Solution Hardening of Titanium Carbide by Molybdenum

In order to investigate the mechanism of solid solution hardening of titanium carbide by molybdenum, single crystals of various compositions were grown by the r.f. floating zone technique and were deformed by compression at temperatures from 1270 to 2270 K and at strain rates from 5×10−5 to 7×10−3 s−1.Plastic flow behavior of the crystals was found to be clearly different among three temperature ranges—low, intermediate and high temperature ranges—whose boundaries were dependent on the strain rate. From the observed behavior, it is considered that the deformation in the low temperature range is controlled by the Peierls mechanism, that in the intermediate temperature range by the dynamic strain aging and that in the high temperature range by the solute atmosphere dragging mechanism.