Evolution of Microstructure of Full Lamellar Titanium Alloy BT18Y Solutionized At Phase Field
YANG Yi; XU Feng; HUANG Aijun; LI Geping
Institute of Metal Research; The Chinese Academy of Sciences; Shenyang110016
Cite this article:
YANG Yi; XU Feng; HUANG Aijun; LI Geping. Evolution of Microstructure of Full Lamellar Titanium Alloy BT18Y Solutionized At Phase Field. Acta Metall Sin, 2005, 41(7): 713-720 .
Abstract BT18Y titanium alloy was treated with several groups of heat treatment.
After solutionized frectment at phase field,
metalloscopy, transmission electron Microscope (TEM)
and scanning electron microscopy (SEM) were employed to observe
the microstructures. It was found that the continuous grain boundary
(GB) phase is spheroidizes and the edges of some intragranular
primarylaths show “forked” morphology. The ultimate
reason of the spheroidization of GB is the diffusion of solute
atoms due to the difference of solute concentration, which results from
the different interfacial
curvatures at different sites.
The joint of two GB
lamellas also gives some contribution to the spheroidization of GB .
The “forked” morphology at the edge of primary lath
results from different interfacial structures and energies between
phase and different parts oflath. The incoherent interface
between phase and the edge of lath has
high interfacial energy and moves easily. When the alloy is solutionized at
phase field, phase trends to grow into
lath and forms lath, which results the “forked”
morphology of primary lath.
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