Synthesis of high-strength W-Ta ultrarine-grain composites
| Title | Synthesis of high-strength W-Ta ultrarine-grain composites |
| Publication Type | Journal Article |
| Year of Publication | 2008 |
| Authors | Ott RT, Yang XY, Guyer DE, Chauhan S, Sordelet DJ |
| Journal Title | Journal of Materials Research |
| Volume | 23 |
| Pages | 133-139 |
| Date Published | Jan |
| Type of Article | Article |
| ISBN Number | 0884-2914 |
| Accession Number | ISI:000252291200019 |
| Keywords | behavior, COMPRESSION, deformation, diffraction, LOCALIZATION, mechanical-properties, microstructure, NANOCRYSTALLINE, POWDER, TUNGSTEN |
| Abstract | Bulk samples of an ultrafine-grained tungsten-tantalum composite alloy have been synthesized by consolidating mechanically milled composite powders. The grain growth during densification is limited due to the submicron-scale layering of the individual metals in the composite particles and the relatively low sintering temperature (1300 degrees C). The ultrafine microstructure of the high-density (similar to 99% theoretical density) samples leads to a high yield stress of similar to 3 GPa under quasi-static uniaxial compression. A tendency for Ta-rich solid-solution formation during densification was observed, and the high-temperature phase equilibria in the composite powders were examined further using high-energy x-ray diffraction at temperatures up to 1300 degrees C. |
| DOI | 10.1557/jmr.2008.0007 |
| Alternate Journal | J. Mater. Res. |
