TEM Investigations of Titanium Processed by ECAP Followed by Cold Rolling
| Autor: | Bernhard Mingler, Michael J. Zehetbauer, Hans-Peter Karnthaler, Wolfgang Lacom, Vladimir V. Stolyarov |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Pressing
Materials science Annealing (metallurgy) Mechanical Engineering Metallurgy chemistry.chemical_element Condensed Matter Physics Microstructure chemistry Mechanics of Materials Transmission electron microscopy Ultimate tensile strength General Materials Science Grain boundary Titanium Tensile testing |
| Zdroj: | Materials Science Forum. :805-810 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.503-504.805 |
| Popis: | Conventional coarse grained (CG) commercial pure (CP) Ti Grade 2 was studied after cold rolling (CR) at room temperature, and after equal channel angular pressing (ECAP) at 450° C followed by CR, by transmission electron microscopy (TEM) methods. CR of the CG material leads to a microstructure showing initially twins with (0112) type and later subgrains separated by lowangle grain boundaries. CR carried out after ECAP yields the fragmentation of fine grains (300 – 800 nm) mostly bounded by high-angle boundaries into elongated subgrains (~ 100 nm). It was shown with in-situ annealing experiments in the TEM that this microstructure is thermally stable up to a temperature of 450° C. Tensile tests showed that the combination of ECAP with CR has the potential to produce at the same time high strength (941 MPa) and high ductility (16.7%). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|