MEASUREMENT AND ANALYSIS OF THE STRENGTH OF MO-TIC COMPOSITES IN THE TEMPERATURE-RANGE 285 K-2270 K

(Ti//0//. //7//4Mo//0//. //2//6)C//0//. //9//6 ( delta phase) and Mo-1. 5Ti-1. 2C ( beta phase) solid solutions and hypo Mo-10TiC and hyper Mo-40TiC eutectic composites were deformed by compression from 285 to 2270 K and strain rate range from 5 multiplied by 10** minus **5 to 7 multiplied by 10** minus **3 s** minus **1. The high strength of the lamellar eutectic composite is due primarily to solution hardening of TiC by Mo. The delta phase undergoes appreciable plastic deformation at 1470 K and above at 0. 2% plastic strain. The yield strength up to 1470 K is explained by the rule of mixtures. The magnitude of internal stresses is evaluated on the assumption that both components are equally strained. Above 1470 K, however, the yield strength is larger than the measured strength, indicating that the effects of recovery of internal stress and phase boundary sliding become significant at such high temperatures.