In search of amorphization-resistant boron carbide

SCRIPTA MATERIALIA

卷:123

Article

Subhash, Ghatu¹  Awasthi, Amnaya P.¹  Kunka, Cody¹  Jannotti, Phillip²  DeVries, Matthew¹ 

[1] Univ Florida, Mech & Aerosp Engn, Gainesville, FL 32611 USA

[2] US Army, Res Labs, Aberdeen, MD 21005 USA

关键词: Boron carbide;    Polymorph;    Amorphization resistance;    Raman spectra;    Cage-space;    DFT;   

DOI  :  10.1016/j.scriptamat.2016.06.012

来源: Elsevier

【 摘 要 】

Despite its superior mechanical properties, boron carbide suffers from amorphization, a pressure-induced phenomenon that disturbs crystalline order and likely reduces shear strength. Numerous experimental and computational studies have investigated the structure and origins of amorphization, yet strategies to mitigate this deleterious phenomenon elude. However, recent investigations have revealed three new research avenues for addressing this issue. First, we identify crystallographic cage spaces that may accommodate foreign atoms to potentially prevent structural collapse. Second, we propose polymorph-level tailoring through strict control of processing conditions. Finally, we demonstrate that reducing grain size to nanometer scale increases hardness and may counter amorphization. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free