IN-SITUSYNTHETICTiB2PARTICULATE REINFORCED METAL MATRIX COMPOSITE COATING ON AA2024 ALUMINUM ALLOY BY LASER CLADDING TECHNOLOGY

Jiang Xu (), Yide Kan and Wenjin Liu
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Jiang Xu: Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, P. R. China;
Yide Kan: Laser Processing Research Center, Mechanical Engineering Department, Tsinghua University, Beijing 10084, P. R. China
Wenjin Liu: Laser Processing Research Center, Mechanical Engineering Department, Tsinghua University, Beijing 10084, P. R. China

Surface Review and Letters (SRL), 2005, vol. 12, issue 04, 561-567

Abstract: In order to improve the wear resistance of aluminum alloy,in-situsynthesizedTiB2andTi3B4peritectic composite particulate reinforced metal matrix composite, formed on a 2024 aluminum alloy by laser cladding with a powder mixture ofFe-coated Boron,TiandAl, was successfully achieved using 3-KW CWCO2laser. The chemical composition, microstructure and phase structure of the composite clad coating were analyzed by energy dispersive X-ray spectroscopy (EDX), SEM, AFM and XRD. The typical microstructure of the composite coating is composed ofTiB2,Ti3B4,Al3Ti,Al3Feandα-Al. The surface hardness of cladding coating increases with the amount of addedFe-coatedBandTipowder which determines the amount ofTiB2andTi3B4peritectic composite particulate. The nanohardness and the elastic modulus at the interface of theTiB2andTi3B4peritectic composite particulate/matrix were investigated using the nanoindentation technique. The results showed that the nanohardness and the reduced elastic modulus from the peritectic composite particulate to the matrix is a gradient distribution.

Keywords: TiB2andTi3B4peritectic composite particulate; in-situsynthesized; laser cladding; nanoindention (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05007438

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