TiB_(2)p颗粒含量及热处理对自生TiB_(2)p/7075基构型复合材料组织和力学性能的影响  

Effects of TiB_(2)p particle content and heat treatment on microstructure and mechanical properties of in-situ TiB_(2)p/7075-based architecture composites

作　　者：张翼 颜庆华 寇宝弘 王宇[1] 卢德宏[1] ZHANG Yi;YAN Qing-hua;KOU Bao-hong;WANG Yu;LU De-hong(School of Materials and Science Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料与科学工程学院,云南昆明650093

出　　处：《材料热处理学报》2022年第7期19-27,共9页Transactions of Materials and Heat Treatment

基　　金：云南省重大科技专项(202102AB080015)。

摘　　要：采用铸造结合热挤压工艺制备了自生TiB_(2)p/7075基构型复合材料,利用光学显微镜、扫描电镜、布氏硬度计和电子万能试验机等研究了TiB_(2)p含量及热处理对其组织及性能的影响。结果表明:构型复合材料的最优热处理工艺为:480℃固溶1 h+120℃时效12 h。组织中,复合区呈纤维状,沿纵向与基体区依次交替分布。随着TiB_(2)p含量(7 mass%、10 mass%、13 mass%)的增加,构型复合材料的抗拉强度、硬度和伸长率都先增加后降低,在颗粒含量为10 mass%时达到最高值,分别比7075铝合金提高了20.9%、14.1%和13.4%,实现了复合材料强塑性的同时提升;颗粒的分布先趋于均匀后团聚加剧;复合区宽度随颗粒含量增加而增大,复合区与基体区的宽度比值依次增加。In-situ TiB_(2)p/7075-based architecture composites were prepared by casting and hot extrusion.The effects of TiB_(2)particle content and heat treatment on microstructure and properties of the composites were investigated by means of optical microscope,scanning electron microscopy,Brinell hardness tester and electronic universal testing machine.The results show that the optimal heat treatment process of the composites is solution treatment at 480℃for 1 h and aging at 120℃for 12 h.In the microstructure of the composites,the composite area is fibrous,which is alternately distributed with the matrix area along the longitudinal direction.With the increase of TiB_(2)particle content(7 mass%,10 mass%,13 mass%),the tensile strength,hardness and elongation of the composites increase first and then decrease,and when the particle content is 10 mass%,they reach the highest value,which are 20.9%,14.1%and 13.4%higher than that of the 7075 aluminum alloy respectively.Therefore,both the strength and ductility of the composites are improved.The distribution of particles first tends to be uniform and then the agglomeration intensifies.The width of composite zone increases with the increase of particle content,and the width ratio of composite zone to matrix zone increases too.

关 键 词：7075铝基构型复合材料 颗粒含量 热处理 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]