Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23314
Title: Microstructure of laser melted Zn-Al-based alloy
Authors: Zhu, YH
Man, HC 
Lee, WB 
Keywords: Cooling rate
Laser melting
Microstructure
Phase transformation
Solidification
Zn-Al alloy
Issue Date: 2003
Publisher: Elsevier
Source: Journal of materials processing technology, 2003, v. 139, no. 1-3 SPEC, p. 296-301 How to cite?
Journal: Journal of materials processing technology 
Abstract: The microstructure of a laser treated eutectoid Zn-Al-based alloy (Zn-22% Al-2% Cu, in wt.%) has been investigated using X-ray diffraction (XRD), back-scattered scanning electron microscopy (BSEM) techniques. The alloy specimen was previously furnace cooled, then treated by continuous laser scanning. Various microstructures were observed in the laser treated alloy specimen. The molten zone is composed mainly of a fine dendritic structure of zinc-rich βs′-phase. In the intermediate region between the molten zone and the bulk part of the specimen, a typical dendritic structure of cast eutectoid alloy is formed, i.e. an aluminum-rich αs′-phase as the core of the dendrites, surrounded by βs′-phase. Zinc-rich η- and ε-phases form in the inter-dendritic region. These were distinct from the lamellar structure in the bulk part of the specimen. The effect of laser scan speed on the microstructure and phase transformation of various metastable phases in the alloy is also discussed.
URI: http://hdl.handle.net/10397/23314
ISSN: 0924-0136
EISSN: 1873-4774
DOI: 10.1016/S0924-0136(03)00239-5
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