EFFECT OF PROCESS AND STRUCTURAL FACTORS ON THE MECHANICAL PROPERTIES OF TITANIUM SINTERED FROM ITS HYDRIDES

Abstract

The effect of preliminary grinding and sintering temperature of titanium hydride on the mechanical characteristics of titanium was studied. The grinding rate is the dominant factor that defines the properties of titanium. The strength of titanium increased to 2470 MPa at the highest grinding energy, but its ductility decreased to 1–2%. The effect of temperature is not so simple: there are two temperature regions in which the temperature dependence of mechanical properties differs. At low sintering temperatures (780–800 ºС), the fine and active titanium particles resulting from the dissociation of hydrides lead to the rapid formation and growth of interparticle contacts. At high sintering temperatures, the densification of material increases by several times and, hence, impedes the removal of impurities from porous space. Rapid grain growth and dissolution of admixture oxygen in the titanium lattice take place in parallel, abruptly increasing the strength and decreasing the ductility of titanium. The ratio of these two processes determines the resultant mechanical properties.