不同组成相钛-铝-铌三元合金的高温强度  

High Temperature Mechanical Properties of Ti-Al-Nb Alloys with Different Phase

作　　者：林哲[1] 谭毅[1] 许富民[1] 

机构地区：[1]大连理工大学材料科学与工程学院三束材料改性国家重点实验室,辽宁大连116023

出　　处：《机械工程材料》2008年第4期58-61,65,共5页Materials For Mechanical Engineering

摘　　要：通过调整钛、铝、铌三种元素的含量,制备了分别具有单相、双相和三相组织的三种钛-铝-铌合金;对合金从室温到1 373 K的压缩和拉伸性能进行了试验研究,并用XRD和SEM等手段分析了合金的组织结构和断口形貌。结果表明:单相合金Ti-47.5Al-5Nb在室温下的压缩屈服强度为450 MPa,一直保持到1 200 K;双相合金Ti-42.8Al-14.2Nb和三相合金Ti-40Al-20Nb在室温下的压缩屈服强度分别为1 150 MPa和950 MPa,随着温度的上升,屈服强度略有下降,从1 000 K以后,屈服强度下降的幅度增大;在1 200 K,双相和三相合金的屈服强度仍然保持在600MPa左右;在1 200 K以上三种合金的屈服强度都急剧下降;双相合金在高温下具备很高的塑性和屈服强度。Three kinds of Ti-Al-Nb alloys(single-phase,double-phase and triple-phase)were prepared by changing the contents of Ti,Al and Nb.Compressive and tensile tests were used to investigate the mechanical properties at room temperature to 1 373 K.The characteristics of microstructure and the tensile fracture surface were analyzed and observed kuch with XRD and SEM.The results showed that the compressive yield strength of Ti-47.5Al-5Nb alloy was 450 MPa at room temperature,neraly the same to the yield strength at ...

关 键 词：钛-铝-铌合金 高温强度 金属间化合物 

分 类 号：TG146.23[一般工业技术—材料科学与工程]