|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||Gradient Nanostructure and Mechanical Behavior of Ultrasonic Shot Peened Ti-6Al-4V
||Fei Yin, Hannah Han, Qingyou Han
|On-Site Speaker (Planned)
A gradient nanostructured surface layer was developed on a Ti-6Al-4V sample by using ultrasonic shot peening. The microstructure, nanohardness and Young’s modulus of the gradient nanostructured surface layer was characterized and measured by field emission Scanning Electron Microscope (FESEM) and nanoindenter, respectively. The average grain size at the topmost surface layer of the ultrasonic shot peened Ti-6Al-4V is around 153.68nm. Relationship between the mechanical performance and microstructure of the gradient nanostructured Ti-6Al-4V was evaluated and discussed. Research results indicated that the average nanohardness and Young’s Modulus of the nanostructured Ti-6Al-4V has been increased by 42% and 15.6%, respectively compared to the initial coarse grained Ti-6Al-4V. The increased nanohardness and Young’s Modulus at the surface layer is attributed to the grain refinement after ultrasonic shot peening because grain boundaries will block dislocation movement when materials undergo plastic deformation. This study suggested that ultrasonic shot peening can be used as an effective method for surface nanocrystallization and mechanical strengthen of the Ti-6Al-4V.
||Planned: Supplemental Proceedings volume