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Nanoindentation and Microindentation of CuAlNi Shape Memory Alloy

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Abstract

Nanoindentation and microindentation studies were conducted within individual grains of a CuAlNi shape memory alloy. Linear surface features were observed near the indentations after unloading, many of which were responsive to heating. Crystallographic orientation information was obtained from electron backscattering diffraction in order to compare the orientation of observed surface features to predicted austenite–martensite interfaces, slip planes, and possible fracture planes in this alloy. Most of the features observed can be attributed to austenite–martensite interfaces, which remain in the material after unloading due to the constraints of the plastic deformation created by indentation. Due to the temperature dependence of the transformation stress in shape memory alloys, these stress-induced martensites are observed to diminish with heating and to reappear with cooling. Plastic deformation is observed in the form of pile-up near the indentation.

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Authors and Affiliations

  1. Department of Engineering Physics, University of Wisconsin—Madison, 1500 Engineering Drive, Madison, WI, 53706, USA

    W. C. Crone (SEM member)

  2. Materials Science Program, University of Wisconsin—Madison, 1509 University Ave., Madison, WI, 53706, USA

    H. Brock

  3. Engineering Mechanics Program, University of Wisconsin—Madison, 1500 Engineering Drive, Madison, WI, 53706, USA

    A. Creuziger (SEM member)

Authors
  1. W. C. Crone
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  2. H. Brock
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  3. A. Creuziger
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Correspondence to W. C. Crone.

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Crone, W.C., Brock, H. & Creuziger, A. Nanoindentation and Microindentation of CuAlNi Shape Memory Alloy. Exp Mech 47, 133–142 (2007). https://doi.org/10.1007/s11340-006-8884-0

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  • DOI: https://doi.org/10.1007/s11340-006-8884-0

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