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The “Solidification” of Grain Boundaries with Increasing Temperature

Published online by Cambridge University Press:  15 February 2011

Witold Lojkowski  and
Bogdan Palosz
Witold Lojkowski
Affiliation:
High Pressure Research Center, Polish Academy of Sciences, Sokolowska 29, 01–142 Warsaw, Poland
Bogdan Palosz
Affiliation:
High Pressure Research Center, Polish Academy of Sciences, Sokolowska 29, 01–142 Warsaw, Poland
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Abstract

The aim of the paper is to explain the recently observed de-wetting grain boundary transition with increasing temperature. On the example of a bicrystal from the Fe-6at.%Si alloy, it was found recently that as temperature is increased, the following GB transitions take place: “solid” (or regular) GB-→“premelted” GB →“solid” GB. At the same time the wetting/de-wetting transitions have taken place. Another example of such GB behavior was discovered during sintering of alumina. The inverse melting behavior is explained as follows: low melting point impurities cause GB premelting at low temperatures, However de-segregation of impurities at high temperatures causes return of the GB structure to its regular “solid” state.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 337
Copyright
Copyright © Materials Research Society 1995

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