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首页> 外文期刊>Journal of Materials Engineering and Performance >Current-Assisted Diffusion Bonding of Extruded Ti-22Al-25Nb Alloy by Spark Plasma Sintering: Interfacial Microstructure and Mechanical Properties
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Current-Assisted Diffusion Bonding of Extruded Ti-22Al-25Nb Alloy by Spark Plasma Sintering: Interfacial Microstructure and Mechanical Properties

机译：通过火花等离子体烧结挤出的Ti-22al-25NB合金的电流辅助扩散键合：界面微观结构和机械性能

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摘要

Spark plasma sintering (SPS) technology was used to current-assisted bond extruded Ti-22Al-25Nb alloy. The effects of bonding temperature (920-980?°C) and bonding time (10-30?min) on the microstructure evolution and shear strength of this alloy were investigated systematically. The temperature distribution in the specimen during the current-assisted bonding process was also analyzed by numerical simulation. It is noted that the highest temperature was obtained at the bonding interface. As the bonding temperature and bonding time increased, the voids in the interface shrank increasingly until they vanished. A complete metallurgical bonding interface could be produced at 960?°C/20?min/10?MPa, exhibiting the highest shear strength of 269.3?MPa. In addition, the shear strength of the bonded specimen depended on its interfacial microstructure. With increased bonding temperature, the fracture mode transformed from the intergranular fracture at the bonding interface to the cleavage fracture in the substrate.
机译：火花等离子体烧结（SPS）技术用于电流辅助粘合挤出的Ti-22Al-25NB合金。系统地研究了粘合温度（920-980℃）和粘合时间（10-30≤min）对该合金的微观结构演化和剪切强度的影响。通过数值模拟分析了在电流辅助粘合过程中试样中的温度分布。应注意，在粘合界面中获得最高温度。随着键合温度和键合时间的增加，界面中的空隙越来越萎缩，直到它们消失。完整的冶金粘合界面可以在960？℃/ 20？min / 10？MPa下产生，表现出269.3℃的最高剪切强度。另外，粘合试样的剪切强度依赖于其界面微观结构。随着粘合温度的增加，裂缝模式从粘接界面处的晶间骨折转化为基材中的切割骨折。

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