Hot deformation behavior and processing map of metal particle reinforced titanium matrix composites
The use of metal particle reinforced titanium matrix composites is beneficial to obtain high strength and maintain good plasticity,but the rheological resistance of this kind of material is high,and the hot deforma-tion processing is difficult.In this study,tungsten particle reinforced titanium matrix composites were prepared by hot pressing sintering.The hot deformation behavior of the composites at 700-1 100 ℃ and strain rate of 0.00110 s1 was studied.The hot processing map based on true strain correction was constructed,and the micro-structure evolution of the hot deformation processing was analyzed.The results show that the tungsten particles in the Ti-20W composite are uniformly distributed in the(α+β)-Ti dual-phase titanium matrix,and the interface between the two is the β-Ti phase region,which has excellent mechanical properties.The hot deformation behav-ior of Ti-20W composites has obvious partition characteristics.The deformation activation energy is 793.7 kJ/mol in the hot deformation process of(α+β)-Ti two-phase region.Dynamic recrystallization plays a major role in flow softening,and the effect is stronger than that of work hardening.The deformation activation energy is 264.6 kJ/mol in the hot deformation process of β-Ti single-phase region.Dynamic recovery plays a major role in rheological softening,and the effect is weaker than that of work hardening.According to the hot processing map,the hot processing window of Ti-20W composites is optimized,and the suitable processing parameters in the(α+β)-Ti dual-phase region are 0.2≤ε≤0.3;740 ℃≤T≤800 ℃;0.001 s-1≤(ε)≤0.015 s-1;the suitable processing parameters in the β-Ti single-phase region are ε≥0.4;975 ℃≤T≤1 100 ℃;0.001 s-1≤(ε)≤0.02 s-1.
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