Carbide formation in electric-discharge-sintered Ti3Al compact caused by steric acid in ball-milled Ti and Al powder mixture
| Autor: | Y.H. Kim, Wonmok Lee, C.J. Van Tyne, K.B. Kim, C.H. Jeong, Y. W. Cheon, Si Young Chang, Y. H. Yoon |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Steric effects Materials science Fabrication Process Chemistry and Technology Composite number Sintering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Carbide Compressive strength Chemical engineering 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology Powder mixture Strengthening mechanisms of materials |
| Zdroj: | Ceramics International. 44:19771-19778 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2018.07.233 |
| Popis: | Elemental Ti and Al powders with a composition of Ti-25 at% Al, with and without 2 wt% steric acid as a process control agent, were ball-milled at 1000 rpm for 1 h using a Spex mill/mixer. The prepared powder mixture was then consolidated using an electric discharge sintering (EDS) with a 450 μF capacitor at an input voltage of 1.5–1.7 kV. The ball-milling process did not alter the original phase and composition of the elemental Ti and Al powders regardless of the addition of steric acid. However, the EDS of the ball-milled powder mixture with the steric acid formed nano-scaled Ti 3 AlC 2 particles, which were embedded in the grains of the Ti 3 Al. The resulting compressive yield strength of the Ti 3 Al-Ti 3 AlC 2 composite compact was about 1935 MPa, which is over twice the amount of the EDS compact obtained using the ball-milled powder mixture without the steric acid. In this paper, the fabrication method of the Ti 3 Al-Ti 3 AlC 2 composite compact using an EDS process is reported for the first time, and the formation sequence and the strengthening mechanisms are discussed. |
| Databáze: | OpenAIRE |
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