Abstract
Aluminum powders with different concentrations of TiC ceramic particles were applied to an AZ31B magnesium alloy by laser cladding. Due to differences in coefficients of thermal expansion, the distribution of TiC ceramic particles in the cladding layer was not uniform. The results show that the degree of TiC ceramic particle agglomeration in the cladding layer increases with increasing TiC content. The phases of cladding metal mainly consisted of Al, γ-Al12Mg17, β-Al3Mg2, and TiC. The γ-Al12Mg17 phase mainly distributed to the bottom of the cladding layer, and the β-Al3Mg2 phase distributed to the middle and surface areas. The existence of the γ-Al12Mg17 phase enhanced the hardness of the fusion zone. The microhardness of the cladding layer increased with increasing TiC ceramic particle content. An appropriate TiC content improved the wear resistance of the cladding layer. When the TiC content was excessive, the agglomeration behavior of TiC ceramic particles strongly affected the wear resistance of the coatings.
Highlights
Laser cladding technology can effectively improve the surface properties of magnesium or magnesium alloy, which expands the application scope of magnesium and magnesium alloy in industry [1,2,3].To fabricate a high-quality coating with good metallurgical bonding with the substrate, the cladding layer should have good physical properties that match those of the magnesium alloy substrate [4,5].Aluminum has physical properties similar to those of magnesium alloy, and its corrosion resistance and toughness are excellent, but the hardness and wear resistance are lower [6,7,8]
In the was applied to an Primarily, we studied the morphology and distribution was applied to an AZ31B magnesium alloy
Addition, we found found that when the content of is more than ceramic particles will fall off from the that when the content of TiC is more than 20%, TiC ceramic particles will fall off from the cladding cladding metal, and the formation of the cladding layer is very poor
Summary
Laser cladding technology can effectively improve the surface properties of magnesium or magnesium alloy, which expands the application scope of magnesium and magnesium alloy in industry [1,2,3]. Ceramic particles are usually added into aluminum coating powder to fabricate a ceramic-metal composite cladding layer on the surface of magnesium alloy. The existence of SiC ceramic particles improved the wear resistance of the cladding layer. An Al-based composite coating, with added ceramic particles or synthetic hard phases, can enhance the surface properties magnesium alloy.particles. An Al-based composite coating,ofwith added ceramic or synthetic phases, can such enhance parameters and rare-earth elements, that influence the micro-structure and properties of an. Research on the effect and of the distribution morphology ceramic rare-earth elements, influence the micro-structure properties of anand. Research on the effect of the distribution and morphology of ceramic particles on composite rarely investigated. We studied the morphology and distribution was applied to an AZ31B magnesium alloy. Micro-structure and properties of coatings was analyzed in detail
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