# 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

, Volume 53 (17) – May 29, 2018
11 pages

/lp/springer_journal/morphology-of-w-fibers-and-kinetic-undercooling-in-directionally-QyBiFB4ndZ
Publisher
Springer US
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

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