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The Segregation in Molybdenum Alloy

Three dimensional atom-probe measurements have been carried out to study the segregation behaviour of molybdenum alloy. As predicted from alloy thermodynamics, on in situ annealed specimens a significant surface enrichment of molybdenum has been observed.

For alloys with tungsten contents above 25% the composition profiles measured are in a good agreement with the theoretical predictions. The positive regular solution parameter of this binary system gives reason for a random distribution of alloy components.

In the three-dimensional reconstructions local agglomerations and combined features of tungsten atoms are to observe in alloys with molybdenum as major component.


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