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Microstructural Features of TiAl_3 Base Compounds Formed by Reaction Synthesis

机译:反应合成形成的TiAl_3基化合物的微观结构特征

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Microstructural evolution in TiAl_3 and TiAl_3 base alloys formed by the reaction synthesis between liquid Al and solid Ti or Ti alloys has been studied by carrying out the tests on reaction couples isothermally reacted between 973 and 1 373 K for different time intervals. It has been found that the reaction product forms by the exothermic chemical reaction and while TiAl_3 is the only reaction product formed up to the reaction temperature of 1 273 K, TiAl_3 as well as Ti_9Al_(23) form when the reaction is carried out at 1 373 K. In all cases the microstructure of the reaction layer comprises titanium aluminide particles dispersed in an Al rich matrix. However, morphological features of titanium aluminide particles been shown to be widely differing with the reaction conditions. In pure Ti-Al reaction couples an increase in the reaction temperature from 973 to 1 173K leads to the formation of particles having a bi-modal distribution. At the reaction temperature of 1 173 K a large number of particles formed contain several micro-cracks. In contrast to TiAl_3 formed in the case of pure Ti-Al couples, the morphology of the TiAl_3 based compounds containing V or Mo, Zr and Si has been found to be significantly different. Instead of being equiaxed, the particles of TiAl_3 based compounds have a continuously changing morphology across the reaction layer. The particles away from the reaction interface, in general, are not equiaxed, and have sharp edges and many of them have severe internal micro-cracks.
机译:通过对973和1373 K在不同时间间隔内等温反应的反应对进行了测试,研究了由液态Al与固态Ti或Ti合金之间的反应合成形成的TiAl_3和TiAl_3基合金的组织演变。已经发现,反应产物是通过放热化学反应形成的,而TiAl_3是直到1273 K的反应温度形成的唯一反应产物,而TiAl_3以及Ti_9Al_(23)的生成是在反应温度为1时进行的。 373K。在所有情况下,反应层的微观结构均包含分散在富Al基体中的铝化钛颗粒。然而,显示出铝化钛颗粒的形态特征随反应条件而大不相同。在纯Ti-Al反应中,反应温度从973升高到1173K,导致形成具有双峰分布的颗粒。在1173 K的反应温度下,形成的大量颗粒包含多个微裂纹。与在纯Ti-Al对的情况下形成的TiAl_3相反,发现包含V或Mo,Zr和Si的TiAl_3基化合物的形态显着不同。基于TiAl_3的化合物的颗粒不是等轴的,而是在反应层上具有连续变化的形态。通常,远离反应界面的颗粒不是等轴的,并且具有锋利的边缘,并且其中许多具有严重的内部微裂纹。

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