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Tensile properties and fracture behavior of Ti_2AlNb based alloys at room temperature 被引量:6
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作者 PENG Ji hua(彭继华) 1, 2 , MAO Yong(毛 勇) 2, LI Shi qiong(李世琼) 2, SUN Xun fang(孙训方) 2 1. Department of Engineering Mechanics, Southwest Jiaotong University, Chengdu 610031, P.R.China 2. Division of Super Alloys, Central Iron and S 《中国有色金属学会会刊:英文版》 CSCD 2000年第3期378-381,共4页
The tensile mechanical properties and fracture behaviors of Ti 22Al 20Nb 7Ta alloys were studied at room temperature. Three typical microstructures of Ti 2AlNb based alloys were obtained by combination of thermal mech... The tensile mechanical properties and fracture behaviors of Ti 22Al 20Nb 7Ta alloys were studied at room temperature. Three typical microstructures of Ti 2AlNb based alloys were obtained by combination of thermal mechanical processing and heat treat ment. They are: 1) lath mixture of O + B 2 with remaining β grain boundaries and α 2 phase; 2) equiaxed O phase in B 2 matrix; 3) fine lath mixture of O + B 2 without remaining β grain boundaries. It is shown that the microstructure obviously affects the tensile properties of Ti 2AlNb based alloys. The microstructure of fine lath mixture of O + B 2 without remaining β grain boundaries has good combination of yield stress and ductility, while the microstructure with lath mixture of O + B 2 with remaining β grain boundaries and α 2 phase has low yield stress and elongation. The fracture mode was also controlled by the microstructure of Ti 2AlNb based alloys. By means of SEM, it was found that the dominated fracture mode of microstructure with lath mixture of O + B 2 with remained β grain boundary and α 2 phase was intergranular, and the fracture mode of the other two microstructures was mainly transgranular. 展开更多
关键词 ti 2AlNb based alloyS TENSILE properties FRACTURE behavior
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Vacuum Brazing of TiAl Based Alloy with 40Cr Steel
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作者 周昀 薛小怀 +1 位作者 吴鲁海 楼松年 《Journal of Shanghai Jiaotong university(Science)》 EI 2004年第2期55-57,共3页
The vacuum brazing of TiAl based alloy with 40Cr steel was investigated using Ag-Cu-Ti filler metal. The experimental results show that the Ag, Cu, Ti atoms in the filler metal and the base metal inter-diffuse toward ... The vacuum brazing of TiAl based alloy with 40Cr steel was investigated using Ag-Cu-Ti filler metal. The experimental results show that the Ag, Cu, Ti atoms in the filler metal and the base metal inter-diffuse toward each other during brazing and react at the interface to form an inter-metallic AlCu 2Ti compound which joins two parts to produce a brazing joint with higher strength. 展开更多
关键词 tiAl based alloy 40Cr steel Ag-Cu-ti filler metal intermetallic AlCu 2ti
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Ti-2Al-2.5Zr合金在300℃碱性水中氧化的表面分析 被引量:5
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作者 封向东 祖小涛 +5 位作者 王治国 向霞 牟云峰 邱绍宇 李燕伶 黄新泉 《材料工程》 EI CAS CSCD 北大核心 2003年第1期17-18,37,共3页
利用原位 AES深度分析 ,XRD,和 XPS方法研究了 Ti- 2 Al- 2 .5 Zr合金在 30 0℃碱性水中氧化 130 0 0 h所形成的氧化膜的结构、成分和价态 ,及其随深度的变化。结果表明 ,氧化膜是由板钛型 Ti O2 、Al2 Ti O5(Ti O2 ·Al2 O3) ,Ti3O... 利用原位 AES深度分析 ,XRD,和 XPS方法研究了 Ti- 2 Al- 2 .5 Zr合金在 30 0℃碱性水中氧化 130 0 0 h所形成的氧化膜的结构、成分和价态 ,及其随深度的变化。结果表明 ,氧化膜是由板钛型 Ti O2 、Al2 Ti O5(Ti O2 ·Al2 O3) ,Ti3O5,Ti2 O3和 Ti O所组成 ,氧化膜由表面到基体基本是按以上顺序交迭构成。通过 XPS和原位 AES分析发现钛合金表面形成由 Ti O2 ,Al2 Ti O5(Ti O2 ·Al2 O3) ,Ti3O5组成的较为稳定的厚约 80 0 nm的 Ti4 + (Ti O2 )层 ,随深度的增加出现了 Ti3+ (Ti3O5,Ti2 O3)和 Ti2 + (Ti O) ,直至基体 ,氧化膜总厚度约 30 0 0 nm。 展开更多
