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

Hiwarkar, V. D. ; Sahoo, S. K. ; Mani krishna, K. V. ; Samajdara, I. ; Dey, G. K. ; Srivastav, D. ; Tewari, R. ; Banerjee, S. ; Doherty, R. D. (2009) Coarsening of second phase in a two-phase Zr-2.5Nb: on the role of phase boundaries Acta Materialia, 57 (19). pp. 5812-5821. ISSN 1359-6454

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Deformed two-phase Zr-2.5Nb was subjected to 700° C annealing and associated coarsening. After primary recrystallization, the second-phase body-centered cubic β was well dispersed on the grain boundaries of hexagonal β matrix. Prolonged annealing led to the presence of the β, mainly at the β 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°[001] phase boundaries-good-fit interfaces, present in larger β 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°[001], was shown to explain these experimental observations.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Zirconium; EBSD; Two-phase; Particle Coarsening; Phase Boundary
ID Code:9635
Deposited On:02 Nov 2010 11:37
Last Modified:14 May 2011 05:14

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