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Applied Physics Letters / Volume 97 / Issue 17 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 97, 171902 (2010); http://dx.doi.org/10.1063/1.3505494 (3 pages)

Evidence for short-time limit of martensite deaging in shape-memory alloys: Experiment and atomistic simulation

Junkai Deng1,2, Xiangdong Ding1,3, Zhen Zhang1,2, Turab Lookman3, Tetsuro Suzuki2, Kazuhiro Otsuka2, Jun Sun1, Avadh Saxena3, and Xiaobing Ren2

1Multidisciplinary Materials Research Center, Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
2Ferroic physics Group, National Institute for Materials Science, Tsukuba 305-0047, Ibaraki, Japan
3Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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(Received 3 September 2010; accepted 4 October 2010; published online 25 October 2010)

It is well known that martensite aging effects in shape memory alloys can be simply removed when the aged martensite experiences a reverse transformation to the parent phase followed by cooling back to the martensite state. This “deaging” process has been known to be very fast but it remains a question as to whether there exists a short-time limit for such a fast deaging process. In this letter, we report that there indeed exists a short-time limit for the deaging. We have studied the aging and deaging of a Au-49.5Cd shape memory alloy, and found that complete removal of the previous aging, as manifested by the recovery of martensite transition start temperature (Ms), occurs only after aging in the parent phase for more than 500 s. Shorter time holding/aging in the parent phase results in a higher Ms as compared with the fully deaged case. Therefore, there is a fast relaxation process during the deaging or parent phase aging process. Atomistic simulations suggest that the origin of the observed time-dependent deaging arises from the change in short-range configurations of point defects, being the same as that of the martensite aging. As a result, it is possible to unify the microscopic mechanism of aging in both martensite and parent phase; both are due to a symmetry-conforming short-range ordering tendency of point defects.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

ageing, cadmium alloys, gold alloys, martensitic transformations, point defects, shape memory effects, short-range order

PACS

  • 81.30.Kf

    Martensitic transformations

  • 61.72.J-

    Point defects and defect clusters

  • 81.40.Cd

    Solid solution hardening, precipitation hardening, and dispersion hardening; aging

  • 64.70.K-

    Solid-solid transitions

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3505494

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    W. Cai, J. Zhang, Z. Y. Gao, and J. H. Sui, Appl. Phys. Lett. 92, 252502 (2008)APPLAB000092000025252502000001.

    X. Ren and K. Otsuka, Phys. Rev. Lett. 85, 1016 (2000).

    J. Deng, X. Ding, T. Lookman, T. Suzuki, K. Otsuka, J. Sun, A. Saxena, and X. Ren, Phys. Rev. B 81, 220101 (2010).

    M. Parrinello and A. Rahman, J. Appl. Phys. 52, 7182 (1981)JAPIAU000052000012007182000001.

    N. Metropolis, A. W. Rosenbluth, M. N. Rosenbluth, A. H. Teller, and E. Teller, J. Chem. Phys. 21, 1087 (1953)JCPSA6000021000006001087000001.

    X. Ding, T. Suzuki, X. Ren, J. Sun, and K. Otsuka, Phys. Rev. B 74, 104111 (2006).


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