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Research Status of Lamellar Orientation and Lamellar Spacing Control of Full Lamellar TiAl Alloy
Author(s): 
Pages: 90-98
Year: Issue:  5
Journal: Journal of Aeronautical Materials

Keyword:  full lamellar TiAl alloylamellar orientationlamellar spacingmechanical properties;
Abstract: 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.
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