Compressive creep of alloys of the ZrC-ZrB2 and TiC-TiB2 systems

Conclusions A study was made of the compressive creep of two-phase alloys of the ZrC-ZrB₂ and TiC-TiB₂ systems at temperatures of 1700–2420°C and stresses of 5–30 MPa. In the ZrC-ZrB₂ system two-phase alloys in a wide range of carbide phase concentrations — from 20 to 70 mole% are characterized by a creep rate exceeding by one to two orders the creep rates of their individual components, while in the TiC-TiB₂ system the highest creep rate is exhibited by alloys with carbide contents of 30–50 mole %. The effect of contamination with tungsten carbide on the creep of alloys of the systems investigated was determined. In TiC-TiB₂ alloys it is possible for coherent phase boundaries to form and for superplastic creep phenomena to manifest themselves, involving also the operation of threshold mechanisms of plastic deformation.Translated from Poroshkovaya Metallurgiya, No. 12(228), pp. 70–75, December, 1981.