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
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600 MPa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.
高温强度
金属间化合物
Ti-Al-Nb alloy
strength at high temperature
intermetallics
Abstract
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 1 200 K.The data of Ti-42.8Al-14.2Nb alloy and Ti-40Al-20Nb alloy were 1 150 MPa and 950 MPa at room temperature,respectively.The compressive yield strength decreased quickly with increasing temperature above 1 200 K.Ti-42.8Al-14.2Nb alloy had good plasticity and yield strength at high temperatures.
中图分类号 G322.23
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收稿日期 2007/6/15
修改稿日期 2007/9/30
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备注林哲(1982-),男,辽宁本溪人,硕士研究生.
引用该论文: LIN Zhe,TAN Yi,XU Fu-min. High Temperature Mechanical Properties of Ti-Al-Nb Alloys with Different Phase[J]. Materials for mechancial engineering, 2008, 32(4): 58～61
林哲,谭毅,许富民. 不同组成相钛-铝-铌三元合金的高温强度[J]. 机械工程材料, 2008, 32(4): 58～61
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参考文献
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【4】Kim Young-Won.Microstructural evolution and mechanical properties of a forged gamma titanium aluminide alloy[J].Acta Metall Mater,1992,40(6):1121-1134.
【5】Fuchs G E.The effect of processing on the hot workability of Ti-48Al-2Nb-2Cr alloys[J].Metall Mater Trans A,1997,28A:2543-2553.
【6】Chraposki J,Szkliniarz W,Kocielna,et al.A microstructure and chemical composition of phases in Ti-48Al-2Cr-2Nb intermetallic alloy[J].Materials Chemistry and Physics,2003,81(2/3):438-442.
【7】Eylon D,Keller M M,Jones P E.Development of permanent-mold cast TiAl automotive valves[J].Intermetallics,1998,7/8(6):703-708.
【8】Bartolotta P,Barrett J,Kelly T,et al.The use of cast Ti-48Al-2Cr-2Nb in jet engines[J].JOM,1997,49:48-50.
【9】Eckert M,Kath D,Hilpert K.Thermodynamic Activities in the Alloys of the Ti-Al-Nb System[J].Metall Mater Trans A,1999,30A:1315-1326.
【10】张永刚,韩雅芳,陈国良,等.金属间化合物结构材料[M].北京:国防工业出版社,2001.
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