Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 484, Issue 1-2, Pages 698-701Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.05.019
Keywords
Bulk metallic glass; Crystallization start line; Laser; Finite-element analysis
Categories
Funding
- Material Science and Engineering Center of Jiangxi Province [ZX 200401004]
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An effective method of obtaining the crystallization start (CS) line for bulk metallic glass (BMG) at a high heating and cooling rate, by which the required welding parameters can be estimated intuitively, has been studied. A fixed laser spot heat source, which can heat and cool BMG at a high rate, was used to re-melt Zr48Cu45Al7 BMG. The analysis of crystallization characteristics in the heat-affected zone (HAZ) indicated that at the boundary between the HAZ and the parent alloy there exist a critical state between crystalline and amorphous. The CS line should be tangent with the thermal cycle at the boundary, and the tangential point is most likely to be the transition location of the heating and cooling section in the thermal cycle. Based on simulated thermal cycles at the boundaries with different re-melting conditions by the finite-element method, the CS line for Zr48Cu45Al7 BMG at a high heating and cooling rate was constructed. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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