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Microstructure and Mechanical Properties of Equiatomic and Non-Equiatomic TiMoTaNbV High Entropy Alloys Prepared Using Vacuum Arc Remelting

Lee Seongi, Lee Kwangmin

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 4

1311--1315

This study investigates the microstructures and the mechanical properties of equiatomic Ti20 Mo20 Ta20 Nb20 V20 and non-equiatomic Ti40 Mo15 Ta15 Nb15 V15 and Ti60 Mo10 Ta10 Nb10 V10 HEAs using X-ray diffraction (XRD) analysis, field emission scanning electron microscope (FE-SEM), and micro-Vickers hardness test. The specimens were fabricated using the vacuum arc remelting (VAR) process and homogenized at a temperature of 1300°C for 4 h in a vacuum atmosphere. The determined thermodynamic parameters, Ω ≥ 1.1, δ ≤ 6.6%, and VEC < 6.87, suggested that the HEAs consisted of BCC solid solutions. XRD patterns of all the HEAs displayed single BCC phases. The difference in the solidification rate led to the micro-segregation associated with the elements Ta and Mo enriched in the dendrite arms and the elements V and Ti in the inter-dendritic regions. The HEA specimens showed a decrease in hardness with higher concentration of Ti element because the intrinsic hardness of Ti is lower as compared to the intrinsic hardness of Nb and Mo.