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Title: An informatics approach to transformation temperatures of NiTi-based shape memory alloys

Authors:
; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1397788
Grant/Contract Number:
20140013DR
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 125; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 22:18:47; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Xue, Dezhen, Xue, Deqing, Yuan, Ruihao, Zhou, Yumei, Balachandran, Prasanna V., Ding, Xiangdong, Sun, Jun, and Lookman, Turab. An informatics approach to transformation temperatures of NiTi-based shape memory alloys. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2016.12.009.
Xue, Dezhen, Xue, Deqing, Yuan, Ruihao, Zhou, Yumei, Balachandran, Prasanna V., Ding, Xiangdong, Sun, Jun, & Lookman, Turab. An informatics approach to transformation temperatures of NiTi-based shape memory alloys. United States. doi:10.1016/j.actamat.2016.12.009.
Xue, Dezhen, Xue, Deqing, Yuan, Ruihao, Zhou, Yumei, Balachandran, Prasanna V., Ding, Xiangdong, Sun, Jun, and Lookman, Turab. Wed . "An informatics approach to transformation temperatures of NiTi-based shape memory alloys". United States. doi:10.1016/j.actamat.2016.12.009.
@article{osti_1397788,
title = {An informatics approach to transformation temperatures of NiTi-based shape memory alloys},
author = {Xue, Dezhen and Xue, Deqing and Yuan, Ruihao and Zhou, Yumei and Balachandran, Prasanna V. and Ding, Xiangdong and Sun, Jun and Lookman, Turab},
abstractNote = {},
doi = {10.1016/j.actamat.2016.12.009},
journal = {Acta Materialia},
number = C,
volume = 125,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.actamat.2016.12.009

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • Many unusual thermomechanical properties of shape-memory alloys are directly connected with martensitic type phase transitions in these systems. Because the martensitic transformations, as a rule, are the first order transitions, a special attention should be given to a hysteretic behavior of shape-memory alloys. The most important characteristics of the temperature- or stress-induced martensitic transformation, have been previously studied in detail. It has been shown that such macroscopic state variables as inelastic strain or volume fraction of the martensite are always complex multi-valued functions of the temperature and external stress. Therefore, the shape-memory alloys should be considered as systems having anmore » infinite number of state equations, representing inelastic strain and volume fraction of martensite as functions of the external stress and temperature, correspondingly. Some of the phenomenological approaches for the thermomechanical state equations for shape memory alloys were recently published. In particular, a special type of differential equation describing evolution of the inelastic macroscopic strain and volume fraction of martensite as a function of the temperature has been proposed. Its application to partial temperature cycling processes in shape-memory alloys and some other problems associated with the irreversible processes caused by hysteresis are discussed in the present paper.« less
  • A new, quantitative model was developed to describe the martensite transformation kinetics of thermoelastic shape memory alloys (SMAs). In addition, a series of experiments were conducted to study the kinetics of thermoelastic martensite transformation in four SMA systems: NiTi, NiTi-15at%Hf, NiTi-20at%Zr and NiMn-7.5at%Ti alloys. Comparisons between data of the kinetic of martensite transformation with the present theoretic models show that the proposed model is in good agreement and concurs with the experimental data. Also, a comparison of data from the proposed model with data from existing kinetic models, such as Liang`s and Magee`s indicates that the proposed model can bettermore » describe the experimental data, including the relationship between d{xi}(T)/dT and {xi}, and d{xi}(T)/dT and T.« less
  • It is now well-known that the two-way memory effect (TWME) of shape memory alloys is obtained after a thermomechanical cycling called training. Although this point is well-admitted, many controversies still subsist on the physical origin of this two-memory effect. The explanations of the development of the TWME which are often given are either the presence after training of a low proportion of local stabilized martensite in the parent phase or the presence after training of an internal stress field in the material. Recently, in a systematic study of the two-way memory effect obtained by thermomechanical training cycles under homogeneous tensilemore » constant load, Stalmans et. al. disproved these two previous explanations. Following the study, the most important effect of the dislocation arrays which are introduced during the training is not to develop internal stresses but rather to give rise to a microstructural anisotropy inducing a thermodynamic anisotropy. It means that after training, the crystallographically equivalent martensite variants are no more thermodynamically equivalent. The present paper describes some experimental results obtained by the homogeneous simple shear training of a NiTi shape memory alloy. The experiments have been specifically designed to give new comprehension elements on the existence and the nature of the thermodynamic anisotropy developed during training.« less
  • A Cu-20.6 wt.% Zn-5.7 wt.% Al alloy containing a small quantity of Zr was chose for the study of grain-size effect on transformation temperatures in copper-based, shape-memory alloys. Various thermal treatments were performed to obtain a range of grain sizes. The transformation temperatures were determined using electrical resistance measurement and shape-change effects. All the transformation temperatures shifted to lower temperatures as grain size decreased, except for the temperature at which no further shape change occurred on cooling. For the grain-size range of 35 ..mu..m to a maximum of 50 ..mu..m, this corresponded to a shift of as much as 15/supmore » 0/C in transformation temperatures. The effect of grain size on transformation temperatures has been found to follow the Hall-Petch relationship.« less
  • Macroscopic tensile and in-situ neutron diffraction measurements are reported from a 20.5 volume percent, 50.7 at% Ni-Ti fiber reinforced 6082-T6 aluminum matrix composite subjected to a room temperature, 4% tensile elongation. The austenite B2(110) diffraction intensity was essentially stable until approximately 0.9% strain, beyond which, the austenite B2(110) diffraction intensity strongly decreased with increasing tensile strain. The martensite M(001) diffraction intensity strongly increased from a zero intensity intercept at approximately 2.3% strain to the conclusion of tensile straining. This report concludes that the initial decrease in austenite B2(11) diffraction intensity locates the initiation of stress induced transformations in the NiTimore » reinforcement, furthermore this feature corresponds with an elevated yield point region in the macroscopic tensile results. Therefore, it appears that the elevated yield point region is caused by a temporary inhibition of fiber stress induced transformations.« less