High Compressibility ZrTiHfV_0.5Nb_0.5C_X Refractory High-Entropy Alloys

Abstract:

Refractory high-entropy alloys (RHEAs) have outstanding characteristics such as high melting point, high temperature oxidation resistance and corrosion resistance, which shows very promising application in the high temperature field; but commonly the refractory high-entropy alloys have the disadvantages of high density and poor plasticity. In this work, ZrTiHfV_0.5Nb_0.5C_x (x=0, 0.06, 0.12, 0.2) alloys are prepared by vacuum non-consumable arc-melting with ZrTiHfV_0.5Nb_0.5 based. The density of ZrTiHfV_0.5Nb_0.5C_0.2 alloy is reduced to 8.014g/cm³ compared to ZrTiHfV_0.5Nb_0.5 (8.135g/cm³). The microstructure, static and high-temperature compressive strength are investigated. XRD and EDS analysis show that the microstructure of ZrTiHf_0.5Nb_0.5C_x alloys consists of BCC phase and HfC phase. ZrTiHfV_0.5Nb_0.5C_x alloys have high compression plasticity with plastic strain> 40% at room temperature, no fracture occurred during compression and yield stress is closed to 1GPa.

• Periodical: Materials Science Forum (Volume 944)
• Pages: 163-168
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.163
• Online since: January 2019
• Authors: Wen Kai Chen, Yun Kai Li*, Yi Wen Chen
• Keywords: Carbon Composite, Mechanical Properties, Microstructure, Refractory High-Entropy Alloy

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