DEVELOPMENT OF SYNTHESIS METHOD FOR SINGLE-PHASE HIGH-ENTROPY CERAMIC MATERIALS WITH A HIGH DEGREE OF CHEMICAL HOMOGENEITY ON THE EXAMPLE OF EQUIATOMIC HIGH-ENTROPY CARBIDE (TIZRHFTANB)C

Материаловедение. Энергетика

Makhmutov Tagir¹  Razumov Nikolay¹  Popovich Anatoliy¹ 

[1] Peter the Great St. Petersburg Polytechnic University;

关键词: high-entropy alloys;    ceramics;    carbides;    mechanical alloying;    spark plasma sintering;   

DOI  :  10.18721/JEST.27310

来源: DOAJ

【 摘 要 】

The paper presents the synthesis results of high-entropy carbides using pre-mechanically alloyed powders of high-entropy alloys (HEA). The use of HEA as a starting material for synthesizing high-entropy ceramics allows obtaining one-phase and chemically homogeneous high-entropy carbides due to preliminary mixing of metals at the atomic level, accompanied by the formation of a single-phase solid solution. We showed that in the process of sintering a mechanical mixture of pre-mechanically alloyed HEA powders with graphite at temperatures of about 1600°C, high-entropy carbide with the chemical formula MeC and space group Fm-3m is formed. However, according to the phase composition and microstructure analysis, inclusions are formed in the form of zirconium-hafnium oxide and a transition layer between oxide inclusions and the main carbide phase. Raising the temperature up to 2000°C produces a single-phase and chemically homogeneous high-entropy carbide (TiZrHfTaNb)C.

【 授权许可】

Unknown