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HomeMaterials Science ForumMaterials Science Forum Vol. 508On a Morphological Transition in Monotectic...

On a Morphological Transition in Monotectic Solidification

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Abstract:

Al-Bi and Al-In of exact monotectic composition were directionally solidified with solidification velocities ranging from 0.3 µm/sec to 5 µm/sec and temperature gradients from 2 K/mm to 6.5 K/mm. Three distinct microstuctures could be observed: fibers, strings of pearls or irregular arrays of second phase droplets. The transitions from fibers to strings of pearls is discussed theoretically and compared with the experimental results. The origin of this transition seems to be a Nichols and Mullins instability of the fibers during cooling from the monotectic to the eutectic temperature caused by surface perturbations driving volume diffusion of solute in the liquid fibers of the second phase.

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Periodical:

Materials Science Forum (Volume 508)

Pages:

93-98

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.508.93

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Online since:

March 2006

Authors:

Anja Müller, Lorenz Ratke

Keywords:

Directional Solidification, Immiscible Alloys, Morphology Transitions in Monotectic Alloys, System Al-Bi, System Al-In

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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