Effect of strain rate and test temperature on superplasticity of a Zr-2.5 wt% Nb alloy
Abbreviated Journal Title
J. Nucl. Mater.
GRAIN-GROWTH; BEHAVIOR; DEFORMATION; CAVITATION; FLOW; Materials Science, Multidisciplinary; Nuclear Science & Technology; Mining & Mineral Processing
Tensile specimens of a Zr-2.5 wt% Nb pressure tube alloy were deformed at strain rates ((epsilon) over dot) of 3.2 x 10(-4)-2.9 x 10(-2) s(-1) and test temperatures (T) of 625-800 degrees C to investigate the nature of stress-strain curves and the optimum condition for superplasticity. The maximum ductility of 1384%;, was obtained at T=700 degrees C and intermediate strain rate of 3.4 x 10(-3) s(-1). The stress-strain curves were found to exhibit the dominance of flow hardening, especially in the early part of deformation, followed by how softening. The variation inductility and flow stress as a function of test condition is explained by the observed microstructural evolution and fracture behavior. (C) 1999 Elsevier Science B.V. All rights reserved.
Journal of Nuclear Materials
"Effect of strain rate and test temperature on superplasticity of a Zr-2.5 wt% Nb alloy" (1999). Faculty Bibliography 1990s. 2854.