Pure aluminum deformed in torsion (shear) at elevated temperatures reaches
a broad "peak" stress and then undergoes about a 17% decrease in flow stress with
deformation to roughly 1-2 equivalent uniaxial strain. Beyond this strain the flow
stress is approximately constant. The sources for this softening are unclear. The
suggested basis includes texture softening, microstructural softening, and enhanced
dynamic recovery. Experiments were performed where specimens were deformed
in torsion to various strains within the softening regime followed by compression
tests at ambient and elevated temperature. Analysis of the compressive yield
strengths indicate that the softening is at least substantially explained by a decrease
in the average Taylor factor due to the development of texture. / Graduation date: 2002
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/29562 |
| Date | 02 May 2002 |
| Creators | Alhajeri, Saleh N. |
| Contributors | Kassner, Michael E. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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