|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Multiscale Architectured Materials (MAM II): Tailoring Mechanical Incompatibility for Superior Properties
||Novel Contributions to Deformation and Properties in Gradient Materials
||Shan "Cecelia" Cao, Christian Roach, Yuntian Zhu,
|On-Site Speaker (Planned)
||Shan "Cecelia" Cao
Metallic alloys with gradient microstructures have recently been shown to exhibit enhanced mechanical properties, namely increased strength with minimal loss in tensile ductility. One of the most common ways of engineering a gradient microstructure is via surface mechanical attrition treatment (SMAT) wherein hard balls are ultrasonically accelerated to impinge the surface and cause severe deformation and microstructural refinement. The improved properties are based on a number of proposed mechanisms, including dislocation cascading and mechanical incompatibility between layers, however less studied factors include the contributions of residual stress, texture, hardness and sample/process geometry. In this lecture, we will present research vignettes on each of these factors, and deliberate on their overall roles in property enhancement. The results will be used to explain seemingly incongruent phenomena observed in many reports, and further unravel and decouple deformation mechanisms in gradient materials.