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Microstructure and mechanical properties of Cu/SiC metal matrix composite fabricated via friction stir processing
Highlights Designing a net hole was effective to achieve uniform distribution SiC particles and prevent agglomeration of them. SZ has fine and equiaxed grains and distribution of SiC particles in the matrix is almost uniform. No intermetallic compound was formed after FSP. In comparison to pure Cu, Cu/SiC composite shows higher hardness and better wear behavior.
Abstract In the present investigation, pure Cu sheets were reinforced with 25μm SiC particles to fabricate a composite surface layer by friction stir processing (FSP). In order to improve distribution of reinforcing SiC particles, a net of holes were designed by drill on the surface of pure Cu sheet. For evaluation of microstructure, Optical Microscope (OM) and Scanning Electron Microscope (SEM) were used. Microstructural observation confirmed fine and equiaxed grains in the stir zone (SZ) and showed that SiC particles act as heterogeneous nucleation sites in the dynamic recrystallization of Cu grains. Moreover, agglomeration of particles was not observed and fine particles had a good distribution in SZ. In the SEM micrographs, porosities were detected as microstructure defects. Microhardness measurements showed that surface hardness was two times as high as that of substrate. The rotational wear tests demonstrated that use of SiC particles enhanced wear resistance and increased average friction coefficient of pure Cu. No intermetallic compound was found in Cu/SiC composite as revealed by XRD analysis.
Microstructure and mechanical properties of Cu/SiC metal matrix composite fabricated via friction stir processing
Highlights Designing a net hole was effective to achieve uniform distribution SiC particles and prevent agglomeration of them. SZ has fine and equiaxed grains and distribution of SiC particles in the matrix is almost uniform. No intermetallic compound was formed after FSP. In comparison to pure Cu, Cu/SiC composite shows higher hardness and better wear behavior.
Abstract In the present investigation, pure Cu sheets were reinforced with 25μm SiC particles to fabricate a composite surface layer by friction stir processing (FSP). In order to improve distribution of reinforcing SiC particles, a net of holes were designed by drill on the surface of pure Cu sheet. For evaluation of microstructure, Optical Microscope (OM) and Scanning Electron Microscope (SEM) were used. Microstructural observation confirmed fine and equiaxed grains in the stir zone (SZ) and showed that SiC particles act as heterogeneous nucleation sites in the dynamic recrystallization of Cu grains. Moreover, agglomeration of particles was not observed and fine particles had a good distribution in SZ. In the SEM micrographs, porosities were detected as microstructure defects. Microhardness measurements showed that surface hardness was two times as high as that of substrate. The rotational wear tests demonstrated that use of SiC particles enhanced wear resistance and increased average friction coefficient of pure Cu. No intermetallic compound was found in Cu/SiC composite as revealed by XRD analysis.
Microstructure and mechanical properties of Cu/SiC metal matrix composite fabricated via friction stir processing
Akramifard, H.R. (author) / Shamanian, M. (author) / Sabbaghian, M. (author) / Esmailzadeh, M. (author)
2013-08-31
7 pages
Article (Journal)
Electronic Resource
English
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