IN-SITU SYNTHETIC TiB2 PARTICULATE REINFORCED METAL MATRIX COMPOSITE COATING ON AA2024 ALUMINUM ALLOY BY LASER CLADDING TECHNOLOGY

2005 ◽  
Vol 12 (04) ◽  
pp. 561-567 ◽  
Author(s):  
JIANG XU ◽  
YIDE KAN ◽  
WENJIN LIU
Keyword(s):  
Aluminum Alloy ◽  
Elastic Modulus ◽  
Metal Matrix Composite ◽  
Composite Coating ◽  
Matrix Composite ◽  
Laser Cladding ◽  
Metal Matrix ◽  
Surface Hardness ◽  
Particulate Reinforced

In order to improve the wear resistance of aluminum alloy, in-situ synthesized TiB 2 and Ti 3 B 4 peritectic composite particulate reinforced metal matrix composite, formed on a 2024 aluminum alloy by laser cladding with a powder mixture of Fe -coated Boron, Ti and Al , was successfully achieved using 3-KW CW CO 2 laser. 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 of TiB 2, Ti 3 B 4, Al 3 Ti , Al 3 Fe and α- Al . The surface hardness of cladding coating increases with the amount of added Fe -coated B and Ti powder which determines the amount of TiB 2 and Ti 3 B 4 peritectic composite particulate. The nanohardness and the elastic modulus at the interface of the TiB 2 and Ti 3 B 4 peritectic 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.

Online assessment of TiC decomposition in laser cladding of metal matrix composite coating

2017 ◽  
Vol 121 ◽  
pp. 310-320 ◽  
Author(s):  
Gopinath Muvvala ◽  
Debapriya Patra Karmakar ◽  
Ashish Kumar Nath
Keyword(s):  
Metal Matrix Composite ◽  
Composite Coating ◽  
Matrix Composite ◽  
Laser Cladding ◽  
Metal Matrix ◽  
Online Assessment

In-Situ Synthesis of Metal Matrix Composite Coating with Laser Melting-Solidifying Processes

2006 ◽  
Vol 313 ◽  
pp. 139-144 ◽  
Author(s):  
Lin Geng ◽  
Qing Wu Meng ◽  
Yan Bin Chen
Keyword(s):  
Metal Matrix Composite ◽  
Composite Coating ◽  
Matrix Composite ◽  
Metal Matrix ◽  
High Energy ◽  
Hexagonal Prism ◽  
Laser Melting ◽  
Dendrite Morphology ◽  
Melting Pool

In order to improve wear resistance of titanium alloy, with pre-placed B4C and NiCrBSi powders on Ti-6Al-4V substrate, a process of laser melting-solidifying metal matrix composite coating was studied. The coating was examined using XRD, SEM and EDS. A good metal matrix composite coating was obtained in a proper laser process. There is a metallurgical interface bonding between the coating and the substrate. During laser melting-solidifying process, high energy of laser melted the pre-placed powders and a part of Ti-6Al-4V substrate, which made Ti extend into a melting pool. A reaction between Ti and B4C took place in the melting pool, which in-situ synthesized TiB2 and TiC reinforcements in the coating. The composite coating mainly consists of γ-Ni matrix, TiB2, TiC and CrB reinforcements. Microstructure of the reinforcements obtained using the laser melting-solidifying is not as same as that of reinforcements obtained using general producing methods. Due to high cooling rate of the melting pool, TiC nucleated primarily and grew up in dendrite morphology from undercooled liquid. Encircling TiC, TiB2 precipitated later and grew up in hexagonal prism morphology. TiC and TiB2 formed an inlaid microstructure.

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