EFFECT OF CHROMIUM DIBORIDE ADMIXTURES ON THE STRENGTH OF NiAl–CrB₂ COMPOSITES IN A WIDE COMPOSITION RANGE

Abstract

The compressive yield stress and bending strength of NiAl–CrB₂ composites has been studied in the 20–800 °C range. The effect of the composite phase ratio and experimental temperature on the composite strength for different loading patterns has been established. Under the tensile stresses, the introduction of 15 wt.% CrB₂ into the intermetallide is optimum to ensure the maximum bending strength at 500 °С. The bending strength of NiAl–15 wt.% CrB₂ composite at experimental temperature 500 °C is three times higher than that of starting NiAl.