characteristics of binary Ti-Ni alloys can be improved through specific thermomechanical treatments, such as annealing following cold working [6]-[8], thermal and/or stress cycling [9], and aging after solution treatment [6], [8], [10]. For Ni rich Ti-Ni alloys, aging treatment is the most effective method for improving the shape memory and mechanical characteristics of the alloys [6], [8], [10].<br />In literature, many studies correlate the effects of aging treatments on the transformation behavior of the Ti-Ni alloys [5], [6], [11]-[15], however few focus on how it can influence the stress-strain hysteresis in mechanical elements [3], such as mechanical springs. This study presents how aging treatments ranging from low to high temperatures (573K to 773K) [16] for different times can affect the cyclic hysteretic behavior of a Ti-Ni 50.7 at. % shape memory spring. The findings enable the choice of appropriate heat treatments where specific energy dissipation rates are required.

    References:
    [1] D. C. Lagoudas, Shape Memory Alloys: Modeling and Engineering Applications. Springer, 2008.<br />[2] J. Mohd Jani, M. Leary, A. Subic, and M. A. Gibson, A review of shape memory alloy research, applications and opportunities, Mater. Des. 1980-2015, vol. 56, pp. 1078-1113, Apr. 2014.<br />[3] S. Jiang, Y. Zhao, Y. Zahng, L. Hu, and Y. Liang, Effect of solution treatment and aging on microstructural evolution and mechanical behavior of NiTi shape memory alloy, Trans. Nonferrous Met. Soc. China, vol. 23, no. 12, pp. 3658-3667, 2013.<br />[4] Y. Zheng, F. Jiang, L. Li, H. Yang, and Y. Liu, Effect of ageing treatment on the transformation behaviour of Ti 50.9at.% Ni alloy, Acta Mater., vol. 56, no. 4, pp. 736-745, 2008.<br />[5] Q. C. Fan et al., Influences of transformation behavior and precipitates on the deformation behavior of Ni-rich NiTi alloys, Mater. Sci. Eng. A, vol. 700, pp. 269-280, Jul. 2017.<br />[6] S. Miyazaki, Y. Ohmi, K. Otsuka, and Y. Suzuki, Characteristics of Deformation And Transformation Pseudoelasticity In Ti-Ni Alloys, J. Phys. Colloq., vol. 43, no. C4, pp. C4-255-C4-260, Dec. 1982.<br />[7] H. C. Lin and S. K. Wu, The tensile behavior of a cold-rolled and reverse-transformed equiatomic TiNi alloy, Acta Metall. Mater., vol. 42, no. 5, pp. 1623-1630, May 1994.<br />[8] J. I. Kim and S. Miyazaki, Effect of nano-scaled precipitates on shape memory behavior of Ti-50.9at.%Ni alloy, Acta Mater., vol. 53, no. 17, pp. 4545-4554, Oct. 2005.<br />[9] S. Miyazaki, Y. Igo, and K. Otsuka, Effect of thermal cycling on the transformation temperatures of TiNi alloys, Acta Metall., vol. 34, no. 10, pp. 2045-2051, Oct. 1986.<br />[10] S. Miyazaki, T. Imai, Y. Igo, and K. Otsuka, Effect of cyclic deformation on the pseudoelasticity characteristics of Ti-Ni alloys, Metall. Trans. A, vol. 17, no. 1, pp. 115-120, Jan. 1986.<br />[11] J. Khalil-Allafi, A. Dlouhy, and G. Eggeler, Ni4Ti3-precipitation during aging of NiTi shape memory alloys and its influence on martensitic phase transformations, Acta Mater., vol. 50, no. 17, pp. 4255-4274, 2002.<br />[12] J. Khalil-Allafi, G. Eggeler, A. Dlouhy, W. W. Schmahl, and C. Somsen, On the influence of heterogeneous precipitation on martensitic transformations in a Ni-rich NiTi shape memory alloy, Mater. Sci. Eng. A, vol. 378, no. 1-2, pp. 148-151, Jul. 2004.<br />[13] G. Fan, W. Chen, S. Yang, J. Zhu, X. Ren, and K. Otsuka, Origin of abnormal multi-stage martensitic transformation behavior in aged Ni-rich Ti-Ni shape memory alloys, Acta Mater., vol. 52, no. 14, pp. 4351-4362, 2004.<br />[14] B. K. Ravari, S. Farjami, and M. Nishida, Effects of Ni concentration and aging conditions on multistage martensitic transformation in aged Ni-rich Ti-Ni alloys, Acta Mater., vol. 69, pp. 17-29, May 2014.<br />[15] G. Fan, Y. Zhou, W. Chen, S. Yang, X. Ren, and K. Otsuka, Precipitation kinetics of Ti3Ni4 in polycrystalline Ni-rich TiNi alloys and its relation to abnormal multi-stage transformation behavior, Mater. Sci. Eng. A, vol. 438-440, no. SPEC. ISS., pp. 622-626, Nov. 2006.<br />[16] X. Wang, B. Verlinden, and S. Kustov, Multi-stage martensitic transformation in Ni-rich NiTi shape memory alloys, Funct. Mater. Lett., vol. 10, no. 01, p. 1740004, Dec. 2016.