Abstract
Room-temperature brittleness of pressureless sintered (PLS) titanium matrix composites is always a bottleneck for their engineering application. Herein, we report a novel powder metallurgy strategy to overcome this challenge by evading Kirkendall's pores. Specifically, the strategy mainly involves the coating of nanosized TiB2 powder with stearic acid and subsequent reactive sintering with micron-sized TiH2 powder. Interestingly, the TiBw/Ti composites prepared by PLS attain a nearly full density, whose porosity is as low as ~1.22%. Resultantly, the PLS composites exhibit large tensile plasticity as well as high strength, comparable or even superior to corresponding one of some ceramic phase-reinforced pure Ti matrix composites fabricated by pressure-assisted sintering or thermomechanical post-treatments.
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