采用热等静压加工工艺制备了W/Al复合材料,采用超声C扫描(UTC-Scanning)无损检测技术和扫描电镜(SEM)研究了热等静压态材料与经过挤压、锻造变形加工工艺后的复合材料的微观组织结构.首先,利用C扫描对材料内部存在的偏聚组织进行定位,然后利用SEM对样品进行解剖观察分析.二者的实验结果表明,C扫描技术能够实现对W/Al复合材料内部偏聚组织的精确定位.研究表明热等静压态材料组织结构整体上较为均匀,但会在局部有主要成分为基体合金2024 Al的团簇状偏聚组织存在;挤压变形加工有利于均匀化W/Al复合材料,减少团簇状偏聚组织,但在材料内部出现沿挤压方向分布的条带状组织结构;锻造加工能够基本上消除材料中存在的团簇状偏聚组织结构,并减小条带状组织的宽度,使W/Al复合材料的组织结构更加均匀.
W/Al composite materials were prepared by hot isostatic pressing technology.Ultrasonic C-scanning (UTC-Scanning) nondestructive testing technique and scanning electron microscope (SEM) were used to investigate the microstructure of the as-prepared W/Al composites materials by hot isostatic pressing,or after extruding and forging deformation processing.Firstly,the uniform microstructure was located by C-scanning,and then the uniform microstructure was anatomized by SEM.The results of both showed that uniform microstructure of W/Al composite could be located accurately by ultrasonic C-scanning technology.Testing results showed that the as-prepared W/Al composite materials prepared by hot isostatic pressing (HIP) exhibited uniform microstructure,but there were some segregation structure existed in local areas;extrusion was helpful to uniform composite materials,which helped to reduce segregation part;meanwhile,after that some band structures occurred and were parallel to the direction of extrusion;forging process could basically eliminate segregation structure and decrease the width of band structure in composite materials,making composite material a uniform structure.
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