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  Deformation twinning in Ni–Mn–Ga micropillars with 10M martensite

Reinhold, M., Kiener, D., Knowlton, W. B., Dehm, G., & Müllner, P. (2009). Deformation twinning in Ni–Mn–Ga micropillars with 10M martensite. Journal of Applied Physics, 106(5): 053906. doi:10.1063/1.3211327.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-5221-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-5222-A
Genre: Journal Article

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 Creators:
Reinhold, Matthew1, Author              
Kiener, Daniel2, Author              
Knowlton, William B.1, 3, Author              
Dehm, Gerhard2, 4, Author              
Müllner, Peter5, Author              
Affiliations:
1Department of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA, ou_persistent22              
2Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Austria, ou_persistent22              
3Department of Electrical and Computer Engineering, Boise State University, Boise, ID 83725, USA, ou_persistent22              
4Department of Materials Physics, Montanuniversität Leoben, Austria, ou_persistent22              
5Former Dept. Micro/Nanomechanics of Thin Films and Biological Systems, Max Planck Institute for Intelligent Systems, Max Planck Society, ou_1497655              

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 Abstract: The maximum actuation frequency of magnetic shape-memory alloys (MSMAs) significantly increases with decreasing size of the transducer making MSMAs interesting candidates for small scale actuator applications. To study the mechanical properties of Ni–Mn–Ga single crystals on small length scales, two single-domain micropillars with dimensions of 10x15x30 µm3 were fabricated from a Ni–Mn–Ga monocrystal using dual beam focused ion beam machining. The pillars were oriented such that the crystallographic c direction was perpendicular to the loading direction. The pillars were compressed to maximum stresses of 350 and 50 MPa, respectively. Atomic force microscopy and magnetic force microscopy were performed prior to fabrication of the pillars and following the deformation experiments. Both micropillars were deformed by twinning as evidenced by the stress-strain curve. For one pillar, a permanent deformation of 3.6% was observed and ac twins (10M martensite) were identified after unloading. For the other pillar, only 0.7% remained upon unloading. No twins were found in this pillar after unloading. The recovery of deformation is discussed in the light of pseudoelastic twinning and twin-substrate interaction. The twinning stress was higher than in similar macroscopic material. However, further studies are needed to substantiate a size effect.

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Language(s): eng - English
 Dates: 2009
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1063/1.3211327
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Title: Journal of Applied Physics
  Abbreviation : J. Appl. Phys.
Source Genre: Journal
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Publ. Info: New York, NY : AIP Publishing
Pages: - Volume / Issue: 106 (5) Sequence Number: 053906 Start / End Page: - Identifier: ISSN: 0021-8979
CoNE: https://pure.mpg.de/cone/journals/resource/991042723401880