Combination of a Nd:YAG laser and a liquid cooling device to (Zr53Cu30Ni9Al8)Si0.5 bulk metallic glass welding

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 1; pp. 338 - 341
• Main Authors: WANG, H. S, CHEN, H. G, JANG, J. S. C, CHIOU, M. S
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier 25.11.2010
• Subjects: Applied sciences; Crystallization; Devices; Exact sciences and technology; Heat affected zone; Joining, thermal cutting: metallurgical aspects; Laser beam welding; Liquid cooling; Liquid crystal displays; Metals. Metallurgy; Welding; Zirconium; Temperature distribution; Vickers hardness; Cooling rate; Crystallization; Experimental device; SAED; Al; Laser welding; Bulk metallic glass; Metallic glasses; Precipitation; Cu; Transmission electron microscopy; Laser pulse; Transition metal alloy; Si; Cooling system; Heat affected zone; Zt; Welding parameter; Ni; Zirconium base alloys
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.09.014

a- A liquid cooling device (LCD) helps to produce a lower initial welding temperature. a- A lower initial welding temperature leads to a faster welding thermal cycle (WTC). a- A faster WTC produces a crystallization free weld for a laser welded Zr-based BMG. Using pre-selected welding parameters, a crystallization-free weld for (Zr53Cu30Ni9Al8)Si0.5 bulk metallic glass (BMG) was successfully produced by adopting a Nd:YAG pulse laser in combination with a liquid cooling device (LCD). When a LCD was employed, a faster cooling rate and shorter retention time for the crystallization temperature interval were produced, thus, no crystallization was observed in the weld fusion zone (WFZ) or heat affected zone (HAZ). The hardness in those areas did not differ significantly in comparison to the parent material (PM). For the room temperature laser weld (LCD was not employed), HAZ crystallization seemed unavoidable, although no crystallization occurred within the WFZ. The major crystalline phase in the HAZ was identified as Zr2Cu. When the precipitates were greater in the crystallized area (i.e., HAZ), cracks were more likely to form, thus, hardness in the area was decreased.