What is it about?
High entropy alloys (HEA) is the name given to a new "mode" in Materials Science (just as Bulk Metallic Glasses and, more recently, Graphene, have been). The concept is based on the (wrong) idea that the thermodynamics of a multicomponent alloy would be dominated by the configurational entropy (the one which is generated simply by mixing different kinds of atoms) and stated that this would cause a stability of disordered solid solutions. We show this is wrong, although a stabilizing effect exist in multicomponent systems (with more than 4 components).
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Why is it important?
Sometimes an improper idea is launched as explanation to some phenomenon and somehow this survives, uncovering the truth is important because the wrong idea results in wrong assumptions and then is wrong ideas. For example, the (wrong) supposition that the entropy is the responsible for the stabilization of the disordered solid solution leads to the false conclusion that the composition of the alloy must remain in the equiatomic region (that is, all components have the same composition). Our results show that entropy is not the relevant factor, so there is no reason to remain in this composition.
Perspectives
This is surely one of the most important works I ever published and is the first result of my partnership with Prof. Raymundo Arroyave at the Texas A&M University. It was a pleasure working in this manuscript.
Professor Claudio Geraldo Schön
Universidade de Sao Paulo Campus da Capital
Read the Original
This page is a summary of: Probing the entropy hypothesis in highly concentrated alloys, Acta Materialia, April 2018, Elsevier,
DOI: 10.1016/j.actamat.2018.01.028.
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