Автоматическая сварка, 2019, №10



2019 №10 (01)

DOI of Article 10.15407/as2019.10.02

2019 №10 (03)

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Журнал «Автоматическая сварка», № 10, 2019 г., с. 18-21

Influence of laser power and welding velocity on the microstructure of Zr-based bulk metallic glass welded joints

Haiyan Wanga¹, Ma Yanyib², Zhang Yupenga¹, Dong Chunlina¹, Yi Yaoyonga¹, Xi Huaia¹

¹Guangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangzhou, 510650, China
²School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China

Laser welding is employed to weld Zr_67.8Cu_24.7Al_3.43Ni_4.07 bulk metallic glass, and the effects of laser power and welding velocity on the microstructures of bulk metallic glass joints are studied. Owing to the high speed and high-energy density of laser welding, the weld fusion zones remain amorphous structure. Some nano-grains are formed in weld fusion zones and of benefits for the improvement of microhardness. Crystallization happens in heat-affected zone and deteriorates the hardness of materials. The joint welded with laser power of 600 W and velocity of 110 mm/s exhibits the lowest degree of crystallization. Larger laser power or slower welding speed would cause excessive heat accumulation in heat-affected zone. 10 Ref., 1 Tabl., 3 Fig.
Keywords: Bulk metallic glass; laser welding; microstructure; crystallization

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