Research status of lamellar orientation and lamellar spacing control of full lamellar TiAl alloy

Lamellar orientation and lamellar spacing have important influence on the mechanical properties of the full lamellar TiAl alloy. In this paper, the relationship between mechanical properties and microstructures of full lamellar TiAl alloy has been systemically reviewed from the aspect of the controlling of lamellar orientation and lamellar spacing. The analysis shows that fine lamellar with single orientation can lead to the best mechanical performance. Alloying, large growth speed and environmental pressure is benefit for fine lamellar, and alloying is the simplest method. Self-seeding technique is one the most promising method to control the lamellar orientation in the future.