Novel processing route for the fabrication of bulk high-entropy metal diborides

SCRIPTA MATERIALIA

卷:158

Article

Tallarita, Giovanna¹  Licheri, Roberta¹  Garroni, Sebastiano^2,3  Orru, Roberto¹  Cao, Giacomo¹ 

[1] Univ Cagliari, Dipartimento Ingn Meccan & Mat, Via Marengo 2, I-09123 Cagliari, Italy

[2] Univ Burgos, Int Res Ctr Crit Raw Mat ICCRAM, Plaza Misael Banuelos S-N, Burgos 09001, Spain

[3] Univ Burgos, Consolidated Res Unit UIC 154, Adv Mat, Nucl Technol & Appl Bio Nanotechnol, Hosp Rey S-N, Burgos 09001, Castilla Y Leon, Spain

关键词: High-entropy ceramics;    Borides;    Spark Plasma Sintering;    Self-propagating High-temperature Synthesis;    X-ray diffraction (XRD);   

DOI  :  10.1016/j.scriptamat.2018.08.039

来源: Elsevier

【 摘 要 】

A single high-entropy phase material with hexagonal structure is produced by a two-steps processing method. Elemental reactants are first remarkably converted by Self-propagating High-temperature Synthesis (SHS). The completion of the chemical transformation to the desired (Hf0.2Mo0.2Ta0.2Nb0.2Ti0.2)B-2 phase and its concurrent consolidation up to 92.5% relative density is achieved by processing the SHS powders at 1950 degrees C via Spark Plasma Sintering. It is clearly evidenced that the use of the SHS technique is extremely beneficial to promote the formation of high-entropy ceramics, as compared to the time consuming ball milling treatment alternatively adopted. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free