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Coarsening of second phase in a two-phase Zr-2.5Nb: On the role of phase boundaries

DSpace at IIT Bombay

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Title Coarsening of second phase in a two-phase Zr-2.5Nb: On the role of phase boundaries
 
Creator HIWARKAR, VD
SAHOO, SK
KRISHNA, KVM
SAMAJDAR, I
DEY, GK
SRIVASTAV, D
TEWARI, R
BANARJEE, S
DOHERTY, RD
 
Subject abnormal grain-growth
2nd-phase particles
volume fraction
pressure tubes
nb alloy
simulation
evolution
kinetics
zirconium
deformation
zirconium
ebsd
two-phase
particle coarsening
phase boundary
 
Description 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.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-23T19:50:20Z
2011-12-26T12:56:34Z
2011-12-27T05:45:29Z
2011-08-23T19:50:20Z
2011-12-26T12:56:34Z
2011-12-27T05:45:29Z
2009
 
Type Article
 
Identifier ACTA MATERIALIA, 57(19), 5812-5821
1359-6454
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
 
Language en