| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
MS&T'11 Poster Session
|
| Presentation Title |
207 Site-Specific Texture Analysis of High Pressure Torsion Processed BCC Metals Using Synchrotron Radiation |
| Author(s) |
Jonathan Ligda, Brian Schuster, Ruslan Valiev, Zenji Horita, Qiuming Wei |
| On-Site Speaker (Planned) |
Jonathan Ligda |
| Abstract Scope |
Through high pressure torsion (HPT), metal grain size can reach into the nanocrystalline regime, below 100 nm, resulting in very high strengths. However, this method creates a grain size gradient due to the variation in the induced strain with radial position. Grains are smaller further from the disk center. Recent results also suggest changes in the deformation mode. Site-specific microcompression of nanocrystalline Ta shows switching from homogenous deformation to localized plastic flow at the disk edge. To understand why this switch occurs, synchrotron x-rays are utilized for site-specific texture analysis at multiple locations on the HPT disk to map out any texture changes with position. Tests are performed at Argonne National Lab’s Advanced Photon Source on six different bcc metals in two different orientations. Preliminary results show evidence of torsion fibres for bcc metals, {110}<uvw> and {hkl}<111>, also the (110) pole figures show very different textures between the orientations. |
| Proceedings Inclusion? |
Undecided |