摘要
The microstructure and properties of Mg ZK21 laser beam weld without filler were researched using optical microscopy (OM),electron microscopy and mechanical test.The results show that the fracture strain of the joints after laser beam welding reduces by about 10.7%at room temperature.By means of laser beam welding,the fusion zones contain tensile RS,while the base material far away from the fusion line is under balancing compressive RS.The microstructures of the weld were characterized by a narrow heat affected zone and twins.Significant {1012} tension twins occur in the weld HAZ during laser welding processing.Due to the influence of temperature field and stress on morphologies,most of twins form twinning bands,which are nearly parallel to the welding direction.
The microstructure and properties of Mg ZK21 laser beam weld without filler were researched using optical microscopy （OM）, electron microscopy and mechanical test. The results show that the fracture strain of the joints after laser beam welding reduces by about 10.7% at room temperature. By means of laser beam welding, the fusion zones contain tensile RS, while the base material far away from the fusion line is under balancing compressive RS. The microstructures of the weld were characterized by a narrow heat affected zone and twins. Significant { 101-2 } tension twins occur in the weld HAZ during laser welding processing. Due to the influence of temperature field and stress on morphologies, most of twins form twinning bands, which are nearly parallel to the welding direction.
出处
《中国有色金属学会会刊：英文版》
CSCD
2008年第A01期81-85,共5页
Transactions of Nonferrous Metals Society of China
关键词
镁合金
焊接法
激光
定位焊接
magnesium alloy
twinning
laser beam welding
microstructure
