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Phase equilibria in VCrMnFeCo equiatomic high entropy alloys with a Body Centered Cubic structure

Grant number: 19/07305-8
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): June 01, 2019
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Francisco Gil Coury
Grantee:Vitor Gonçalves Lemes de Sousa
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys, AP.TEM


Multicomponent, complex and concentrated or high entropy alloys (HEAs) are denominations of a new class of materials that do not have the main element. The major class of HEAs currently under development involves 3d transition metals from the periodic table. The development of these alloys focused almost exclusively on searching for compositions with a high probability of forming a face-centered cubic (FCC) phase. Several compositions with excellent mechanical properties were found with that structure. On the other hand, only a few single-phase compositions with a body-centered cubic structure (BCC) were designed and produced in that family. In particular, few alloys with Vanadium were produced and none were designed with the specific intention of obtaining a CCC phase. In this work, a systematic study will be made to find single-phase BCC alloys in the VCrMnFeCo system, which is still unexplored in the literature. Four compositions of this system were chosen to be produced by arc furnace casting. They will be studied in the homogenized and as-cast conditions by optical microscopy, X-ray diffraction, and Vickers microhardness. The results of this work will contribute to the understanding of the BCC HEAs made from 3d transition metals and their potential applications.