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Modeling magnetoelasticity and magnetoplasticity with disconnections and disclinations

Published online by Cambridge University Press:  01 February 2011

Peter Mullner ,
Alan Steward Geleynse ,
David Robert Carpenter ,
Michael Scott Hagler  and
Markus Chmielus
Peter Mullner
Affiliation:
[email protected], Boise State University, Materials Science and Engineering, 1910 University Dr., MS 2075, Boise, ID, 83725, United States, 208-426 5136
Alan Steward Geleynse
Affiliation:
[email protected], Boise State University, Materials Science and Engineering, 1910 University Dr., MS 2075, Boise, ID, 83725, United States
David Robert Carpenter
Affiliation:
[email protected], Boise State University, Materials Science and Engineering, 1910 University Dr., MS 2075, Boise, ID, 83725, United States
Michael Scott Hagler
Affiliation:
[email protected], Boise State University, Materials Science and Engineering, 1910 University Dr., MS 2075, Boise, ID, 83725, United States
Markus Chmielus
Affiliation:
[email protected], Boise State University, Materials Science and Engineering, 1910 University Dr., MS 2075, Boise, ID, 83725, United States
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Abstract

The magneto-mechanical properties of magnetic shape-memory alloy single crystals depend strongly on the twin microstructure which is established during the martensitic transformation, and through thermo-magneto-mechanical training. For self-accommodated martensite, twin thickness and magnetic-field-induced strain are very small. For effectively trained crystals, a single twin may comprise the entire sample and magnetic-field-induced strain reaches the theoretical limit. Furthermore, the deformation of self-accommodated martensite is pseudo-elastic (magnetoelasticity) while the deformation of effectively trained crystals is plastic (magnetoplasticity). Twin microstructures of self-accommodated martensite were modeled using disclinations which are line defects such as dislocations, however with a rotational displacement field. The defect structure was approximated in a quadrupole solution where two quadrupoles represent an elementary twin double layer unit. The twin boundary was inclined to the twinning plane which required the introduction of twinning disconnections. The shear stress-shear strain properties of self-accommodated martensite were analyzed numerically for different initial configurations of the twin boundary (i.e. for different initial positions of the disconnections). The shear stress-shear strain curve is sensitive to the initial configuration indicating that disconnection nucleation is controlling the magneto-mechanical properties of self-accommodated martensite.

Keywords

microstructurecrystallinememory
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1050: Symposium BB – Magnetic Shape Memory Alloys , 2007 , 1050-BB02-01
Copyright
Copyright © Materials Research Society 2008

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