摘要
采用高能球磨和放电等离子烧结技术制备了Ti_(2)AlNb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Ti_(2)AlNb合金组织及拉伸性能的影响。结果表明,不同烧结温度下Ti_(2)AlNb合金均由O相、B2相及α_(2)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,Ti_(2)AlNb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。
Ti_(2AlNb) 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 tensile 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 Ti_(2AlNb) alloy were analyzed.The results show that Ti_(2AlNb) alloy is composed of O phase,B2 phase and α_(2) 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 Ti_(2AlNb) 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.
作者
王恒荣
姜凤阳
思芳
杜予晅
王俊勃
刘江南
刘建江
WANG Heng-rong;JIANG Feng-yang;SI Fang;DU Yu-xuan;WANG Jun-bo;LIU Jiang-nan;LIU Jian-jiang(School of Materials Engineering,Xi′an Polytechnic University,Xi′an 710048,China;Xi′an Super Crystal Technology Co.,LTD.,Xi′an 710018,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2024年第3期60-65,共6页
Rare Metals and Cemented Carbides
基金
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)。
关键词
Ti_(2)AlNb
SPS
烧结温度
室温拉伸性能
Ti_(2)AlNb
spark plasmasintering
sintering temperature
room temperature tensile property
作者简介
通信作者:姜凤阳(1986-),男,博士,讲师,主要研究方向为金属材料成形,E-mail:jfy_123@126.com。
