SiCp/Al复合材料直流脉冲点焊核心组织及断裂行为研究

Investigation on Metallography and Fracture Behavior of SiCp/Al Metal Matrix Composite Welding Spot Obtained by DC Pulse Process.

本文对SiC_p/Al金属基复合材料直流脉冲点焊的焊点核心组织进行了研究,主要对焊核SiC颗粒的再分布及其对焊点剪切撕裂行为的影响进行了较深入的探讨。结果表明,SiC_p/Al在采用直流脉冲点焊进行焊接时,焊点核心中的SiC颗粒在电磁搅拌力作用下,向椭圆形核心长轴方向的边界聚集,造成分布不均,致使焊点在剪切撕裂断裂时,断裂发生在富SiC颗粒区与贫SiC颗粒或无SiC颗粒区的交界,以及SiC颗粒数量较少的区域。

This paper describes the results of metallography,especially the SiC particles redistribution,and fracture behavior of welding spot obtained by DC pulse process.Resulted from magnetic force stirring,the SiC particles redistribution at the spot is not uniform.Many particles gather on long axis direction boundary of oval nucleus of welding spot.This induces tear fracture occuring at the borders of rich SiC particle region and poor or no SiC particle region.