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Flow Stress and Elongation of Superplastic Deformation in La55Al25Ni20 Metallic Glass

Published online by Cambridge University Press:  10 February 2011

Y. Kawamura  and
A. Inoue
Y. Kawamura
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan, [email protected]
A. Inoue
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan, [email protected]
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Abstract

We have investigated the flow stress and elongation of superplastic deformation in a La55Al25Ni20 (at%) metallic glass that has a wide supercooled liquid region of 72 K before crystallization. The superplasticity that appeared in the supercooled liquid region was generated by the Newtonian viscous flow that exhibits the m value of unity. The elongation to failure was restricted by the transition of the Newtonian flow to non-Newtonian one and the crystallization during deformation. We succeeded in establishing the constitutive formulation of the flow stress in the supercooled liquid region. Its formulation was expressed very well by a stretched exponential function σflow=Dε exp(H*/RT) [1-exp(E/{ε exp(H**/RT)}0.82)]. Formulations describing the elongation to failure in constant-strain-rate and constant-crosshead velocity tests were, moreover, established. It was found from the simulation that the maximum elongation in the constant-strain-rate test reached more than 106% which was two orders of magnitude larger than that in the constant-crosshead-velocity test.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 303
Copyright
Copyright © Materials Research Society 2000

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