关键词 ti-2AL-2.5ZR合金 碱性水 表面分析 中温氧化 原位AES分析 XPS分析 钛合金
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Oxidation behavior of a novel multi-element alloyed Ti2AlNbbased alloy in temperature range of 650-850℃ 被引量:4
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作者 Yong-Sheng He Rui Hu +2 位作者 Wen-Zhong Luo Tao He Xiang-Hong Liu 《Rare Metals》 SCIE EI CAS CSCD 2018年第10期838-845,共8页
The oxidation behavior of a novel multi-element alloyed Ti2A1Nb-based alloy (Ti-22Al-25Nb-1Mo-1V-1Zr-0.2Si) was studied in the temperature range of 650-850℃. X-ray diffraction (XRD) and scanning electron microsco... The oxidation behavior of a novel multi-element alloyed Ti2A1Nb-based alloy (Ti-22Al-25Nb-1Mo-1V-1Zr-0.2Si) was studied in the temperature range of 650-850℃. X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with an energy-dispersive spectroscopy (EDS) were used to identify the phase constituents and microstructure of the scales formed on the specimens after oxidation at different temperatures. Isothermal oxidation tests show that the oxidation rate of the alloyed TiEAlNb-based alloy is obviously reduced at all temperatures, and the mass gains are very low for this alloy in comparison with those of Ti-22Al-25Nb alloy. The alloying elements Mo, V, Zr and Si have an obvious affect on the oxidation products of the alloys. The improved oxidation resistance for the alloy is ascribed to the introduction of Mo, V, Zr and Si elements, which are beneficial to the selective oxidation of Al to form protective oxides while are disadvantage of the formation of poor oxidation resistance oxides such as AlNbO4. 展开更多
关键词 Oxidation resistance Oxide scale ti2alnb- based alloy alloyING
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Effect of Cooling Rate on Microstructure of Alloy Ti_3Al-10Nb-3V-1Mo
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作者 张启海 周光爵 邬彦如 《Rare Metals》 SCIE EI CAS CSCD 1997年第4期48-53,共6页
The microstructure of alloy Ti 3Al 10Nb 3V 1Mo after heated at 1170℃ for 1 h and cooled to room temperature at different rates was investigated by TEM. The result showed that W.Q. microstructure consisted of sing... The microstructure of alloy Ti 3Al 10Nb 3V 1Mo after heated at 1170℃ for 1 h and cooled to room temperature at different rates was investigated by TEM. The result showed that W.Q. microstructure consisted of single B2 phase, A.C. microstructure consisted of B2 phase matrix and second phase in some regions of the B2 phase crystal grains, and C.C. and F.C. microstructure appeared as a Widmannstatten structure consisting of coarse α 2 phase plates and β phase stripes between the plates. With the decreasing of colling rate, the tension strength was obviously decreased and the plasticity was slightly increased at room temperature. 展开更多
关键词 ti 3Al base alloy Cooling rate B2 phase α 2 phase Tension property Mechanical property
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Effect of Ti-Hf-Zr-Cu-Ni high entropy alloy addition on laser beam welded joint of Ti2AlNb based intermetallic alloy
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作者 Mirza Zahid Hussain Jiangtao Xiong +4 位作者 Jinglong Li Farah Siddique Lin Jie Zhang Yajie Du Xian Rong Zhou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第25期214-226,共13页
