Microstructural evolution and mechanical properties of TiC-Mo2C-WC-Ni multi-component powder by high energy ball milling
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The widespread use of TiC-based cermets as cutting tools, thin-film, ultracapacitors, nozzles, and bearings is primarily dueto exhibit combination of excellent mechanical properties such as low density, high hardness, and stiffness. The TiC cermetswere synthesized by high energy ball milling, which includes binder metal (Ni), carbides (WC and Mo2C), wherein the presentstudy focus on the relationship between the core-rim structure, phase constitution, and mechanical properties. Here, using insitu TEM, we clearly observed the behavior of adjacent core-rim formation from the solid-phase reaction with grainrefinement of the TiC phase control of both the milling time and lattice formation. Also, we proposed that mechanically alloyedcore-rim structure can affect oxidation resistance of TiC-Mo2C-WC-Ni cermets strongly related to activation energy attributedto TiC particle size. The mechanical properties of TiC-Mo2C-WC-Ni cermets suggest the hardening effect is not consideredonly grain refinement, but rather is solid solution strengthening and particle-dispersion hardening. The present study pavesthe relation to the formation behavior of both TiC hard phase and core-rim structure due to the mechanical powder synthesisof novel TiC-based cermets.
Abstract
The widespread use of TiC-based cermets as cutting tools, thin-film, ultracapacitors, nozzles, and bearings is primarily dueto exhibit combination of excellent mechanical properties such as low density, high hardness, and stiffness. The TiC cermetswere synthesized by high energy ball milling, which includes binder metal (Ni), carbides (WC and Mo2C), wherein the presentstudy focus on the relationship between the core-rim structure, phase constitution, and mechanical properties. Here, using insitu TEM, we clearly observed the behavior of adjacent core-rim formation from the solid-phase reaction with grainrefinement of the TiC phase control of both the milling time and lattice formation. Also, we proposed that mechanically alloyedcore-rim structure can affect oxidation resistance of TiC-Mo2C-WC-Ni cermets strongly related to activation energy attributedto TiC particle size. The mechanical properties of TiC-Mo2C-WC-Ni cermets suggest the hardening effect is not consideredonly grain refinement, but rather is solid solution strengthening and particle-dispersion hardening. The present study pavesthe relation to the formation behavior of both TiC hard phase and core-rim structure due to the mechanical powder synthesisof novel TiC-based cermets.
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