Microstructure evolution in Nd:YAG laser-welded (Zr(53)Cu(30)Ni(9)Al(8))Si(0.5) bulk metallic glass alloy

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50119

Title:	Microstructure evolution in Nd:YAG laser-welded (Zr(53)Cu(30)Ni(9)Al(8))Si(0.5) bulk metallic glass alloy
Authors:	Wang,HS;Chen,HG;Jang,JSC
Contributors:	機械工程學系
Keywords:	PHASE
Date:	2010
Issue Date:	2012-03-27 17:03:51 (UTC+8)
Publisher:	國立中央大學
Abstract:	To generate a rapid welding thermal cycle for a (Zr(53)Cu(30)Ni(9)Al(8))Si(0.5) 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. (C) 2010 Elsevier B.V. All rights reserved.
Relation:	JOURNAL OF ALLOYS AND COMPOUNDS
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

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