|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||Effect of Annealing on Grain Boundary Character and Attendant Tensile Behavior of Nanocrystalline Nickel Thin Films
||Suman Dasgupta, Nora Hassan, Daniel Gianola, Kevin Hemker
|On-Site Speaker (Planned)
The deformation behavior of nanocrystalline thin films is largely influenced by the exaggerated grain boundary network present in these materials. In this study, the thermal stability of sputtered pure nickel nanocrystalline thin films was characterized in terms of the evolution of grain boundary character, grain growth and the introduction of growth twins, as determined by precession-assisted crystal orientation mapping (PACOM). The associated mechanical behavior was characterized with room temperature microtensile tests. Modest thermal treatments were observed to modify the character and distribution of GBs without significantly inducing grain growth. The attendant mechanical properties indicated an increase in tensile strength and strain hardening behavior. Heat treatments at temperatures above 573K resulted in profuse grain growth, reduced tensile strength, and a transition towards elastic-perfectly plastic flow behavior. These experimental findings will be used to discuss the prominent role that interfaces play in determining the mechanical response of nanocrystalline and ultra-fine grained metals.
||Planned: A print-only volume