Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5451726 | Journal of Materials Science & Technology | 2016 | 19 Pages |
Abstract
Ultrasonic vibration with different powers from 0âkW to 1.6âkW was applied during the tungsten inert gas welding-brazing of Mg/Ti. The microstructures, mechanical properties and corrosion resistance of the ultrasonic assisted tungsten inert gas (U-TIG) welded-brazed Mg/Ti joint were characterized. The results showed that, without being subjected to ultrasonic vibration, coarse columnar α-Mg grains occurred in the fusion zone of Mg/Ti joint. However, with ultrasonic power of 1.2âkW, the average grain size of columnar α-Mg grains was refined from 200âµm to about 50âµm and the tensile strength of joints increased ~18% up to 228âMPa. Besides, high fraction of grain boundaries was introduced by grain refinement, contributing to improve the corrosion resistance in two ways: (i) accelerating the formation of Mg(OH)2 protective layer and (ii) reducing the mismatch and disorder between Mg(OH)2 protective layer and Mg alloy surface.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Chemistry
Authors
Chuan Xu, Guangmin Sheng, Xuezhen Cao, Xinjian Yuan,