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Crystallization and Phase Separation of Amorphous Cu 12.5 Ni 10 Zr 41 Ti 14 Be 22.5 around the Crystallization Point as Investigated by SANS
Author(s) -
Liu JunMing,
Wiedenmann A.,
Gerold U.,
Keiderling U.,
Wollenberger H.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199702)199:2<379::aid-pssb379>3.0.co;2-a
Subject(s) - crystallization , materials science , alloy , spinodal , supercooling , phase (matter) , amorphous solid , microstructure , relaxation (psychology) , scaling , neutron scattering , thermodynamics , analytical chemistry (journal) , scattering , crystallography , chemistry , metallurgy , chromatography , optics , physics , psychology , social psychology , geometry , mathematics , organic chemistry
The small‐angle neutron scattering has been used to investigate crystallization and structural relaxation of amorphous Cu 12.5 Ni 10 Zr 41 Ti 14 Be 22.5 around the crystallization point (≈673 K). It was found that the kinetics of crystallization depended strongly on the thermal history of the alloy and was considerably slowed down in the alloy which acquired full relaxation through phase separation in the supercooled liquid range. For the fully relaxed alloy, further phase separation of the microstructure parallel with crystallization was observed at the crystallization point and demonstrated to develop via the spinodal mode. The kinetics of the phase separation again exhibited strong dependence on the thermal history of the alloy. The achieved microstructure consisted of a droplet‐like disordered phase embedded in a similarly disordered matrix. We have successfully converged the scattering events of the late stage with dynamic scaling, demonstrating the dynamic scaling property of the phase separation.