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Diffuse Yield drop and Snap Action in a Ni-Ti Alloy

Published online by Cambridge University Press:  25 February 2011

T.W. Duerig  and
K.N. Melton
T.W. Duerig
Affiliation:
Nitinol Development Corporation, 46716 Fremont Blvd., Fremont, CA 94538
K.N. Melton
Affiliation:
Raychem Corporation, 300 Constitution Drive, Menlo Park, CA 94025
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Abstract

An unusual yield phenomenon is observed in a heavily worked NiTiFe alloy, which leads to snap action shape memory and superelasticity. The snap action occurs at extremely high velocities and is accompanied by a loud cracking sound. The cause of the instability is attributed to penning, in which martensite growth is halted by having to undergo a reorientation at low angle cell boundaries, which then lowers the resolved shear stress on the martensite plate. Once free of the cell boundary, the plate grows and its strain energy is reduced so that it is able to penetrate subsequent boundaries more easily. This results in a diffuse yield drop, and the said snap action motion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 159
Copyright
Copyright © Materials Research Society 1992

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References

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