Abstract
Morphology evolution of prior \beta grains of laser solid forming (LSF)
Ti-xAl-yV (x \leq 11,y \leq 20) alloys from blended elemental powders is
investigated. The formation mechanism of grain morphology is revealed by
incorporating columnar to equiaxed transition (CET) mechanism during solidification.
The morphology of prior \beta grains of LSF Ti-6Al-yV changes from columnar to
equiaxed grains with increasing element V content from 4 to 20 wt.-%. This agrees
well with CET theoretical prediction. Likewise, the grain morphology of LSF
Ti-xAl-2V from blended elemental powders changes from large columnar to small
equiaxed with increasing Al content from 2 to 11 wt.-%. The macro-morphologies of
LSF Ti-8Al-2V and Ti-11Al-2V from blended elemental powders do not agree with CET
predictions. This is caused by the increased disturbance effects of mixing enthalpy
with increasing Al content, generated in the alloying process of Ti, Al, and V in
the molten pool.
© 2011 Chinese Optics Letters
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