(School of Materials Science and Engineering, Harbin Institute of Technology,
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DOI:
10.7502/j.issn.1674-3962.2016.09.05
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Abstract:
In order to fill a gap of structural material used at 550-800 oC possessing low density, high temperature durability, high toughness, processing and deformability, and solve bottleneck problem of high brittleness and low strengthening effect of titanium matrix composites (TMCs) fabricated by powder metallurgy, network structured TMCs were successfully and steadily fabricated by low energy milling and hot pressing sintering technologies, based on architecture design and accurate adjustment. The ductility of the network structured TMCs can be increased by 5 times compared with that of the conventional TMCs with a homogenous microstructure. Moreover, the network structured TMCs exhibited higher strengthening effect at room and high temperatures and possessed designable character. The service temperature can be increased by 200oC compared with that of the monolithic alloy. In other words, the network structured TMCs can be used at 550-800 oC to partially replace high-temperature alloy to get weight loss of 40%. Therefore, they possess extensive application potential in aerospace and got much attention. Recent research progress of design and fabrication, deformation and forming, heat treatment modification and control, high temperature property of the network structured TMCs were reviewed. In addition, the solved key problems and the remained problems were also pointed out, and then the further research directions in future are proposed. Combining with the practical application demand, on the one hand, the present material systems, theory and technology should be further optimized for their practical applications to solve urgent demand; on the other hand, new TMCs and modification technology can be exploited by multi-scale hierarchical design and process design in order to further enhance their combination property.