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Evolution of microstructure and high temperature tensile properties of as-extruded Ti Bw reinforced near-α titanium matrix composite subjected to heat treatments

查看全文 作　　者：WANG [1,2]Bo;ZHANG [1]HaoBiao;HUANG [3]LuJun;HE [1]JianLi;ZHANG [1]YouFeng;WANG [1]Wei 高影响力作者 机构地区：[1]School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;[2]Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China;[3]School of Materials Science and Engineering, Harbin Institute of Technology ,Harbin 150001, China高影响力机构 出　　处：《Science China(Technological Sciences)》索引2018年第61卷第9期,共6页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51701114,11604204,51471063,51271111);the Youth Teacher Development Program of Shanghai Universities(Grant No.ZZGCD15101);Scientific Research Project of Shanghai University of Engineering Science;Talents Project of Shanghai University of Engineering Science 摘　　要：The Ti Bw reinforced near-α titanium matrix composite(Ti-5.8 Al-3.4 Zr-4.0 Sn-0.4 Mo-0.4 Nb-0.4 Si-0.06 C) was successfully synthesized by powder metallurgy and hot extrusion route. The effects of solution and aging temperature on the microstructure and high temperature tensile properties of the composite were investigated. The results revealed that the fine transformed β phase can be obtained by the solution treatment at β phase region and aging treatment, no other precipitates were observed. The α2 phase(Ti3 Al) can be acquired when the solution treated at α+β phase region followed by aging treatment. With increasing the aging temperature from 500 to 700°C for 5 h, the size of α2 precipitates increases from about 5 to about 30 nm. The Ti Bw are stable without any interfacial reaction during the heat treatments. The high temperature tensile properties show that the composite performed by solution and aging treatment exhibits good strengthening effects. With increasing the aging temperature from 500 to 700°C, the strength of the composite increases at the expense of elongation due to the increment of α2 precipitates.The strength of the composite at 600°C increases by 17% to 986 MPa after 1000°C/2 h/AC and 700°C/5 h/AC heat treatment. 关 键 词：矩阵合成 加热处理 微观结构 高温度 TI 性质 张力 渗出
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