PIRE - mathematics, mechanics, materials science

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Publication 56

Microstructural Dependence on Middle Eigenvalue in Ti-Ni-Au

Authors:

H. Shia
EMAT, University of Antwerp
Groenenborgerlaan 171, B-2020 Antwerp, Belgium


R. Delvillea
EMAT, University of Antwerp
Groenenborgerlaan 171, B-2020 Antwerp, Belgium
now at SCK-CEN, Boeretang 200, B-2400 Mol, Belgium


MinnesotaVijay Srivastava
Aerospace Engineering and Mechanics, University of Minnesota, Minnapolis, MN
Current address: GE Global Research Center, 1 Research Circle, Niskayuna, NY


MinnesotaRichard D. James
Aerospace Engineering and Mechanics
University of Minnesota, Minneapolis, MN 55455


D. Schryvers
EMAT, University of Antwerp
Groenenborgerlaan 171, B-2020 Antwerp, Belgium


Abstract:
The microstructure of various compounds of the Ti-Ni-Au alloy system is investigated by transmission electron microscopy in relation with changing lattice parameters improving the compatibility conditions between austenite and martensite expressed by the $\lambda_2=1$ equation based on the Geometrically Non Linear Theory of Martensite (GNLTM). Although local differences in microstructure are observed, when increasing the gold content compound twins are replaced by Type I twins, while twinned lamellar structures are replaced by untwinned plates and self-accommodating structures when $\lambda_2=1$ is approached, all confirming the predictions of the GNLTM.
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