Morphology of W fibers and kinetic undercooling in directionally solidified NiAl–W eutectic alloy

Morphology of W fibers and kinetic undercooling in directionally solidified NiAl–W eutectic alloy The relationship between the cross-sectional shape of W fibers and kinetic undercooling in directionally solidified (DS) NiAl–W eutectic alloys was investigated. When the growth rate was less than 8 µm/s, the cross-sectional shape of W fibers was hexagonal (faceted); conversely, when the growth rate was more than 8 µm/s, their cross-sectional shape was elliptical (nonfaceted). Meanwhile, the NiAl matrix and W fibers in DS NiAl–W eutectic alloys presented a particular crystallographic orientation. The crystallographic orientation between NiAl matrix and W fibers was [ $$ \bar{1} $$ 1 ¯ 11]NiAl//[200]W in the growth rate of 6 µm/s, and [ $$ \bar{1} $$ 1 ¯ 11]NiAl//[ $$ \bar{1} $$ 1 ¯ 11]W in the growth rate of 8 µm/s. A critical kinetic undercooling $$ \Delta T_{k,W}^{c} $$ Δ T k , W c can be used to predict the transition from the faceted to nonfaceted growth of W fibers in DS NiAl–W eutectic alloys. When the kinetic undercooling $$ \Delta T_{k} $$ Δ T k of the W phase was less than $$ \Delta T_{k,W}^{c} $$ Δ T k , W c , the W fibers’ growth was faceted with a hexagonal shape, whereas when $$ \Delta T_{k} > \Delta T_{k,W}^{c} $$ Δ T k > Δ T k , W c , the W fibers exhibited nonfaceted growth with elliptical shape. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Morphology of W fibers and kinetic undercooling in directionally solidified NiAl–W eutectic alloy

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-018-2466-2
Publisher site
See Article on Publisher Site

Abstract

The relationship between the cross-sectional shape of W fibers and kinetic undercooling in directionally solidified (DS) NiAl–W eutectic alloys was investigated. When the growth rate was less than 8 µm/s, the cross-sectional shape of W fibers was hexagonal (faceted); conversely, when the growth rate was more than 8 µm/s, their cross-sectional shape was elliptical (nonfaceted). Meanwhile, the NiAl matrix and W fibers in DS NiAl–W eutectic alloys presented a particular crystallographic orientation. The crystallographic orientation between NiAl matrix and W fibers was [ $$ \bar{1} $$ 1 ¯ 11]NiAl//[200]W in the growth rate of 6 µm/s, and [ $$ \bar{1} $$ 1 ¯ 11]NiAl//[ $$ \bar{1} $$ 1 ¯ 11]W in the growth rate of 8 µm/s. A critical kinetic undercooling $$ \Delta T_{k,W}^{c} $$ Δ T k , W c can be used to predict the transition from the faceted to nonfaceted growth of W fibers in DS NiAl–W eutectic alloys. When the kinetic undercooling $$ \Delta T_{k} $$ Δ T k of the W phase was less than $$ \Delta T_{k,W}^{c} $$ Δ T k , W c , the W fibers’ growth was faceted with a hexagonal shape, whereas when $$ \Delta T_{k} > \Delta T_{k,W}^{c} $$ Δ T k > Δ T k , W c , the W fibers exhibited nonfaceted growth with elliptical shape.

Journal

Journal of Materials ScienceSpringer Journals

Published: May 29, 2018

References

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