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High-purity Zirconium under Niobium ion implantation: possibility of a dynamic precipitation?

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Title High-purity Zirconium under Niobium ion implantation: possibility of a dynamic precipitation?
 
Creator REVELLY, AK
BECKER, HW
VISHWANADH, B
KRISHNA, KVM
TEWARI, R
SRIVASTAVA, D
DEY, GK
SAMAJDAR, I
PANWAR, AS
 
Subject X-RAY-DIFFRACTION
ZR-NB SYSTEM
PHASE-TRANSFORMATIONS
MOLECULAR-DYNAMICS
DAMAGE EVOLUTION
RESIDUAL-STRESS
THIN-FILMS
IRRADIATION
ALLOYS
RADIATION
ion damage
Zirconium
microstructure
phase transformation
residual stress
molecular dynamics (MD)
 
Description High-purity (6N purity) Zirconium was subjected to different Niobium ion (Nb+) fluences in a particle accelerator. Grazing incidence X-ray diffraction confirmed subsurface phase transformation. While an approximate scaling was noted between Nb+ fluence and quantum of phase transformation, the sample subjected to the highest ion irradiation also showed significant subsurface shear residual stresses ((13)). Molecular dynamics simulations, considering momentum transfer, revealed a drop in (13) beyond a critical displacements per atom or Nb+ fluence. High-resolution cross-sectional transmission electron microscopy (HRXTEM) confirmed formation of bcc (body-centred cubic) phase and also linked (13) with such transformation. HRXTEM revealed, at about 100nm depth, presence of 10-15% with 2-15nm size. The particles and the surrounding also had significant microscopic shear strains. The dynamic nature of the Nb implantation is expected to create fluctuations in temperature, Nb concentration and relative lattice damage. Such fluctuation, on the other hand, is/was hypothesized to dynamically alter the critical nuclei size: a clear possibility of dynamic precipitation'.
 
Publisher TAYLOR & FRANCIS LTD
 
Date 2016-01-15T08:10:12Z
2016-01-15T08:10:12Z
2015
 
Type Article
 
Identifier PHILOSOPHICAL MAGAZINE, 95(33)3727-3744
1478-6435
1478-6443
http://dx.doi.org/10.1080/14786435.2015.1085132
http://dspace.library.iitb.ac.in/jspui/handle/100/18131
 
Language en