Mechanism of non-isothermal reaction between elemental powders Ti and Al

来源期刊：中国有色金属学报(英文版)2000年第1期

论文作者：刘咏 黄伯云 贺跃辉

文章页码：29 - 33

Key words：TiAl-based alloy; reaction mechanism; kinetic activation energy

Abstract: The mechanism of the reaction between elemental Ti and Al powders in continuous heating was studied through DSC and XRD phase analyses. Results show that, only one exothermic peak appeared on DSC curves for blended elemental Ti and Al powder compacts; and the onset temperature increased with increasing heating rate. After heating to 1 200℃, the main phases of the heating products were Ti₃Al and TiAl phases. By kinetic calculation, the apparent activation energy for the exothermic reaction was determined as 340±20kJ/mol. Based on these results, it is suggested that the reaction between elemental Ti and Al powders be a complex one. During this reaction, TiAl₃ is formed first, finally Ti₃Al and TiAl. The rate and intensity of the reaction are inherently dependent on the composition and morphology of raw materials, as well as the heating rate.