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Title: Multiscale twin hierarchy in NiMnGa shape memory alloys with Fe and Cu

Abstract

X-ray microdiffraction and scanning electron microscopy studies reveal 10 M martensitic structure with a highly correlated multiscale twin hierarchy organization in NiMnGaFeCu shape memory alloys. In this paper, high compatibility is found at the twin interfaces resulting in a highly correlated twinned lattice orientation across several laminate levels. The lattice unit cell is described as monoclinic I-centered with a = 4.28 Å, b = 4.27 Å, c = 5.40 Å, γ = 78.5°. The modulation is found parallel to the b axis. Finally, thin tapered needle-like lamellae and branching are observed near the twin boundaries.

Authors:
 [1];  [2];  [3];  [3];  [3];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.
  4. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
Carnegie Inst. of Washington, Argonne, IL (United States)
OSTI Identifier:
1286685
Alternate Identifier(s):
OSTI ID: 1250957
Grant/Contract Number:  
NA0001974; FG02-99ER45775; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 87; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Shape memory alloys; X-ray microdiffraction; Twin boundaries; Scanning electron microscopy; Multiscale structure

Citation Formats

Barabash, Rozaliya I., Barabash, Oleg M., Popov, Dmitry, Shen, Guoyin, Park, Changyong, and Yang, Wenge. Multiscale twin hierarchy in NiMnGa shape memory alloys with Fe and Cu. United States: N. p., 2015. Web. doi:10.1016/j.actamat.2015.01.010.
Barabash, Rozaliya I., Barabash, Oleg M., Popov, Dmitry, Shen, Guoyin, Park, Changyong, & Yang, Wenge. Multiscale twin hierarchy in NiMnGa shape memory alloys with Fe and Cu. United States. doi:10.1016/j.actamat.2015.01.010.
Barabash, Rozaliya I., Barabash, Oleg M., Popov, Dmitry, Shen, Guoyin, Park, Changyong, and Yang, Wenge. Sat . "Multiscale twin hierarchy in NiMnGa shape memory alloys with Fe and Cu". United States. doi:10.1016/j.actamat.2015.01.010. https://www.osti.gov/servlets/purl/1286685.
@article{osti_1286685,
title = {Multiscale twin hierarchy in NiMnGa shape memory alloys with Fe and Cu},
author = {Barabash, Rozaliya I. and Barabash, Oleg M. and Popov, Dmitry and Shen, Guoyin and Park, Changyong and Yang, Wenge},
abstractNote = {X-ray microdiffraction and scanning electron microscopy studies reveal 10 M martensitic structure with a highly correlated multiscale twin hierarchy organization in NiMnGaFeCu shape memory alloys. In this paper, high compatibility is found at the twin interfaces resulting in a highly correlated twinned lattice orientation across several laminate levels. The lattice unit cell is described as monoclinic I-centered with a = 4.28 Å, b = 4.27 Å, c = 5.40 Å, γ = 78.5°. The modulation is found parallel to the b axis. Finally, thin tapered needle-like lamellae and branching are observed near the twin boundaries.},
doi = {10.1016/j.actamat.2015.01.010},
journal = {Acta Materialia},
number = ,
volume = 87,
place = {United States},
year = {2015},
month = {1}
}

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