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Characterizing Micromechanical Properties of Friction Welding Interface between TiAl Alloy and GH3039 Superalloy

机译：TiAl合金与GH3039高温合金摩擦焊接界面的微观力学性能。

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摘要

To explore the macro-fracture mechanism of a friction welded joint between TiAl alloy and GH3039 superalloy, the micromechanical properties of intermediate phases at the joint interface are characterized and the relationship between the macro-fracture and micro-fracture of the joint is established. The indentation technique has been employed to calculate the nano-hardness and fracture toughness of the intermediate phases. The dynamic in-situ tensile test in SEM has been applied to observe the initiation and propagation process of cracks at the interface. It has been found that Al NiTi and AlNi Ti have the highest nano-hardness and elastic recovery rates, while TiAl and GH3039 base metals have the lowest nano-hardness and elastic recovery rates. This indicates that the harder the materials, the more prone they are to elastic deformation. Nevertheless, the fracture toughness of Al NiTi and AlNi Ti are the two lowest, which were 1.7 MPa·m and 2.7 MPa·m , respectively. The cracks sprouted from Al NiTi and AlNi Ti and then spread throughout the entire intermediate phase zone. In other words, the fracture mainly happened in these two phase layers. It has been concluded that Al NiTi and AlNi Ti were the two weakest phases at the interface and their poor fracture toughness results in low joint strength.
机译：为探讨TiAl合金与GH3039高温合金摩擦焊接接头的宏观断裂机理，表征了接头界面中间相的微观力学性能，建立了接头宏观断裂与微观断裂之间的关系。压痕技术已被用于计算中间相的纳米硬度和断裂韧性。 SEM中的动态原位拉伸试验已用于观察界面裂纹的萌生和扩展过程。已经发现Al NiTi和AlNi Ti具有最高的纳米硬度和弹性回复率，而TiAl和GH3039贱金属具有最低的纳米硬度和弹性回复率。这表明材料越硬，它们越容易发生弹性变形。然而，Al NiTi和AlNi Ti的断裂韧性是最低的两个，分别为1.7 MPa·m和2.7 MPa·m。裂纹从Al NiTi和AlNi Ti萌芽，然后扩展到整个中间相区域。换句话说，断裂主要发生在这两个相层中。已经得出结论，Al NiTi和AlNi Ti是界面处的两个最弱相，它们的差的断裂韧性导致较低的接头强度。

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