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首页> 外文期刊>Journal of Materials Science >Interfacial bonding and microstructural evolution of Al in kinetic spraying
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Interfacial bonding and microstructural evolution of Al in kinetic spraying

机译：动力喷涂中Al的界面键合与组织演变

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Bonding and microstructural evolution of Al particles in kinetic spraying (cold gas dynamic spraying) result from ultra-high strain rate plastic deformation during supersonic single and successive collisions of the particles. The coating formation of kinetic spraying is composed of three stages (an individual particle impact + subsequent impacts + isothermal heating during full coating). When a single particle impacts, interfacial shear strain location under adiabatic state produces inter-particle bonding and grain refinement at narrow zone (220 nm) by continuous dynamic recrystallization. After the individual particle impact, successive supersonic in-flight particle impact results in static recovery and static recrystallization at un-refined area using the heat energy converted from the kinetic energy as activation energy. In this study, the bonding state and microstructure of individually impacted Al particle and full Al coating were analyzed using a focused ion beam technique and a transmission electron microscopy. The mechanisms of interfacial bonding and microstructural evolution of Al particle during kinetic spraying were suggested.
机译：在动态喷涂（冷气体动态喷涂）中，Al颗粒的键合和微观结构演变是由颗粒在超声波的单次和连续碰撞过程中超高应变速率塑性变形引起的。动态喷涂的涂层形成包括三个阶段（单个颗粒冲击+后续冲击+全涂层过程中的等温加热）。当单个粒子撞击时，绝热状态下的界面剪切应变位置通过连续动态重结晶在狭窄区域（<220 nm）产生粒子间键合和晶粒细化。在单个粒子撞击之后，连续的超音速飞行中粒子撞击会使用从动能转换的热能作为激活能，在未精炼区域产生静态恢复和静态重结晶。在这项研究中，使用聚焦离子束技术和透射电子显微镜分析了单独撞击的Al颗粒和完整Al涂层的结合状态和微观结构。提出了动态喷涂过程中Al颗粒的界面结合和微观结构演变的机理。

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