MICROSTRUCTURAL FEATURES OF JOINT ZONES IN AN EXPLOSIVE WELDED Al/Ti/STEEL PLATE SYSTEM
Al／Ti／Steel覆板爆炸焊接界面的显微组织特征

The microstructural variations of the bonded zones in an explosive welded Al/Ti/Steel plate system were studied by using electron microscopy techniques.The direct transmission electron microscope(TEM) observation found the transition zones in the bonded zone, and there are obvious interfaces between the transition zones and between transition zone and base metal.In the Al/Ti bonded zone, the transition zone is an Al Ti mixture.In the Ti/Steel bonded zone,the transition zone is composed of the FeTi intermetallic layer and an amorphous layer.The morphology and size of the transition zones depend upon the diffussion of alloy elements and cooling rate during explosive welding.