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In-Situ Observation of Deformation Associated with R-Phase in NiTi Shape Memory Alloy

Published online by Cambridge University Press:  15 February 2011

Y. Gao ,
Y. Q. Liu  and
K. H. Wu
Y. Gao
Affiliation:
Department of Mechanical Engineering, Florida International University, Miami, FL 33199
Y. Q. Liu
Affiliation:
Department of Mechanical Engineering, Florida International University, Miami, FL 33199
K. H. Wu
Affiliation:
Department of Mechanical Engineering, Florida International University, Miami, FL 33199
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Abstract

An in-situ straining experiment was performed in a transmission electron microscope (TEM) on the polycrystalline Ti49Ni51 alloy with full R-phase at room temperature. The reorientation of Rphase variants to a single, favorable one was observed under small stress at the beginning of straining, corresponding to the deformation mode of the first yielding stage. During further straining, the observation showed that the reoriented R-phase undergoes a stress-induced martensite transformation, and this dynamic process was considered to contribute to the second stage deformation in the R-phase stress-strain curve. The orientation relationship between the R-phase and stress-induced martensite has been determined and the internal (001)M twins were found in the stressinduced martensite plates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 404: Symposium J – In Situ Electron and Tunneling Microscopy of Dynamic Processes , 1995 , 171
Copyright
Copyright © Materials Research Society 1996

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