In the production and storage processes of metal hydride material of TiH2, there are at least three kinds of explosion hazards, for example, TiH2 dust explosion, H(2 )explosion and hybrid H-2/TiH2 dust explosion. In this study, combustion behaviors of TiH2 dust cloud under isobaric and isochoric conditions were studied using a visual dust combustion facility and a standard 20-L spherical explosion vessel bomb, respectively, and Ti dust and hybrid H-2/Ti dust were used as the reference materials. Experimental results showed that at equal dust concentrations, the flame propagation speed S-f, burning velocity S-L, maximum pressure rise P(ex )and maximum rate of pressure rise (dP/dt)(ex) of TiH2 dust were all higher than those of Ti dust, while much smaller than those of hybrid H-2/Ti dust except the maximum pressure rise P-ex. The hydrogen state and content were the primary factors for the combustion differences of dust explosions. The values of explosion index K-st showed that the explosion risks of these samples increased as follows: Ti- < TiH2 (<) hybrid H-2/Ti dust. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.