TY - JOUR

T1 - HfB2 ceramic polycrystals: A low-temperature metal-like ceramic at high temperatures?

AU - Zapata-Solvas, Eugenio

AU - Moshtaghioun, Bibi Malmal

AU - Gómez-García, Diego

AU - Domínguez-Rodríguez, Arturo

AU - Lee, William E.

PY - 2021/10

Y1 - 2021/10

N2 - Hafnium diboride (HfB2) is a highly refractory (melting above 3000°C) ceramic with many potential applications at high temperatures. To enable its use at temperature for extended periods its high-temperature plasticity must be known. This paper examines the mechanical response at temperatures between 900°C and 2000°C in air and in a reducing atmosphere, interpreting the data in the frame of classical models for the plasticity of compact-packed metals at low temperatures. In particular, the Friedel law and the principle of similitude for dislocation patterning are assessed. This reveals that HfB2 is a singular example of a ceramic material with “metal” mechanical behaviour.

AB - Hafnium diboride (HfB2) is a highly refractory (melting above 3000°C) ceramic with many potential applications at high temperatures. To enable its use at temperature for extended periods its high-temperature plasticity must be known. This paper examines the mechanical response at temperatures between 900°C and 2000°C in air and in a reducing atmosphere, interpreting the data in the frame of classical models for the plasticity of compact-packed metals at low temperatures. In particular, the Friedel law and the principle of similitude for dislocation patterning are assessed. This reveals that HfB2 is a singular example of a ceramic material with “metal” mechanical behaviour.

KW - HfB

KW - Mechanical properties

KW - Zero-strain rate sensitivity

U2 - 10.1016/j.scriptamat.2021.114037

DO - 10.1016/j.scriptamat.2021.114037

M3 - Article

VL - 203

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

M1 - 114037

ER -