在大气环境中,对Mg-Zn-Al钎料进行超声振动作用下的铺展,超声时间分别为1,2,3,4s,并与钎剂作用下的钎料铺展行为进行对比.采用体视显微镜观察钎料在超声及钎剂作用下的铺展形貌.采用光学显微镜观察钎料铺展初始端、铺展末端及铺展后钎料的微观组织形貌.结果表明:超声振动作用下的Mg-Zn-Al钎料沿基体表面作受迫铺展,声空化作用于液态钎料产生的冲击波可以破碎基体表面的氧化膜,使液态钎料与母材发生润湿,母材溶解的深度仅有0.12mm.超声时间为2s时,钎料铺展面积最大.超声声空化作用破碎液态钎料在凝固期间产生的α-Mg固溶相及Mg-Zn共晶相,使铺展后的钎料显微组织得到细化.
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