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Development of eutectic high entropy alloy by addition of W to CoCrFeNi HEA
Orientador(es)
Resumo(s)
High entropy alloys have shown a remarkable combination of physical and mechanical properties. The introduction
of eutectic microstructure, consisting of a tough fcc phase, and a hard-intermetallic phase, can help in
obtaining even better synergy of strength and ductility. The presence of multiple principal alloying elements in
HEAs and absence of corresponding multicomponent phase diagrams makes designing of eutectic high entropy
alloys a tedious task. In the present study, systematic investigation of CoCrFeNi-Wx system has been carried out
for the development of eutectic microstructure. Experimental results validated the presence of eutectic reaction
in the calculated phase diagram. CoCrFeNi-Wx HEAs remained single fcc phase alloys at smaller amount of W (x
= 0.1) but changed to hypoeutectic (x = 0.25, 0.5, 0.75) and hypereutectic alloys (x = 1.0) with increase in the
amount of tungsten. It has been shown that calculated pseudo binary phase diagrams can provide a very good
starting point for the development of eutectic HEAs. Mechanical characterization of the developed HEAs revealed
that development of eutectic mixture of a soft (fcc) and a hard phase (intermetallic/bcc) can help in obtaining
outstanding combination of mechanical properties.
Descrição
Palavras-chave
Eutectic high entropy alloys Scanning electron microscopy XRD Strength Ductility Compression test
Contexto Educativo
Citação
Editora
Elsevier Ltd.