Abstract
Mechanical alloying of elemental Ti and Si 3N 4 powders was conducted by high energy ball milling and solid state reactions were observed to take place during milling. An incubation period for the reaction to begin existed which was related to the critical stored energy during milling. Hot compaction of milled powders could be efficiently conducted at lower temperatures than for conventional sintering of Si 3N 4. The phases formed after sintering varied with the milling time and sintering temperature and a kinematical model has been proposed for the mechanism of phase formation. The grain size of samples sintered at 1300 °C was about 100 nm and grain growth took place at increasing sintering temperatures preferentially at Ti 5Si 3 grains. The Vickers hardness decreased monotonically with increasing test temperature, but the bending strength showed an inverse temperature dependence. Substantial plastic deformation took place at over 900 °C superplastic behaviour was observed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
