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Understanding indentation-induced two-way shape memory effect

Published online by Cambridge University Press:  31 January 2011

Yijun Zhang ,
Yang-Tse Cheng  and
David S. Grummon
Yijun Zhang*
Affiliation:
Materials and Processes Laboratory, General Motors Research and Development Center, Warren, Michigan 48090
Yang-Tse Cheng
Affiliation:
Materials and Processes Laboratory, General Motors Research and Development Center, Warren, Michigan 48090
David S. Grummon
Affiliation:
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824
*
a)Address all correspondence to this author. e-mail: zhangyij@msu.edu
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Abstract

Spherical indents in NiTi shape memory alloys can have reversible depth change: deeper depth in the martensitic phase at low temperature and shallower depth in the austenitic phase at high temperature. This is the indentation-induced two-way shape memory effect. After polishing the indents, two-way reversible surface protrusions can occur on the shape memory alloy surfaces upon heating and cooling. The height of the surface protrusion is about the same as the depth of the reversible indent. Further polishing reduces the height of the surface protrusion, which disappears completely when the polished depth is about the length of the contact radius. By comparing finite element analysis and experimental data, we show that the depth at which a protrusion disappears is close to the 10% strain boundary. This suggests that slip-plasticity is responsible for the observed indentation-induced two-way shape memory effect.

Keywords

AlloyHardnessPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 10 , October 2007 , pp. 2851 - 2855
Copyright
Copyright © Materials Research Society 2007

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References

REFERENCES

1Ni, W.Y., Cheng, Y.T.Grummon, D.S.: Microscopic superelastic behavior of a nickel-titanium alloy under complex loading conditions. Appl. Phys. Lett. 82, 2811 2003CrossRefGoogle Scholar
2Ni, W.Y., Cheng, Y.T.Grummon, D.S.: Recovery of microindents in a nickel-titanium shape-memory alloy: A “self-healing” effect. Appl. Phys. Lett. 80, 3310 2002Google Scholar
3Zhang, Y.J., Cheng, Y.T.Grummon, D.S.: Indentation stress dependence of the temperature range of microscopic superelastic behavior of nickel-titanium thin films. J. Appl. Phys. 98, 033505 2005Google Scholar
4Shaw, G.A., Stone, D.S., Johnson, A.D., Ellis, A.B.Crone, W.C.: Shape memory effect in nanoindentation of nickel-titanium thin films. Appl. Phys. Lett. 83, 257 2003Google Scholar
5Ni, W.Y., Cheng, Y.T.Grummon, D.S.: Microscopic shape memory and superelastic effects under complex loading conditions. Surf. Coat. Technol. 177, 512 2004CrossRefGoogle Scholar
6Otsuka, K.Wayman, C.M.: Shape Memory Materials Cambridge University Press New York 1998Google Scholar
7Zhang, Y.J., Cheng, Y.T.Grummon, D.S.: Two-way indent depth recovery in a NiTi shape memory alloy. Appl. Phys. Lett. 88, 131904 2006Google Scholar
8Zhang, Y.J., Cheng, Y.T.Grummon, D.S.: Shape memory surfaces. Appl. Phys. Lett. 89, 041912 2006Google Scholar
9Nagasawa, A., Enami, K., Ishino, Y., Abe, Y.Nenno, S.: Reversible shape memory effect. Scripta Metall. 8, 1055 1974Google Scholar
10Scherngell, H.Kneissl, A.C.: Generation, development and degradation of the intrinsic two-way shape memory effect in different alloy systems. Acta Mater. 50, 327 2002Google Scholar
11Stalmans, R., Van Humbeeck, J.Delaey, L.: Thermomechanical cycling, 2 way memory and concomitant effects in Cu-Zn-Al alloys. Acta Metall. Mater. 40, 501 1992Google Scholar
12Liu, Y., Liu, Y.Van Humbeeck, J.: Two-way shape memory effect developed by martensite deformation in NiTi. Acta Mater. 47, 199 1998Google Scholar
13Wang, J.J., Omori, T., Sutou, Y., Kainuma, R.Ishida, K.: Two-way shape memory effect induced by cold-rolling in Ti-Ni and Ti-Ni-Fe alloys. Scripta Mater. 52, 311 2005Google Scholar
14Liu, Y., Xie, Z., Van Humbeeck, J.Delaey, L.: Some results on the detwinning process in NiTi shape memory alloys. Scripta Mater. 41, 1273 1999Google Scholar
15Ni, W.Y.Cheng, Y.T.: Modeling conical indentation in homogeneous materials and in hard films on soft substrates. J. Mater. Res. 20, 521 2005Google Scholar
16Johnson, K.L.: Contact Mechanics Cambridge University Press New York 1985 174–176Google Scholar
17Samuels, L.E.Mulhearn, T.O.: An experimental investigation of the deformed zone associated with indentation hardness impressions. J. Mech. Phys. Solids 5, 125 1957Google Scholar