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• W4296125207 abstract "The challenge of producing a high-ductility titanium (Ti) material using inexpensive high-oxygen hydride-dehydride (HDH) Ti powder is hereby addressed by the incorporation of CaB6 oxygen-scavenger. The oxygen-scavenging behavior, microstructure evolution, mechanical behavior and improvement mechanism were systematically investigated. A continuous TiO2 oxide layer with a thickness of approximately 9.3 nm is presented on the HDH Ti powder surface. The oxide layer will dissolve into Ti matrix during sintering, making the increase of c/a value and leading to the Ti-Ti bonds developing from plastic metal bonds toward brittle covalent bonds. The CaB6 addition can scavenge O impurity and make a significant increase in tensile ductility for α-Ti matrix. A small addition of 0.2 wt.% CaB6 provides a superior tensile elongation of 22.2% for Ti material, almost three times as high as that of pure Ti (7.5%). The increase of deformation twining activity and grain refinement are responsible for the improved ductility. Furthermore, the CaB6 oxygen-scavenger can react with the surface oxide layer to in-situ form rod-like TiB and granular CaTiO3 reinforcements, refining the coarse near equiaxed grain of α-Ti matrix into fine equiaxed crystals. The multiple mechanisms of grain-boundary strengthening, load-bearing strengthening of TiB and Orowan strengthening of CaTiO3 nanoparticles work together to increase the tensile strength of Ti/CaB6 composites. This work offers an effective method to fabricate high-performance Ti material using inexpensive high-oxygen HDH Ti powder." @default.
• W4296125207 created "2022-09-17" @default.
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• W4296125207 date "2023-02-01" @default.
• W4296125207 modified "2023-10-13" @default.
• W4296125207 title "Enhanced strength and ductility in a powder metallurgy Ti material by the oxygen scavenger of CaB6" @default.
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• W4296125207 doi "https://doi.org/10.1016/j.jmst.2022.07.042" @default.
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