In-situ dual-deoxidation design of advanced titanium matrix composites by pressureless sintering

Authors：Chen, T.; Cai, W. S.; Liu, Z.; Ma, H. W.; Qu, S. G.; Zhang, W. W.; Yang, C.^*

Source：Composites Part B: Engineering , 2022, 244: 110202.

DOI：10.1016/j.compositesb.2022.110202

• Metal -matrix composites (MMCs)
• Microstructure
• Mechanical properties
• Sintering
• Titanium hydride

We establish a methodology of in-situ dual-deoxidation to fabricate advanced titanium matrix composites (TMCs) by pressureless sintering (PLS). Specifically, the in-situ dual-deoxidation of impurity O in Ti matrix was designed as the in-situ formation of H2O and La2O3 particles, which was accomplished by PLS of advanced TMCs from powder mixtures containing Ti-6Al-4V matrix of TiH2 and 60Al40V together with LaB6 addition. Interestingly, the advanced TMCs with in-situ La2O3 particle and TiB whisker have various merits, including the significantly reduced O content in the Ti matrix, the refined equiaxed alpha-Ti grain with monolayer nanosized L phase grain boundary, and especially the nearly full-density evading Kirkendall's pore. Resultantly, the advanced TMCs circumvent the strength-ductility trade-off of representative Ti-6Al-4V TMCs by various materials processing methods. Our results provide a novel strategy for fabricating cost-effective advanced TMCs by PLS to yield su-perior mechanical properties.