Abstract Ni3Al-based alloys were successfully bonded via transient liquid phase (TLP) bonding technique with a BNi-2 interlayer. The typical joint consisted of three characteristic zones including: athermal solidification zone (ASZ) composed of Ni3B phase, isothermal solidification zone (ISZ) with dual-phase γ+γ′ structure and diffusion affected zone (DAZ) containing borides precipitation. With the increase of bonding temperature or holding time, the ASZ was gradually replaced by the ISZ, and Ni3B with high hardness disappeared. The shear strength of the joint improved from 391 MPa at 1050 °C for 30 min to 712 MPa at 1100 °C for 120 min, and the fracture occurred in the ISZ. To eliminate the borides precipitation in the DAZ of the as-bonded joints, a post-bond heat treatment (PBHT) process was implemented. The microstructure of the ISZ was homogenized and the hardness distribution across the whole joint was uniform. Therefore, the shear strength of the joint bonded at 1100 °C for 120 min increased to 838 MPa after PBHT at 1150 °C for 540 min.

中文翻译：

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BNi-2夹层Ni3Al基合金TLP接头界面组织演变及力学性能

摘要 Ni3Al 基合金通过瞬态液相（TLP）键合技术与 BNi-2 夹层成功键合。典型的接头由三个特征区组成，包括：由Ni3B相组成的非热凝固区（ASZ）、具有双相γ+γ'结构的等温凝固区（ISZ）和含有硼化物析出的扩散影响区（DAZ）。随着结合温度或保温时间的增加，ASZ逐渐被ISZ取代，高硬度Ni3B消失。接头的剪切强度从 1050 ℃ 30 min 时的 391 MPa 提高到 1100 ℃ 120 min 时的 712 MPa，断裂发生在 ISZ。为了消除结合后接头 DAZ 中的硼化物沉淀，实施了结合后热处理 (PBHT) 工艺。ISZ 的微观结构是均匀的，整个接头的硬度分布是均匀的。因此，在 1150°C 下进行 PBHT 540 分钟后，接头在 1100°C 下粘合 120 分钟的剪切强度增加到 838 MPa。