|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||W-33: Plastic Deformation in Nanocrystalline TiN at Ultra-low Stress: An In Situ Nanoindentation Study
||Jie Jian, Haiyan Wang, Xinghang Zhang
|On-Site Speaker (Planned)
It is well adopted that a majority of ceramic materials have low ductility and plastic yielding in crystalline ceramics occurs succeeding elastic deformation. Here by using in situ nanoindentation we show, however, that in nanocrystalline TiN, ample non-elastic events, such as grain rotation and grain boundary (GB) sliding, occur at ultra-low stresses (< 1 GPa) well before the plastic yielding events. Furthermore by performing in situ nanoindentation on TiN with different average grain sizes of 110 nm, 35 nm and 20 nm, we observed a prominent grain size effect: that is specimens with smaller average grain sizes possess greater non-elastic deformation than their counterparts with larger grains. This in situ nanoindentation study thus provides new perspectives on understanding plasticity of hard nanocrystalline ceramics at room temperature.
||Planned: A print-only volume