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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/10623

Title: Coarsening of second phase in a two-phase Zr-2.5Nb: On the role of phase boundaries
Authors: HIWARKAR, VD
SAHOO, SK
KRISHNA, KVM
SAMAJDAR, I
DEY, GK
SRIVASTAV, D
TEWARI, R
BANARJEE, S
DOHERTY, RD
Keywords: abnormal grain-growth
2nd-phase particles
volume fraction
pressure tubes
nb alloy
simulation
evolution
kinetics
zirconium
deformation
Issue Date: 2009
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Citation: ACTA MATERIALIA, 57(19), 5812-5821
Abstract: Deformed two-phase Zr-2.5Nb was subjected to 700 degrees C annealing and associated coarsening. After primary recrystallization, the second-phase body-centered cubic beta was well dispersed on the grain boundaries of hexagonal alpha matrix. Prolonged annealing led to the presence of the beta, mainly at the alpha tri-junctions. The two-phase coarsening was associated with clear trends of widening in the second-phase size distribution and changes in phase boundary nature. The former is contrary to what is expected. Changes in phase boundary nature were through increased concentration of 45 degrees[0 0 1] phase boundaries-good-fit interfaces, present in larger beta particles, which were estimated to have higher three-dimensional lattice coincidence and hence lower energy. Simple analytical modeling, assuming dissolution-controlled particle coarsening and a lower interfacial energy of the phase interface with the 45 degrees[0 0 1], was shown to explain these experimental observations. (C) 2009 Acta Materialia Inc.
URI: http://dx.doi.org/10.1016/j.actamat.2009.08.007
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10623
http://hdl.handle.net/10054/10623
ISSN: 1359-6454
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