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Title: Experimental evidence of stress-field-induced selection of variants in Ni-Mn-Ga ferromagnetic shape-memory alloys

Abstract

The in situ time-of-flight neutron-diffraction measurements captured well the martensitic transformation behavior of the Ni-Mn-Ga ferromagnetic shape-memory alloys under uniaxial stress fields. We found that a small uniaxial stress applied during phase transformation dramatically disturbed the distribution of variants in the product phase. The observed changes in the distributions of variants may be explained by considering the role of the minimum distortion energy of the Bain transformation in the effective partition among the variants belonging to the same orientation of parent phase. It was also found that transformation kinetics under various stress fields follows the scale law. The present investigations provide the fundamental approach for scaling the evolution of microstructures in martensitic transitions, which is of general interest to the condensed matter community.

Authors:
 [1];  [2];  [3]; ; ;  [1]; ;  [4]
  1. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States)
  2. (Ministry of Education), Northeastern University, Shenyang 110004 (China)
  3. Los Alamos Neutron Scattering Center, Los Alamos National Laboratory, New Mexico 87545 (United States)
  4. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110004 (China)
Publication Date:
OSTI Identifier:
20957833
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 17; Other Information: DOI: 10.1103/PhysRevB.75.174404; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTAL STRUCTURE; FERROMAGNETIC MATERIALS; GALLIUM ALLOYS; MANGANESE ALLOYS; MICROSTRUCTURE; NEUTRON DIFFRACTION; NICKEL ALLOYS; PHASE TRANSFORMATIONS; SHAPE MEMORY EFFECT; STRESSES; TIME-OF-FLIGHT METHOD; TRANSFORMATIONS

Citation Formats

Wang, Y. D., Key Laboratory for Anisotropy and Texture of Materials, Brown, D. W., Choo, H., Liaw, P. K., Benson, M. L., Cong, D. Y., and Zuo, L. Experimental evidence of stress-field-induced selection of variants in Ni-Mn-Ga ferromagnetic shape-memory alloys. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.174404.
Wang, Y. D., Key Laboratory for Anisotropy and Texture of Materials, Brown, D. W., Choo, H., Liaw, P. K., Benson, M. L., Cong, D. Y., & Zuo, L. Experimental evidence of stress-field-induced selection of variants in Ni-Mn-Ga ferromagnetic shape-memory alloys. United States. doi:10.1103/PHYSREVB.75.174404.
Wang, Y. D., Key Laboratory for Anisotropy and Texture of Materials, Brown, D. W., Choo, H., Liaw, P. K., Benson, M. L., Cong, D. Y., and Zuo, L. Tue . "Experimental evidence of stress-field-induced selection of variants in Ni-Mn-Ga ferromagnetic shape-memory alloys". United States. doi:10.1103/PHYSREVB.75.174404.
@article{osti_20957833,
title = {Experimental evidence of stress-field-induced selection of variants in Ni-Mn-Ga ferromagnetic shape-memory alloys},
author = {Wang, Y. D. and Key Laboratory for Anisotropy and Texture of Materials and Brown, D. W. and Choo, H. and Liaw, P. K. and Benson, M. L. and Cong, D. Y. and Zuo, L.},
abstractNote = {The in situ time-of-flight neutron-diffraction measurements captured well the martensitic transformation behavior of the Ni-Mn-Ga ferromagnetic shape-memory alloys under uniaxial stress fields. We found that a small uniaxial stress applied during phase transformation dramatically disturbed the distribution of variants in the product phase. The observed changes in the distributions of variants may be explained by considering the role of the minimum distortion energy of the Bain transformation in the effective partition among the variants belonging to the same orientation of parent phase. It was also found that transformation kinetics under various stress fields follows the scale law. The present investigations provide the fundamental approach for scaling the evolution of microstructures in martensitic transitions, which is of general interest to the condensed matter community.},
doi = {10.1103/PHYSREVB.75.174404},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 17,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}