Plasticity In High Temperature Materials: Tantalum and Monazite
Abstract
The mechanical response materials under extreme conditions is of fundamental interest both for the fabrication of components for high-performance systems as well as the reliability of components once they are deployed in service. Dislocation-mediated plastic deformation is one of the most industrially significant deformation mechanisms yet a predictive and experimentally-validated understanding of plastic deformation in materials remains elusive due to the multiple length and time scales over which various phenomena occur. Traditionally scientists and engineers take either a top-down or a bottom-up approach across the length scales, but a significant gap remains in our understanding of how the smaller length scale phenomena interact with the larger length scale phenomena across the mesoscale on the order of micrometers. In this study, the PI developed a multiple length scale experimental program that spans from a 20 nanometer to a 3 micrometer spatial resolution, thus bridging the mesoscale. For face-centered cubic nickel, the methodology uncovered a scaling relationship between the dislocation mean free path length and GND density. For body-centered cubic tantalum, the methodology demonstrates a similar relationship.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 12, 2014
- Accession Number
- ADA598381
Entities
People
- Jeffrey W Kysar
Organizations
- Columbia University