Achieving the near-net shaping of brittle and difficult-to-machine materials is still challenging. Thus, we explore a method to prepare Ti-22Al-25Nb alloy by solid-powder hot isostatic pressing (HIP) diffusion bonding. The grain size, microstructure, interface features and mechanical properties of the fabricated alloy were systematically investigated. The results show that the solid-powder interface realizes a complete metallurgical bonding, and the grain size, composition and microstructure in transition zone is formed on the side of preform through recrystallization. There is a huge difference for the grain size between the powder forming zone and the preforming zone. As a result, the fabricated sample for solid-powder transition zone exhibits an excellent mechanical properties, with a tensile strength of 940 MPa, elongation of 2.9% and torsional strength of 815 MPa, respectively. In response to the torsional force, the crack starts from the preforming zone, and the crack deflection and branching occurs in the transition zone, thereby preventing the crack from propagating to the powder forming zone. The torsional strength of the solid powder HIP diffusion bonding zone is basically the same as that of the preformed zone. This study proposes a new solution for fabricating brittle and difficult-to-process materials and is of great significance in the development of the overall near-net shaping technology for complex components of such material.

实现脆性和难加工材料的近净成形仍然具有挑战性。因此，我们探索了一种通过固粉热等静压 (HIP) 扩散结合制备 Ti-22Al-25Nb 合金的方法。系统地研究了所制备合金的晶粒尺寸、显微组织、界面特征和力学性能。结果表明，固-粉界面实现了完全的冶金结合，过渡区的晶粒尺寸、成分和显微组织是通过再结晶在预制件侧面形成的。粉末成形区和预成形区之间的晶粒尺寸存在巨大差异。结果，制备的固-粉过渡区样品表现出优异的力学性能，拉伸强度为940 MPa，伸长率为2。9% 和抗扭强度分别为 815 MPa。响应扭转力，裂纹从预成型区开始，在过渡区发生裂纹偏转和分支，从而阻止裂纹扩展到粉末成型区。固体粉末HIP扩散结合区的抗扭强度与预成型区的抗扭强度基本相同。该研究为脆性难加工材料的制造提出了一种新的解决方案，对此类材料复杂部件整体近净成形技术的发展具有重要意义。从而防止裂纹扩展到粉末形成区。固体粉末HIP扩散结合区的抗扭强度与预成型区的抗扭强度基本相同。该研究为脆性难加工材料的制造提出了一种新的解决方案，对此类材料复杂部件整体近净成形技术的发展具有重要意义。从而防止裂纹扩展到粉末形成区。固体粉末HIP扩散结合区的抗扭强度与预成型区的抗扭强度基本相同。该研究为脆性难加工材料的制造提出了一种新的解决方案，对此类材料复杂部件整体近净成形技术的发展具有重要意义。