Evolution of microstructure in laser deposited Al–11.28%Si alloy

Laser melting of Al–Si alloys has been investigated extensively, however, little work on the microstructural evolution of laser deposited Al–Si alloys has been reported to date. This paper presents a detailed microstructural investigation of laser deposited Al–11.28Si alloy. Laser aided direct metal...

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Bibliographic Details
Published in:Surface & coatings technology 2012-01, Vol.206 (8), p.2152-2160
Main Authors: Dinda, G.P., Dasgupta, A.K., Mazumder, J.
Format: Article
Language:English
Subjects:
Accumulation
Aluminum
Aluminum base alloys
Al–Si alloys
Applied sciences
Coatings
Cross-disciplinary physics: materials science
rheology
Deposition
DMD
EBSD
Evolution
Exact sciences and technology
Intermetallic compounds
Laser deposition
Lasers
Materials science
Metals. Metallurgy
Microstructure
Morphology
Physics
Production techniques
Surface treatment
Surface treatments
X-ray diffraction
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Summary:Laser melting of Al–Si alloys has been investigated extensively, however, little work on the microstructural evolution of laser deposited Al–Si alloys has been reported to date. This paper presents a detailed microstructural investigation of laser deposited Al–11.28Si alloy. Laser aided direct metal deposition (DMD) process has been used to build up solid thin wall samples using Al 4047 prealloyed powder. The evolution of macro- and microstructures of laser deposited Al–Si samples was investigated using X-ray diffraction, optical microscopy, scanning electron microscopy and electron backscattered diffraction techniques. Microstructural observation revealed that the morphology and the length scale of the microstructures are different at different locations of the sample. A periodic transition of microstructural morphology from columnar dendrite to microcellular structure was observed in each layer. The observed difference in the microstructure was correlated with the thermal history of the deposit. ► This paper presents microstructural evolution in eutectic Al–Si alloy. ► Microstructural morphology varies with the location of the deposit. ► Microstructural anisotropy was correlated with the thermal history of the deposit. ► Microstructure of the deposit can be controlled by appropriate deposition pattern.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2011.09.051