• Marchenko, Ekaterina
• Verkhoshanskiy, Yanis
• Zhukov, Ilya
• Belchikov, Ivan
• Vorozhtsov, Alexander
• Tkachev, Dmitrii

Abstract

<jats:title>Abstract</jats:title><jats:p>AlMgB<jats:sub>14</jats:sub> materials were obtained by hot-pressing of the prereacted AlMgB<jats:sub>14</jats:sub> powder. The phase composition, structure, hardness and flexural strength have been studied. The XRD studies shown that the phase composition of the obtained materials contains from 9 to 12 wt. % of the spinel MgAl<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> phase except target AlMgB<jats:sub>14</jats:sub>-phase. The spinel content increases linearly with an increase in the hot-pressing temperature from 1400 °C to 1600 °C. It was found that the density of the studied materials non-linearly depends on the hot-pressing temperature. An increase in the hot-pressing temperature from 1400 °C to 1500 °C leads to an increase in the relative density of the samples from 84% to 93%, respectively. A further increase in the hot-pressing temperature to 1600 °C leads to a decrease in the relative density to 81% due to the complication of the densification processes with an increase in the spinel content. An increase in the relative density from 81% to 93% leads to an increase in the flexural strength from 121 to 314 MPa and an increase in the Vickers microhardness from 5.1 to 7.9 GPa, respectively.</jats:p>

Topics

• density
• phase
• x-ray diffraction
• strength
• flexural strength
• hardness
• ceramic
• densification