TY - JOUR
T1 - Influence of the Twin Microstructure on the Mechanical Properties in Magnetic Shape Memory Alloys
AU - Reinholz, Benjamin
AU - Brinckmann, Steffen
AU - Hartmaier, Alexander
AU - Muntifering, Brittany
AU - Knowlton, William B.
AU - Müllner, Peter
N1 - Publisher Copyright:
© 2016 Acta Materialia Inc.Published by Elsevier Ltd. All rights reserved.
PY - 2016/4/15
Y1 - 2016/4/15
N2 - The microstructure evolution, i.e. Reorientation of martensite variants, is an important deformation mechanism in shape-memory alloys. This microstructure evolution occurs by the motion of twin boundaries and the nucleation and annihilation of twins in the hierarchical microstructure. An appropriate discrete disclination model for the description of the internal elastic fields and microstructure evolution is introduced for representative volume elements. The model is applied to an experimentally characterized microstructure, i.e. Conjugation boundary, and the predicted mechanical response is verified by comparison to experimental measurements. The influence of the twin microstructure on the homogenized stress-strain curve is studied. It is found that regular twinned microstructures have a low strain energy and a high resistance against deformation. These simulations also reason the origin of the microstructural stability of conjugation boundaries.
AB - The microstructure evolution, i.e. Reorientation of martensite variants, is an important deformation mechanism in shape-memory alloys. This microstructure evolution occurs by the motion of twin boundaries and the nucleation and annihilation of twins in the hierarchical microstructure. An appropriate discrete disclination model for the description of the internal elastic fields and microstructure evolution is introduced for representative volume elements. The model is applied to an experimentally characterized microstructure, i.e. Conjugation boundary, and the predicted mechanical response is verified by comparison to experimental measurements. The influence of the twin microstructure on the homogenized stress-strain curve is studied. It is found that regular twinned microstructures have a low strain energy and a high resistance against deformation. These simulations also reason the origin of the microstructural stability of conjugation boundaries.
KW - magnetic shape-memory alloys
KW - Ni2MnGa
KW - twin boundary motion
KW - discrete disclination dynamics
KW - microstructural modeling
UR - http://www.scopus.com/inward/record.url?scp=84959420137&partnerID=8YFLogxK
UR - https://scholarworks.boisestate.edu/mse_facpubs/260
U2 - 10.1016/j.actamat.2016.02.007
DO - 10.1016/j.actamat.2016.02.007
M3 - Article
SN - 1359-6454
VL - 108
SP - 197
EP - 206
JO - Acta Materialia
JF - Acta Materialia
ER -