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Fracture behavior of notched specimens of TiAl alloys

机译：TiAl合金缺口试样的断裂行为

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摘要

Fracture behavior of a two-phase TiAl alloy was investigated using notched specimens. Fracture surfaces and metallographic sections of surviving notch in double notched specimens are observed. The fracture process of notched specimens of TiAl alloys was described as that several inter-lamellar cracks initiate and extend directly from the notch root and propagate preferentially along the interfaces between lamellae and stop at various obstacles. With increasing applied load, cracks connect with each other and propagate further by translamellar cracks. The toughening mechanisms, which make the main crack difficult to propagate or cause it to be stopped, could be reducing the driving force for crack propagation. The higher toughness of near fully lamellar microstructure than that of finer duplex microstructure is attributed to the path of crack propagation. On the fracture surfaces of the finer duplex microstructure, more low-energy-spending interlamellar fracture facets are observed, which means that it is easier for crack to bypass a fine duplex lamellar grain with lamellae perpendicular to the main crack and to take a interlamellar path.
机译：使用带缺口的样品研究了两相TiAl合金的断裂行为。观察到双缺口试样中尚存缺口的断裂表面和金相截面。 TiAl合金带缺口试样的断裂过程被描述为：多个片间裂纹直接从缺口根部开始并延伸，并优先沿片层之间的界面扩展，并在各种障碍处停止。随着施加载荷的增加，裂纹相互连接并通过跨层裂纹进一步扩展。使主要裂纹难以扩展或导致其停止的增韧机制可能会降低裂纹扩展的驱动力。接近完全层状的显微组织比更精细的双相显微组织具有更高的韧性归因于裂纹扩展的路径。在较细的双相组织的断裂表面上，观察到了更多的低能量消耗的层间断裂面，这意味着裂纹更容易绕过垂直于主裂纹的层状细小双相层状晶粒并采取层间路径。

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  • 来源
    《Journal of Materials Science》 |2007年第8期|2820-2829|共10页
  • 作者

    J. H. Chen; R. Cao; J. Zhang; G. Z. Wang;

  • 作者单位

    State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology Lanzhou Gansu 730050 China;

    State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology Lanzhou Gansu 730050 China;

    High Temperature Material Research Division Central Iron and Steel Research Institute Beijing 100081 China;

    State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology Lanzhou Gansu 730050 China;

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