Abstract
In this study, bulk samples of a CrMoNbWV high-entropy alloy (HEA) were obtained for the first time by spark plasma sintering (SPS) of mechanically alloyed (MA) powders at 1200 °C, 1300 °C, and 1400 °C. Microstructure evolution, phase formation as well as wear and corrosion behavior were investigated. The MA powders’ phase composition was found to be represented by body-centered-cubic (BCC) solid solution. The solid solution partially decomposed to Laves phases under the sintering, such as Cr2Nb and (Fe, Cr)Nb, and NbVO4-VO oxides mixture. The temperature increase to 1400 °C led to a grain coarsening of the BCC phase and decreased the Laves phase content accompanied by precipitation at the grain boundaries. The sintered samples showed high hardness and compressive strength (2700–2800 MPa) at room temperature. The wear tests demonstrated excellent results in comparison to conventional wear-resistant composites. The obtained samples also exhibited high corrosion resistance under electrochemical tests in H2SO4 solution. The CrMoNbWV HEA has comparable mechanical and corrosive properties with the WNbMoTaV type HEA, but at the same time has a reduced density: CrMoNbWV—10.55 g/cm3, WNbMoTaV—12.42 g/cm3.
Highlights
One of the most promising and progressive fields in modern material science is highentropy alloys (HEAs)
The results showed that the chemical stability of the carburized layer increases with increasing sintering temperature.HEA samples, obtained at 1200 °C (a), 1300 °C (b), 1400 °C (c)
The HEA conception supposed the formation of a single-phase solid solution provided by high mixing entropy of the components
Summary
One of the most promising and progressive fields in modern material science is highentropy alloys (HEAs). The first to propose HEAs’ concept was J.W. Yeh [1], but since it has changed rather significantly, especially during the last few years [2]. Yeh [1], but since it has changed rather significantly, especially during the last few years [2] Due to their extremely high mechanical and physical properties, refractory HEAs are classified as a separate group of materials. Such alloying compositions mainly include elements from the IV, V, and VI columns of the periodic table with some additions of Al, Si, Ni, or Co [3]. There are known refractory elements-based HEAs with high wear-resistance [9], corrosion resistance [10], and plasticity [11]
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