摘要
全片层TiAl合金的片层取向和片层间距对其断裂韧性、屈服强度、蠕变性能和疲劳性能等力学性能具有重要影响。本文从片层取向控制和片层间距控制两方面,系统的综述了全片层TiAl合金的性能和组织间的关系,并总结了提升全片层TiAl合金的性能的手段。指出取向与晶体生长方向相同、片层间距细小的全片层TiAl合金具有最优的综合力学性能;减小Al当量、增大生长速度和环境压力可减小全片层TiAl合金的片层间距,增大Al当量是最简单有效的细化片层的手段;自引晶法是控制片层取向的新兴方法,是未来TiAl合金片层取向控制的重要发展方向。
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.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2015年第5期90-98,共9页
Journal of Aeronautical Materials
关键词
全片层TiAl合金
片层取向
片层间距
力学性能
full lamellar TiAl alloy
lamellar orientation
lamellar spacing
mechanical properties
