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Title: Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width

Abstract

No abstract prepared.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Univ. of Maryland; Caesar Research Center; Ruhr-Univ. Bochum; Hirosaki Univ.; Univ. of Minnesota
Sponsoring Org.:
USDOE
OSTI Identifier:
898745
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Materials; Journal Volume: 5; Journal Issue: 4; Related Information: Apr. 2006
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SHAPE MEMORY EFFECT; ELASTICITY; THERMODYNAMIC PROPERTIES; ALLOYS; HYSTERESIS; advanced photon source

Citation Formats

Cui, Jun, Chu, Yong S., Famodu, Olugbenga O., Furuya, Yasubumi, Hattrick-Simpers, Jae., James, Richard D., Ludwig, Alfred, Thienhaus, Sigurd, Wuttig, Manfred, Zhang, Zhiyong, and Takeuchi, Ichiro. Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width. United States: N. p., 2006. Web. doi:10.1038/nmat1593.
Cui, Jun, Chu, Yong S., Famodu, Olugbenga O., Furuya, Yasubumi, Hattrick-Simpers, Jae., James, Richard D., Ludwig, Alfred, Thienhaus, Sigurd, Wuttig, Manfred, Zhang, Zhiyong, & Takeuchi, Ichiro. Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width. United States. doi:10.1038/nmat1593.
Cui, Jun, Chu, Yong S., Famodu, Olugbenga O., Furuya, Yasubumi, Hattrick-Simpers, Jae., James, Richard D., Ludwig, Alfred, Thienhaus, Sigurd, Wuttig, Manfred, Zhang, Zhiyong, and Takeuchi, Ichiro. Sun . "Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width". United States. doi:10.1038/nmat1593.
@article{osti_898745,
title = {Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width},
author = {Cui, Jun and Chu, Yong S. and Famodu, Olugbenga O. and Furuya, Yasubumi and Hattrick-Simpers, Jae. and James, Richard D. and Ludwig, Alfred and Thienhaus, Sigurd and Wuttig, Manfred and Zhang, Zhiyong and Takeuchi, Ichiro},
abstractNote = {No abstract prepared.},
doi = {10.1038/nmat1593},
journal = {Nature Materials},
number = 4,
volume = 5,
place = {United States},
year = {Sun Mar 05 00:00:00 EST 2006},
month = {Sun Mar 05 00:00:00 EST 2006}
}
  • 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
  • In this paper, the authors develop a consistent mathematical description of martensite fraction evolution during athermal thermoelastic phase transformation in a shape memory alloy (SMA) induced by a general thermomechanical loading. The global kinetic law is based on an experimentally defined stress-temperature phase diagram, transformation functions for a one-dimensional SMA body and a novel vector hysteresis model. The global kinetic law provides the phase fraction history given a loading path on the stress-temperature phase diagram and an initial value of martensite fraction. The phase transformation is considered to occur only within transformation strips on the phase diagram and only onmore » loading path segments oriented in the transformation direction. The developed procedure can be used to model a range of different SMA transformation behaviors depending on the choice of transformation functions and local kinetic law algorithms. The phase fraction evolution is examined for a number of characteristic examples, including cyclic loading resulting in oscillatory transformation paths, and internal loops of partial transformation with associated attractor loops. Differences between the various local kinetic law algorithms used in the overall framework are highlighted. The simulation results using a cosine transformation function are found to be in excellent agreement with experimental data.« less
  • The effect of Nb substitution for Ni in Ni{sub 45}Co{sub 5}Mn{sub 40}Sn{sub 10} magnetic shape memory alloys on their magnetic properties, martensitic transformation characteristics, transformation hysteresis, and magnetocaloric properties was studied using wavelength-dispersive X-ray spectroscopy, differential scanning calorimetry, and the temperature and field dependence of the magnetization. Ni{sub 45}Co{sub 5}Mn{sub 40}Sn{sub 10} alloy has a very low transformation hysteresis; however, the martensitic transformation temperatures are notably above room temperature, which is not desirable for magnetic refrigeration applications. In this study, small quantities of Nb substitution were shown to drastically shift the transformation temperatures to lower temperatures, at a rate ofmore » 68 K/at. % Nb, which is needed for household refrigeration. The austenite Curie temperature also decreased with increasing Nb content. However, a decrease in the latent heat of the martensitic transition was observed, which negatively affects the magnetic field-induced adiabatic temperature change capability. Still, the relatively large transformation entropy and the low transformation hysteresis make the Nb-doped Ni{sub 45}Co{sub 5}Mn{sub 40}Sn{sub 10} alloys potential candidates for solid state refrigeration near room temperature.« less
  • Cu-based shape memory alloys (SMAs) are particularly interesting, compared to Ni-Ti SMAs because of their low cost and relatively ease process. However, there are important problems to be solved, such as intergranular fracture due to large grain size, stabilization of martensite, etc. In the present work, the influences of additions only less than 1 mass% of several fourth elements, such as Mn, Fe, Co, Ni, and Y, to two kinds of Cu-Zn-Al SMAs, i.e., Cu-30Zn-4Al and Cu-25Zn-7Al on their structure, crystal structure and shape recovery have been examined in order to know what elements are the most effective for themore » thermal stability of the parent and martensite phases and the shape memory capacity.« less