A study of combustion synthesis of Ti-Al intermetallic compounds |
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Authors: | W. Y. Yang G. C. Weatherly |
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Affiliation: | (1) Department of Materials Science and Engineering, McMaster University, L8S 4L7 Hamilton, Ontario, Canada |
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Abstract: | The mechanisms involved in the combustion synthesis of Ti-Al intermetallics have been studied by quenching partially transformed pellets to suppress the reaction prior to its completion. The reaction steps leading to the formation of TiAl3, TiAl or Ti3Al were found to be similar in all three compositions used for the study. In each case the initial product detected by X-ray diffraction was TiAl3, while substantial dissolution of Ti into molten Al was found. At the same time the molten Al-Ti liquid adsorbed oxygen, and on quenching the partially transformed pellet, a glass was formed from the liquid. If the combustion synthesis process was completed, the oxygen-rich liquid decomposed, yielding a mixture of oxides and intermetallic compounds. |
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