Effects of Ti and Si particle sizes on phase transformations of Ti–Si–Cu system were explored through differential thermal analysis (DTA), x-ray diffraction (XRD), and field emission scanning electron microscope (FESEM). For TiSiCu system, fine Ti easily dissolves into Si–Cu liquid to form Ti–Si–Cu liquid at ∼795 °C, which further participates into the reaction of β-Ti and Si to yield abundant quantity of Ti5Si3 at ∼917 °C. For TiSiCu system, nonetheless, the reaction of coarse Ti with Si–Cu liquid involves more difficulty in forming the ternary liquid, which is the causal factor for the delay in the formation of Ti5Si3 to ∼948 °C. For TiSiCu system, coarse Si results in the formation of insufficient Si–Cu liquid initially, whereas Ti–Cu liquid forms at ∼960 °C instead, which further reacts with coarse Si to form Ti–Si–Cu liquid, and then Ti5Si3is precipitated from the liquid.
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This work is supported by The National Natural Science Foundation of China (No. 50671044) and The Foundation of Jilin University for Distinguished Young Scholars. Partial financial support comes from The Graduate Innovation Fund of Jilin University (20111045).
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Lü, SJ., Wang, HY., Yang, ZZ. et al. Analysis of effects of reactant particle size on phase transformations in the Ti–Si–Cu system using differential thermal analysis and x-ray diffraction. Journal of Materials Research 27, 2615–2623 (2012). https://doi.org/10.1557/jmr.2012.196