烧结温度对SPS制备Ti2AlNb组织与拉伸性能的影响
Influence of Sintering Temperature on the Microstructure and Tensile Properties of Ti2AlNb Prepared by SPS
王恒荣 1姜凤阳 1思芳 1杜予晅 2王俊勃 1刘江南 1刘建江1
作者信息
- 1. 西安工程大学材料工程学院,陕西西安 710048
- 2. 西部超导材料科技股份有限公司,陕西西安 710018
- 折叠
摘要
采用高能球磨和放电等离子烧结技术制备了Ti2AlNb合金,利用SEM、EDS和XRD对合金显微组织及物相结构进行表征,利用万能拉伸试验机测试合金室温抗拉强度,并观察其断口形貌,以此分析不同烧结温度对Ti2AlNb合金组织及拉伸性能的影响.结果表明,不同烧结温度下Ti2AlNb合金均由O相、B2相及α2相组成;O相形态随烧结温度变化而发生改变,在950 ℃烧结时,O相呈Rim-O相形态,1 000 ℃烧结时呈针状O相,1 050 ℃与1 100 ℃烧结时呈板条状O相.在烧结温度1 000 ℃、保温时间90 min以及压强50 MPa的条件下,Ti2AlNb合金的室温抗拉强度可达198 MPa,室温拉伸后的断裂类型是以解理断裂为主的脆性断裂.
Abstract
Ti2AlNb alloy was prepared by high-energy ball milling and spark plasma sintering technology.The microstructure and phase composition of the alloy were characterized by SEM,EDS and XRD,the ten-sile strength of the alloy at room temperature was measured by universal tensile testing machine,and the fracture morphology was observed.The effects of different sintering temperatures on the microstructure and tensile properties of Ti2AlNb alloy were analyzed.The results show that Ti2AlNb alloy is composed of O phase,B2 phase and a2 phase at different sintering temperatures,and the morphology of the O phase changes with the sintering temperature.The O phase appears as Rim-O phase at 950 ℃,acicular O phase at 1 000 ℃,and lath-like O phase at 1 050 ℃ and 1 100 ℃.The tensile strength of Ti2AlNb alloy at room temperature can reach 198 MPa under the conditions of a sintering temperature of 1 000 ℃,a holding time of 90 min and a pressure of 50 MPa,and its fracture type after tensile testing at room temperature is brittle fracture which mainly consists of cleavage fracture.
关键词
Ti2AlNb/SPS/烧结温度/室温拉伸性能Key words
Ti2AlNb/spark plasma sintering/sintering temperature/room temperature tensile property引用本文复制引用
基金项目
陕西省重点研发计划项目(2018GY-110)
西安市重大科技成果转化及产业化项目(20GXSF0010)
出版年
2024
NETL
NSTL
万方数据