Abstract
Important progresses in the study of laser additive manufacturing on metal matrix composites (MMCs) have been made. Recent efforts and advances in additive manufacturing on 5 types of MMCs are presented and reviewed. The main focus is on the material design, the combination of reinforcement and the metal matrix, the synthesis principle during the manufacturing process, and the resulted microstructures as well as properties. Thereafter, the trend of development in future is forecasted, including: Formation mechanism and reinforcement principle of strengthening phase; Material and process design to actively achieve expected performance; Innovative structure design based on the special properties of laser AM MMCs; Simulation, monitoring and optimization in the process of laser AM MMCs.
Highlights
Metal matrix composites (MMCs) are fabricated by continuously dispersing a reinforcing material into a monolithic metallic material matrix [1]
In this paper important recent efforts and advances in the study of laser additive manufacturing (AM) MMCs are reviewed and the main focus is on the material design, the combination of reinforcements and matrix, the synthesis principle during the manufacturing process and the resulted microstructures and properties. 5 types of laser AM MMCs are discussed, and lots of significant research results have been achieved
Many challenges still existed due to the poor compatibility with the reinforcement-matrix interface, contamination of the particle surfaces, and so on. It was difficult for the Aluminum matrix composites (AMCs) prepared by direct additive method to exert the full advantage of the reinforcements, and the property improvement was greatly restricted [26]
Summary
Metal matrix composites (MMCs) are fabricated by continuously dispersing a reinforcing material into a monolithic metallic material matrix [1]. The matrix is usually a lighter metal, such as aluminum and titanium provided a compliant support for the reinforcement. Most common reinforcements used in commercial applications are A l2O3, B4C, BeO, NbC, SiC, TaC, TiB, TiC and WC. The largest volume of the commercially used reinforcement is SiC by a significant margin, which is followed by Al2O3 and TiC [8]. In the laser AM process to fabricate MMCs, the raw materials are either premixed using ball milling machine (option 1) or mixed from powder feeders (option 2). In this paper important recent efforts and advances in the study of laser AM MMCs are reviewed and the main focus is on the material design, the combination of reinforcements and matrix, the synthesis principle during the manufacturing process and the resulted microstructures and properties. Based on these research results, some important developing focuses are proposed for the future work
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