TITLE

Breaching the work output limitation of ferromagnetic shape memory alloys

AUTHOR(S)
Ganor, Yaniv; Shilo, Doron; Shield, Thomas W.; James, Richard D.
PUB. DATE
September 2008
SOURCE
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p122509
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
One important parameter that quantifies the performance of ferromagnetic shape memory alloys is the blocking stress. To date, the low blocking levels (<5 MPa) impede the utilization of these alloys in applications where high work output is required. In this paper, we demonstrate an increase in the blocking stress by more than 100% by reducing the actuator size. A new theoretical model shows that smaller specimens have increased values of the blocking stress due to an enhancement in the energy barrier to magnetization rotation and indicates on a fundamental relationship among the specimen size, its microstructure, and its physical properties.
ACCESSION #
34647388

 

Related Articles

  • Twin boundary energy of hierarchically twinned magnetic shape memory alloys. Diestel, Anett; Backen, Anja; Rößler, Ulrich K.; Schultz, Ludwig; Fähler, Sebastian // Applied Physics Letters;8/29/2011, Vol. 99 Issue 9, p092512 

    Magnetic shape memory alloys exhibit a hierarchy of 'twins within twins' microstructures, covering all length scale from nanometer to millimeter. Modulated structures as nano-twinned adaptive martensite are the first generation of twinning. Using epitaxial Ni-Mn-Ga films as model system, we...

  • An effective interaction potential model for the shape memory alloy AuCd. Guthikonda, Venkata; Elliott, Ryan // Continuum Mechanics & Thermodynamics;Sep2009, Vol. 21 Issue 4, p269 

    The unusual properties of shape memory alloys (SMAs) result from a lattice level martensitic transformation (MT) corresponding to an instability of the SMAs crystal structure. Currently, there exists a shortage of material models that can capture the details of lattice level MTs occurring in...

  • Wide Range Temperature Memory Effect of an In Situ NiTi Alloys Composite. Li, Juntao; Zheng, Yanjun; Cui, Lishan // Journal of Materials Engineering & Performance;Oct2010, Vol. 19 Issue 7, p998 

    Incomplete martensitic transformation characteristics of NiTi shape memory alloys after cold deformation were studied. By designing the shape of the original surface curve, macroscopic domains with different dislocation density were introduced into the NiTi alloys and materials possessing the...

  • Evidence for preferential rearrangements of martensite variants by magnetic field in antiferromagnetic CoO crystal. Nie, Z. H.; Ren, Y.; Terai, T.; Wang, Y. D.; Brown, D. E.; Kakeshita, T. // Applied Physics Letters;8/3/2009, Vol. 95 Issue 5, p051914 

    The synchrotron high-energy x-ray diffraction provides the direct crystallographic evidence for the magnetic-field-driven preferential rearrangements of martensite multivariants in antiferromagnetic CoO crystal. When a magnetic field was incrementally applied up to 6 T on the CoO single crystal...

  • Stochastic bifurcation and fractal and chaos control of a giant magnetostrictive film-shape memory alloy composite cantilever plate subjected to in-plane harmonic and stochastic excitation. Zhiwen Zhu; Qingxin Zhang; Jia Xu // Journal of Applied Physics;2014, Vol. 115 Issue 17, p17E527-1 

    The article presents information on a study conducted on stochastic bifurcation, fractal and chaos of a magnetostrictive film-shape memory alloy composite cantilever plate. The cantilever plate is subjected to in-plane harmonic as well as stochastic excitation. The safe basin of the system was...

  • The Influence of Compressive Stress on the Order Parameter of 18R Martensites in CuAIBe Shape Memory Alloys. Balo, Ş. Nevin; Ceyland, Mehmet // Turkish Journal of Science & Technology;Jun2009, Vol. 4 Issue 1, p73 

    Phase transformations and order parameter in the shape memory alloys are sensitive to the stress applications and these stresses may cause important changes in crystallographic properties of alloys. In this study, five stage of compressive stress were applied onto two CuAlBe shape memory alloys...

  • Structural transformations in NiTi shape memory alloy nanowires. Mirzaeifar, Reza; Gall, Ken; Ting Zhu; Yavari, Arash; DesRoches, Reginald // Journal of Applied Physics;2014, Vol. 115 Issue 19, p194307-1 

    Martensitic phase transformation in bulk Nickle-Titanium (NiTi)-the most widely used shape memory alloy-has been extensively studied in the past. However, the structures and properties of nanostructured NiTi remain poorly understood. Here, we perform molecular dynamics simulations to study...

  • Origin of magnetic properties and martensitic transformation of Ni-Mn-In magnetic shape memory alloys. Tan, C. L.; Huang, Y. W.; Tian, X. H.; Jiang, J. X.; Cai, W. // Applied Physics Letters;3/26/2012, Vol. 100 Issue 13, p132402 

    The nature of unique magnetic properties and martensitic transformation of Ni2Mn1+xIn1-x shape memory alloy has been revealed by first-principles calculations. The uncommon magnetic properties occurring upon martensitic transformation are originated from the change of Mn-Mn interatomic...

  • Hysteresis and phase transitions for one-dimensional and three-dimensional models in shape memory alloys. Berti, V.; Fabrizio, M.; Grandi, D. // Journal of Mathematical Physics;Jun2010, Vol. 51 Issue 6, p062901 

    By means of the Ginzburg–Landau theory of phase transitions, we study a nonisothermal model to characterize the austenite-martensite transition in shape memory alloys. In the first part of this paper, the one-dimensional model proposed by Berti et al. [“Phase transitions in shape...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics