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Solidified microstructure of SiCp/Al composites bonds under ultrasonic vibration and their fracture characteristics
Author(s): 
Pages: 63-72
Year: Issue:  1
Journal: The Chinese Journal of Nonferrous Metals

Keyword:  aluminum metal matrix compositesbondmicrostructurefracture behaviorin-situ observation;
Abstract: 研究超声波作用下SiCp/Al复合材料焊缝的微观组织特征,并采用SEM对室温下焊缝的原位拉伸断裂特性过程及断口形貌进行观察分析.结果表明,在焊接不同阶段经超声波处理,可有效地控制焊缝的微观组织.在拉伸应力作用下所有焊缝在没有观察到明显裂纹生成之前瞬间发生断裂,呈现脆性断裂的特征.当焊缝中无 SiC颗粒时,焊缝中发达的Zn-Al共晶相为焊缝的薄弱相,是裂纹萌生的部位,且是裂纹扩展的主要路径.当母材中的SiC颗粒迁移到焊缝中时,主要聚集于共晶相中,SiC颗粒和共晶组织的结合界面是微裂纹萌生的部位,裂纹主要沿着共晶组织扩展,在强大的脆性断裂惯性作用下,扩展路径上较多的先共晶相β(Zn)发生解理断裂,先共晶相α(Al)具有明显的抗裂作用.
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