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Microstructure evolution and improved properties of laminated titanium matrix composites with gradient equiaxed grains

查看全文 作　　者：WANG [1]Shuai;HUANG [1,2]LuJun;JIANG [1]Shan;ZHANG [1]Rui;AN [1]Qi;SUN [3]Yuan;GENG [1,2]Lin 高影响力作者 机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;[2]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;[3]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China高影响力机构 出　　处：《Science China(Technological Sciences)》索引2020年第63卷第12期,共11页高影响力期刊 基　　金：This work was supported by the National Key R&D Program of China(Grant No.2017YFB0703100);the Guangdong Province Key Area R&D Program(Grant No.2019B010942001);the National Natural Science Foundation of China(Grant Nos.51822103,51801206 and 51731009);the Fundamental Research Funds for the Central Universities(Grant No.HIT.BRETIV.201902)。 摘　　要：With the purpose of improving both the strength and ductility,gradient equiaxed grains were successfully achieved in the matrix of the laminated TiB/Ti-TiB/Ti-6.58Al-1.76Zr-1.04V-0.89Mo composite via water quenching(WQ) and thermal compressing deformation. Gradient equiaxed grains varied from approximately 1.0 μm in TiB/Ti-6.58Al-1.76Zr-1.04V-0.89Mo layer to 5.5 μm in TiB/Ti layer. The formation of the gradient structure was related to the alloying elements diffusion during the initial sintering process,and the equiaxed shape was constructed by dynamic recrystallization during thermal compressing. WQ treatment before thermal compressing was adopted to obtain fine lamellar structure,which promoted the segmentation of αlamellae,and accelerated the dynamic recrystallization process. Raising the quenching temperature can increase the proportion of equiaxed grains in the composite,which improved both the bending strength and ductility. Compared with the as-sintered specimen,the specimen with gradient equiaxed grains exhibited nearly 30% enhancement in flexural strength(from 1719 to 2218 MPa),and the ultimate bending fracture strain was increased from 7.0% to 17.2%. This significant improvement should be attributed to the coordination deformation by interface gradient grains,the grain refinement strengthening and the good balance between strength and ductility of the recrystallized equiaxed grains. 关 键 词：titanium matrix composites laminated structure gradient equiaxed grains microstructure evolution dynamic recrystallization bending properties
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