|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Multiscale Architectured Materials (MAM II): Tailoring Mechanical Incompatibility for Superior Properties
||L-173: Fabrication of Functionally Graded Materials via Asymmetric Cold Rolling
||Tyler Harrington, Jordan Furlong, Roxan Afshari, Chaoyi Zhu, Kenneth Vecchio
|On-Site Speaker (Planned)
Asymmetric cold rolling and recrystallization are used to produce a functionally graded structure in Fe and Ti samples that can be used to quantify the correlation between geometrically necessary dislocations (GND’s) and recrystallized grain size. Samples are rolled to various reductions in thickness to induce non-uniform strain hardening throughout the sample, which is measured using hardness profiling. A computational application of Nye’s dislocation density tensor via an EBSD-based GND calculation is then used to quantify the effect of GND density on recrystallized grain size. By gaining a better understanding of the mechanism behind this relationship, materials can be designed with a more precise combination of mechanical strength and ductility. Furthermore, it is found that EBSD is advantageous over TEM to characterize dislocations because GND densities can be quantified, as well as distinguished from statistically stored dislocations.