Abstract
TiAl alloys are light-weight structural materials developed for high-temperature applications in the field of aeronautic, aerospace, automobile etc. Single crystal or coarse grain structure is beneficial to the high-temperature performance of metallic materials. We report here a cyclic heat treatment (CHT) method to prepare large-sized grains based on abnormal grain growth (AGG) process for TiAl alloys, through which TiAl grains with a maximum length of 70mm was obtained. It was revealed that the subgrain boundary energy introduced by CHT dominates the driving force during AGG. The dynamic process of high-angle grain boundaries migration behavior of AGG was investigated by electron backscatter diffraction, which revealed that the abnormally grown grains had no orientation deviation during the CHT. We have established a kinetic model of α-phase growth. Our result is of great significance to the development of TiAl alloys, providing possibility to prepare large-sized TiAl single crystals and benefiting the design of light-weight mechanical systems. Furthermore, this CHT method is important theoretical guiding significance for the preparation of single crystals or coarse crystals from other metals or ceramic materials.
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