首页> 外文会议>Asian Pacific conference for fracture and strength'99 (APCFS'99) >Fracture Behavior of Lamellar Structure in Ti-48Al-2Mn-2Nb Alloy Produced by Centrifugal Spray Deposition
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Fracture Behavior of Lamellar Structure in Ti-48Al-2Mn-2Nb Alloy Produced by Centrifugal Spray Deposition

机译:离心喷涂沉积Ti-48Al-2Mn-2Nb合金层状组织的断裂行为

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摘要

The effects of lamellar structure on deformation and fracture behavior in arnTi-48Al-2Mn-2Nb alloy produced by centrifugal spray deposition(CSD) were investigated. Therndeformation and fracture of samples after tensile and compressive tests were examined in a scanningrnelectron microscope (SEM). The in situ tensile testing was further performed in a SEM and the crackrngrowth path of samples was observed. The result shows that there is a remarkable effect of lamellarrnstructure of CSD TiAl alloy on its deformation and fracture process. Especially, the main crackrnextension is dependent on the lamellar direction with the tensile loading axis. SEM observationsrnindicate that there is a shielding toughening effect of lamellar structure on the fracture in CSDrnsamples, such as, crack deflection, crack path tortuousity, and crack branching, etc. Moreover, crackrngrowth path of sample shows the main crack grows tortuously and uncontinuously by ligamentsrnbridging many microcracks in front of crack tip. The effect mechanism of microstructure on therndeformation and fracture process is discussed.
机译:研究了层状结构对离心喷涂法制备的arnTi-48Al-2Mn-2Nb合金变形和断裂行为的影响。拉伸和压缩试验后,样品的形变和断裂在扫描电子显微镜(SEM)中进行了检查。进一步在SEM中进​​行原位拉伸测试,并观察到样品的裂纹扩展路径。结果表明,CSD TiAl合金的层状结构对其变形和断裂过程具有显着影响。特别是,主要裂纹扩展取决于带拉伸载荷轴的层状方向。 SEM观察表明,层状结构对CSDrn样品的断裂具有屏蔽增韧作用,例如裂纹挠度,裂纹路径曲折和裂纹分支等。此外,样品的裂纹扩展路径表明主裂纹由于韧带桥曲而曲折而不连续地生长。裂纹尖端前面有许多微裂纹。探讨了显微组织对变形和断裂过程的影响机理。

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