Abstract
In this work, the performance of the carbon doped compositionally complex alloy (CCA) MoNbTaW was studied under ambient and high pressure and high temperature conditions. TaC and NbC carbides were formed when a large concentration of carbon was introduced while synthesizing the MoNbTaW alloy. Both FCC carbides and BCC CCA phases were detected in the sample compound at room temperature, in which the BCC phase was believed to have only refractory elements MoNbTaW while FCC carbide came from TaC and NbC. Carbides in the carbon doped MoNbTaW alloy were very stable since no phase transition was obtained even under 3.1 GPa and 870 °C by employing the resistor-heating diamond anvil cell (DAC) synchrotron X-ray diffraction technique. Via in situ examination, this study confirms the stability of carbides and MoNbTaW in the carbon doped CCA even under high pressure and high temperature.
Highlights
High entropy alloy (HEA) has drawn increasing attention because a combination of different elements can build a simple microstructure which has promising properties [1,2,3,4,5,6,7]
In this work, carbon doped MoNbTaW was synthesized by ball milling and studied under various temperatures at 3.1 GPa
Carbon doped MoNbTaW was synthesized by ball milling and studied under various temperatures at 3.1 GPa
Summary
High entropy alloy (HEA) has drawn increasing attention because a combination of different elements can build a simple microstructure which has promising properties [1,2,3,4,5,6,7]. HEAs are defined as alloys with at least four or more principal elements which have a concentration between 5% and 35 at%, where the properties of HEA may be tunable based on the elements contained. Being more broadly defined than traditional HEAs, compositionally complex alloys (CCAs) may have more than one phase in the microstructures, in which the secondary phase can be precipitate, ordered, disordered, or amorphous phase [8,9]. HEAs/CCAs were generally explored by changing one element in the existing alloy or by adding additional elements with the purpose of enhancing performance such as mechanical properties of alloys. The Al element was claimed to be the key factor influencing the microhardness [10]
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