粉末冶金 Ti-Fe-O 合金组织和性能影响

Ti-Fe-O alloy with excellent comprehensive mechanical properties is prepared using resource rich Fe₂O₃ as a strengthening agent and pure Ti powder as raw material，based on ball milling powder mixing，electric field assisted hot pressing sintering technology，and hot rolling process. The impacts of Fe_2O3 content and the particle size of Ti powder on the microstructure and quasi-tatic tensile properties of the Ti-Fe-O alloys is investigated. The research reveals that an increase in Fe_2O3 content and a decrease in Ti powder size facilitate the formation of the β phase and refine the α phase grains within the alloy. Hot rolling leads to a significant enhancement in the comprehensive mechanical properties of Ti-Fe-O alloys. The strength improvement is attributed to the interstitial solid-solution strengthening by O elements，grain refinement strengthening resulting from the refinement of the α phase，and the precipitation strengthening of nano-scale acicular secondary α phase within the β phase. Under the condition where the pure Ti particle size ranges from 15 μm to 45 μm（D₃₀），the as-rolled Ti-0.71%Fe_2O3（Ti-0.58Fe-0.29O）and Ti-1.43% Fe₂O₃（Ti-1.08Fe-0.62O） alloys achieve an excellent strength-plasticity matching effect. Their tensile strengths and elongations at break reach 975 MPa with 20.6% elongation and 1128 MPa with 18.4% elongation，respectively.