Influence of Al addition on the products of self-propagating high-temperature synthesis of Al–Ti–Si system
Influence of Al addition on the products of self-propagating high-temperature synthesis of Al–Ti–Si system
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DOI：
10.1016/j.matchemphys.2008.10.024
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发表时间：
2009-04
影响因子：
4.6
通讯作者：
M. Zha;Hong Wang;Shujia Li;Shi-lin Li;Q. Guan;Q. Jiang
中科院分区：
文献类型：
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作者：
M. Zha;Hong Wang;Shujia Li;Shi-lin Li;Q. Guan;Q. Jiang
Influence of Al addition on the products of self-propagating high-temperature synthesis (SHS) reaction in Al–Ti–Si system is investigated. When Al content is 0wt.%, the product only consists of Ti5Si3. When the Al addition is varied over the range of 5–15wt.%, the TiAl3phase appears along with the Ti5Si3phase. Besides Ti5Si3and TiAl3, the transient phase Ti5Si4is also detected in the final products when Al content increases over the range of 20–40wt.%. However, both the Ti5Si3and Ti5Si4phases disappear completely when Al content further increases to 50wt.%; only TiAl3phase and trace of Al exist in the final products. Moreover, increase in Al content causes a decrease in Ti5Si3and an increase in TiAl3amount, which indicates that Al not only serves as a diluent but also participates in the SHS reaction process. Furthermore, the solubility of Si in TiAl3increases significantly with Al addition increasing, while that of Al in Ti5Si3mainly depends on the Al content in the Al–Ti–Si system. In addition, the Al incorporation has a great effect on the microstructure formation and evolution of the SHS reaction products. When Al content is less than 15wt.%, the final product mainly consists of Ti5Si3; however, which changes into Ti5(Si,Al)3as Al content increases to 20–25wt.%, and then turns into another solid solution Ti(Al,Si)3when Al content further increases to 30–50wt.%. Consequently, the microstructure evolution may be summarized as follows: Ti5Si3→Ti5(Si,Al)3→Ti(Al,Si)3.
