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Constructing two-scale network microstructure with nano-ti5si3 for superhigh creep resistance

Journal of Materials Science & Technology 2019年第8期35卷 1532-1542页

作者： Y.Jiao L.J.Huang S.L.Wei H.X.Peng Q.An S.Jiang L.Geng State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001 China Center of Analysis and Measurement Harbin Institute of TechnologyHarbin 150001 China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridge MA02139 USA Institute for Composites Science Innovation (InCsi) School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027 China

The improvement of mechanical properties must be achieved by designing and constructing more suitable microstructure,such as hierarchical *** order to significantly enhance the creep resistance of titanium matrix composites(TMCs),two-scale network microstructure was constructed including the first-scale network(50μm)with micro-tiB whisker(tiBw)reinforcement and the second-scale network(30μm)with nano-ti5si3 reinforcement by powder metallurgy and in-situ *** results showed that the creep rate of the composite was remarkably reduced by an order of magnitude compared with the ti6Al4V alloy at 550℃,600℃,650℃ under the stresses between 100 MPa and 350 ***,the rupture time of the composite was increased by 20 times,compared with that of the ti6Al4 Valloy at 550℃/300 *** superior creep resistance could be attributed to the hierarchical *** micro-tiBw reinforcement in the first-scale network boundary contributed to creep resistance primarily by blocking grain boundary sliding,while the nano-ti5si3 particle in the second-scale network boundary mainly by hindering phase boundary *** addition,the nano-ti5si3 particle was dissolved,and precipitated with smaller size than the primary *** phenomenon was attributed to si element diffusion under high temperature and external stress,which could further continuously enhance the creep ***,the creep rate during steady-state stage was significantly decreased,which manifested superior creep resistance of the composite.

关键词： titanium matrix composite Two-scale network microstructure nano-ti5si3 Creep Powder metallurgy

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