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Constructing two-scale network microstructure with nano-Ti5Si3 for superhigh creep resistance

查看全文 作　　者：[1,2]Y.Jiao;[1]L.J.Huang;[3]S.L.Wei;[4]H.X.Peng;[1]Q.An;[1]S.Jiang;[1]L.Geng 高影响力作者 机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001, China;[2]Center of Analysis and Measurement,Harbin Institute of Technology,Harbin 150001, China;[3]Department of Materials Science and Engineering,Massachusetts Institute of Technology,Cambridge, MA02139, USA;[4]Institute for Composites Science Innovation (InCSI),School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027, China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第8期,共11页高影响力期刊 基　　金：financially supported by the National Key R&D Program of China (No. 2017YFB0703100);the National Natural Science Foundation of China (NSFC) under Grant Nos. 51822103, 51671068 and 51731009;the Fundamental Research Funds for the Central Universities (No. HIT.BRETIV.201902) 摘　　要：The improvement of mechanical properties must be achieved by designing and constructing more suitable microstructure,such as hierarchical microstructure.In order to significantly enhance the creep resistance of titanium matrix composites(TMCs),two-scale network microstructure was constructed including the first-scale network(<150μm)with micro-TiB whisker(TiBw)reinforcement and the second-scale network(<30μm)with nano-Ti5Si3 reinforcement by powder metallurgy and in-situ synthesis.The 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 MPa.Moreover,the rupture time of the composite was increased by 20 times,compared with that of the Ti6Al4 Valloy at 550℃/300 MPa.The superior creep resistance could be attributed to the hierarchical microstructure.The 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 sliding.In addition,the nano-Ti5Si3 particle was dissolved,and precipitated with smaller size than the primary Ti5Si3.This phenomenon was attributed to Si element diffusion under high temperature and external stress,which could further continuously enhance the creep resistance.Finally,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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