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Origin of pseudoelastic behavior in TiMo-based alloys L. C. Zhang, T. Zhou, S. P. Alpay, and M. Aindowa

Summary: Origin of pseudoelastic behavior in Ti­Mo-based alloys
L. C. Zhang, T. Zhou, S. P. Alpay, and M. Aindowa
Department of Materials Science and Engineering, Institute of Materials Science,
University of Connecticut, Storrs, Connecticut 06269-3136
M. H. Wu
Memry Corporation, Bethel, Connecticut 06801
Received 29 July 2005; accepted 13 October 2005; published online 7 December 2005
High-resolution transmission electron microscopy and in situ x-ray diffraction analyses have been
used to elucidate the compositional sensitivity of the deformation behavior in two -Ti­Mo-based
alloys. The alloy with 8% Mo exhibited conventional elastic/plastic behavior in tension which
corresponds to the irreversible formation of stress-induced orthorhombic martensite. The alloy
with 10% Mo exhibited a pronounced pseudoelastic response with recovery of 80% of the
imposed tensile strain. This phenomenon is associated with the formation of another orthorhombic
martensitic phase, which has not been reported previously, and this nucleates from pre-existing
domains in the matrix. © 2005 American Institute of Physics. DOI: 10.1063/1.2142089
Martensitic phase transformations are diffusionless, first-
order, structural transitions in which the martensite phase is
related to the initial phase by an invariant plane strain.1­3
Most martensitic phases form irreversibly due to the pinning
of the interfaces by dislocations or other crystal defects.


Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut


Collections: Materials Science