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Flow behaviour of a modified Zr-2.5wt%Nb pressure tube alloy
R.N. Singh, S. Mukherjee, R. Kishore,
Published in
Volume: 345
Issue: 2-3
Pages: 146 - 161
Anisotropy in flow behavior of cold worked and stress-relieved Zr-2.5wt%Nb pressure tube alloy was characterized by performing tensile tests in the temperature range of 298-823 K and under a constant nominal strain-rate of ∼3 × 10-4 s-1. Results showed that both yield and ultimate tensile strengths of this alloy decreased gradually with increasing test temperatures, with a rapid fall in strengths above a temperature of 623 K. The tensile ductility did not change appreciably up to 673 K but increased rapidly above this temperature. A strain energy model was developed to explain the occurrence of dynamic strain ageing (DSA). Analysis of the true stress-strain behavior suggested that the flow hardening or softening behavior of this alloy can be expressed in the form of a constitutive relationship comprising of a constant, work-hardening term and a term representing flow softening due to recovery. © 2005 Elsevier B.V. All rights reserved.
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JournalJournal of Nuclear Materials