Abstract The high-temperature (1300–1600 K) kinetics for the Ti-Si reactive system were investigated using electro-thermal analysis. The influence of short-term (1–3 min) high-energy ball milling (HEBM) of Ti+0.6Si heterogeneous powder mixtures on the kinetic parameters was also studied. It was shown that HEBM leads to a significant decrease of the apparent activation energy (Ea) of the solid-state reaction between silicon and titanium. For the non-milled mixture, Ea is 339 ± 63 kJ/mol, while after 3 min of HEBM it drops more than twice to 148 ± 12 kJ/mol. The reaction initiation temperature also decreases with an increase of HEBM time: from 1467 ± 62 K for the pristine mixture to 1110 ± 42 K after 3 min of mechanical treatment. The conclusion was made that a decrease of crystalline size and an increase of the crystal lattice defect concentration, which in combination enhance the grain boundary diffusion, can be responsible for the high reactivity of the mechanically activated mixtures.

中文翻译：

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高能球磨对Ti-Si系非均相反应动力学的影响

摘要 使用电热分析法研究了 Ti-Si 反应体系的高温 (1300–1600 K) 动力学。还研究了短期（1-3 分钟）高能球磨 (HEBM) Ti+0.6Si 异质粉末混合物对动力学参数的影响。结果表明，HEBM 导致硅和钛之间固态反应的表观活化能 (Ea) 显着降低。对于未研磨的混合物，Ea 为 339 ± 63 kJ/mol，而在 HEBM 3 分钟后，它下降了两倍以上，达到 148 ± 12 kJ/mol。反应起始温度也随着 HEBM 时间的增加而降低：从原始混合物的 1467 ± 62 K 到机械处理 3 分钟后的 1110 ± 42 K。得出的结论是，晶体尺寸的减小和晶格缺陷浓度的增加，