Correlation between the Microstructure and Mechanical Properties of W-Bearing Ti-6Al-4V Alloys
| Autor: | Godwin Kwame Ahiale, Yong Jun Oh, Young Sam Kwon, In-Seok Kye |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Bearing (mechanical)
Materials science 020502 materials Metallurgy Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention 0205 materials engineering law Modeling and Simulation Powder metallurgy Ti 6al 4v 0210 nano-technology |
| Zdroj: | Korean Journal of Metals and Materials. 59:357-364 |
| ISSN: | 2288-8241 1738-8228 |
| Popis: | W-containing Ti-6Al-4V alloys (W=0, 1, and 5 wt%) were fabricated by the powder injection molding process, and the corresponding effects of tungsten content on the mechanical properties and microstructure of the alloys were investigated. The alloy powders were sintered at 1200 °C and then hot-isostatically-pressed at 900 °C. The fabricated alloys were subjected to microstructural and chemical analyses, and tensile and nano-indentation tests. The yield strength and tensile strength proportionally increased as the W content was increased from 0 wt% to 5 wt%. Ductility was not affected by the addition of up to 5 wt% W due to its complete dissolution in the matrix. Higher W addition induced finer α/β lamellar microstructures and increased the β to α phase ratio. Moreover, the added W dissolved preferentially in the β phase by solid solution hardening, increasing the hardness of the β phase, which originally was significantly softer than the α phase. For the alloys containing up to 5 wt% W, the strengthening without ductility loss was attributed to the finer α/β lamellae and the volume increase in the β phase hardened by W. These results suggest that adding W to Ti-6Al-4V alloy is a promising method for developing Ti alloys with both high strength and toughness. |
| Databáze: | OpenAIRE |
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