科研之友
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摘要
The tungsten inert gas (TIG) welding-brazing technology using Mg based filler was developed to join AZ31B Mg alloy to TA2 pure Ti in a lap configuration. The results indicate that robust joints can be obtained with welding current in the range of 60-70 A and welding speed of 0.2 m min(-1). The joints were found to be composed of the coarse grained fusion zone accompanied with the precipitated phase of Mg17Al12, and a distributed Mg-Ti solid solution zone at the interface of Mg/Ti, indicating that metallurgical bonding was achieved. The maximum tensile-shear strength of 193.5 N mm(-1), representing 82.3% joint efficiency relative to the Mg alloy base metal, was attained. The optimised Mg/Ti joint fractured at Mg fusion zone upon tensile-shear loading, mainly caused by grain coarsening. Moreover, the fracture surface practically consisted of scraggly areas, which was characterised by equiaxed dimple patterns accompanied with a few lamellar tearing.
- 出版日期2014-7
- 单位重庆大学
