2024 article

A super-hard high entropy boride containing Hf, Mo, Ti, V, and W

Filipovic, S., Obradovic, N., Hilmas, G. E., Fahrenholtz, W. G., Brenner, D. W., Maria, J.-P., … Curtarolo, S. (2024, March 23). JOURNAL OF THE AMERICAN CERAMIC SOCIETY.

By: S. Filipovic *, N. Obradovic *, G. Hilmas *, W. Fahrenholtz *, D. Brenner n, J. Maria*, D. Wolfe *, E. Zurek *, X. Campilongo *, S. Curtarolo *

author keywords: borides; hardness; scanning electron microscopy; spark plasma sintering
Source: Web Of Science
Added: April 1, 2024

AbstractSuper‐hard (Hf,Mo,Ti,V,W)B2 was synthesized by boro‐carbothermal reduction and densified by spark plasma sintering. This composition was produced for the first time as a single‐phase ceramic in the present research. The optimized ceramic had a single hexagonal AlB2‐type crystalline phase with a grain size of 3.8 µm and homogeneous distribution of the constituent metals. The Vickers hardness exhibited the indentation size effect, increasing from 27 GPa at a load of 9.8 N to as high as 66 GPa at a load of 0.49 N. This is the highest hardness reported to date for high entropy boride ceramics.