Microstructure evolution in Nd:YAG laser-welded (Zr53Cu30Ni9Al8)Si0.5 bulk metallic glass alloy

Huei Sen Wang, Hou Guang Chen, Jason Shian Ching Jang

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Abstract

To generate a rapid welding thermal cycle for a (Zr53Cu30Ni9Al8)Si0.5 bulk metallic glass (BMG) weld, the Nd:YAG pulse laser welding process with pre-selected welding variables is used in this study. The microstructure development and crystallization behavior in the weld fusion zone (WFZ) and the heat-affected zone (HAZ) are investigated by scanning electron microscopy (SEM), micro-area X-ray diffractometry (XRD) and transmission electron microscopy (TEM). From the results, it is observed that the HAZ is liable to crystallize, although no crystallization occurs within the WFZ. The spherical type crystalline phases (with a particle size of 20-200 nm) observed in the HAZ, which are rich in Zr, Cu and Ni, result in a change of chemical composition in this region. Furthermore, if the particle size in the crystallized area is greater than 50 nm, cracks may form.

Original languageEnglish
Pages (from-to)224-228
Number of pages5
JournalJournal of Alloys and Compounds
Volume495
Issue number1
DOIs
StatePublished - 9 Apr 2010

Keywords

  • (Zr53Cu30Ni9Al8)Si0.5
  • Bulk metallic glass
  • Nd:YAG laser welding

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