|About this Abstract
||Materials Science & Technology 2012
||Symposium on the Fatigue of Materials II: Advances and Emergences in Understanding
||Fatigue of Copper Consisting of Parallel Columns of Highly Aligned Nanotwins
||Xiaoxu Huang, Chuanshi Hong, Carla Shute, Koichi Tsuchiya, Andrea Hodge, Julia Weertman
|On-Site Speaker (Planned)
Highly nanotwinned microstructures have been shown to have a number of favorable properties: high strength, reasonable ductility, and, unlike nanometals with 3D grains, good structural stability under deformation. The present experiments test the microstructural stability under stress of high purity Cu specimens containing parallel columns of highly aligned nanotwins separated by coherent sigma 3 boundaries. Tension-tension fatigue in the low cycle regime leads to detwinned regions at the surface which become crack initiation sites. Shear strain cycling by HPT transforms the columns of twins into columns of large grains. However careful TEM observation of apparently detwinned regions reveals that the twins are more persistent under stress/strain than was originally apparent.
||Definite: A combination print-CD volume