Production of fine-grained foils by large strain extrusion-machining of textured Ti–6Al–4V
| Autor: | Balkrishna C. Rao, H. Murthy, Karthik Palaniappan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
020502 materials Mechanical Engineering Alloy 02 engineering and technology Fixture engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Shear (sheet metal) 0205 materials engineering Machining Mechanics of Materials Microscopy engineering General Materials Science Extrusion Texture (crystalline) Composite material 0210 nano-technology |
| Zdroj: | Journal of Materials Research. 33:108-120 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2017.445 |
| Popis: | The large strain extrusion-machining process has been used to refine the microstructure in a Titanium alloy (Ti–6Al–4V). The unconstrained cutting or machining of Ti–6Al–4V entails the formation of shear localized chips at nearly all cutting speeds, thereby hindering the use of extrusion-machining to produce fine-grained materials. The present effort attempts to suppress shear localization by the suitable modification of texture in Ti–6Al–4V through the cold-rolling process prior to extrusion-machining. Ti–6Al–4V plates were cold rolled to 30, 40, 45, and 47% thickness reductions. These textured plates were extrusion machined using a suitably designed fixture leading to fine-grained continuous foils with increased hardness. Microscopy has revealed that the suppression of shear localization in the foils produced from plates which are cold rolled to more than 40% of thickness reduction is triggered by texture formation. For thickness reductions slightly lower than 40% (e.g., 30%), suppression can be achieved only by a combination of texture and extrusion. |
| Databáze: | OpenAIRE |
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