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In Situ Characterization of Lattice Structure Evolution during Phase Transformation of Zr‐2.5Nb
Author(s) -
Yan Kun,
Carr Dave G.,
Kabra Saurabh,
Reid Mark,
Studer Andrew,
Harrison Robert P.,
Dippenaar Rian,
Liss KlausDieter
Publication year - 2011
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201000350
Subject(s) - materials science , phase (matter) , thermodynamics , neutron diffraction , phase diagram , lattice constant , calphad , diffraction , lattice (music) , in situ , crystallography , analytical chemistry (journal) , crystal structure , chemistry , physics , organic chemistry , chromatography , acoustics , optics
The α–β phase transformation behavior of Zr‐2.5Nb (in mass%) has been characterized in real time during an in situ neutron diffraction experiment. The Zr‐2.5Nb material in the current study consists, at room temperature, of α‐Zr phase ( hcp ) and two β phases ( bcc ), a Nb rich β‐Nb phase and retained, Zr rich, β‐Zr(Nb) phase. It is suggested that this is related to a quench off the equilibrium solubility of Nb atoms in the Zr bcc unit cells. Vegard's law combined with thermal expansion is applied to calculate the composition of the β‐phase, which is compared with the phase diagram, revealing the system's kinetic behavior for approaching equilibrium.