TiAlNb based intermetallic alloys,a potential competitor for next-generation super alloys,are susceptible to high-temperature embrittlement due to nucleation of a metastable single B2 phase in the fusion zone(FZ)durin... TiAlNb based intermetallic alloys,a potential competitor for next-generation super alloys,are susceptible to high-temperature embrittlement due to nucleation of a metastable single B2 phase in the fusion zone(FZ)during laser beam welding(LBW).In this study,a high entropy alloy(HEA),Ti-Hf-Zr-Cu-Ni,was self-developed and introduced as an interlayer into laser beam welded joint(LBWJ)of Ti-22 Al-27 Nb to analyze its impact on the evolution of microstructure in the weld zone(WZ)and subsequently on joint performance.Microstructural examination was carried out through electron probe micro analysis(EPMA),electron backscattered diffraction(EBSD)analysis,high-resolution scanning transmission electron microscopy(HRSTEM)comprising bright field(BF),selective area electron diffraction(SAED)and high angle annular dark-field(HAADF)imaging.Addition of the HEA into FZ of LBWJ triggered heterogenous nucleation during solidification,resultantly,fine-grained B2 with a greater proportion of high angle grain boundaries(HAGBs)was developed.FZ of Ti-22 Al-27 Nb LBWJ,prepared with an interlayer of HEA,was composed of planar,cellular,columnar and equiaxed dendritic grains;a solidification mode which was different from that observed in LBWJ prepared without adulteration of the HEA.The impact of heterogenous nucleation during epitaxial solidification on mechanical properties was established through micro vickers hardness mapping and tensile test,conducted at room temperature.The average hardness,343.5 HV,in the FZ of LBWJ prepared with an interlayer of HEA,was compatible with that of base material(BM),345 HV.The ultimate tensile strength(UTS),1062 MPa,and percentage elongation,11.2%,of the HEA tempered LBWJ were found in close approximation with that of BM,1060 MPa and 13.4%,respectively.A ductile mode of failure was observed during tensile test of the Ti-Hf-Zr-Cu-Ni supplemented LBWJ of Ti-22 Al-27 Nb,while quasi-cleavage mode of fracture was apparent in the joint of Ti-22 Al-27 Nb welded without addition of the HEA. 展开更多
关键词 Laser beam welding ti2Al Nb based intermetallics High entropy alloy Heterogenous nucleation
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固溶温度与轧制温度对Ti_3Al基合金的组织与性能的影响 被引量:1
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作者 许剑伟 黄旭 曹京霞 《稀有金属》 EI CAS CSCD 北大核心 2004年第1期50-53,共4页
研究了轧制温度对一种Ti3Al基合金轧棒的拉伸、蠕变、持久和金相组织的影响以及固溶温度对该合金室温拉伸性能、金相组的影响。结果表明 :在两相区轧制时 ,低温轧制的室温综合性能较好 ,但是高温轧制的 65 0℃的综合性能较好 ;随着固溶... 研究了轧制温度对一种Ti3Al基合金轧棒的拉伸、蠕变、持久和金相组织的影响以及固溶温度对该合金室温拉伸性能、金相组的影响。结果表明 :在两相区轧制时 ,低温轧制的室温综合性能较好 ,但是高温轧制的 65 0℃的综合性能较好 ;随着固溶温度的升高 ,该合金的强度升高 。 展开更多
关键词 ti3AL基合金 拉伸性能 蠕变性能 塑性 Α2 固溶温度
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冷却速度对Ti_3Al-10Nb-3V-1Mo合金组织的影响
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作者 张启海 周光爵 邬彦如 《稀有金属》 EI CAS CSCD 北大核心 1998年第2期99-102,共4页
用透射电镜研究了Ti3Al10Nb3V1Mo合金在1170℃加热1h,以不同速度冷却后的显微组织结构。结果表明,W.Q.(水淬)组织由单一B2相组成,A.C.(空冷)组织由B2相基体组成,B2相晶粒内开始了第二... 用透射电镜研究了Ti3Al10Nb3V1Mo合金在1170℃加热1h,以不同速度冷却后的显微组织结构。结果表明,W.Q.(水淬)组织由单一B2相组成,A.C.(空冷)组织由B2相基体组成,B2相晶粒内开始了第二相的析出。C.C.(控冷)和F.C.(炉冷)组织主要是由α2片组成的魏氏组织。随冷却速度降低,合金强度明显降低,塑性略有提高。 展开更多
关键词 ti3AL 冷却速度 B2 Α2 拉伸性能 钛合金
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Ti_3Al基合金微结构及相变的研究 被引量:2
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作者 董林 张彩碚 +2 位作者 李义尧 孙伟 赵志江 《材料科学与工艺》 EI CAS CSCD 1999年第3期73-76,共4页
利用X 射线衍射和透射电子显微镜分析研究了3 种不同Nb 量的锻态Ti3 Al 基合金的组织结构,实验结果表明,含r(Nb) 量为10 % 的合金中,其显微组织由α2 相,O 相和B2 相组成,含r(Nb)量为14 % 的合金量... 利用X 射线衍射和透射电子显微镜分析研究了3 种不同Nb 量的锻态Ti3 Al 基合金的组织结构,实验结果表明,含r(Nb) 量为10 % 的合金中,其显微组织由α2 相,O 相和B2 相组成,含r(Nb)量为14 % 的合金量微组织为O相和B2 相,而含Nb 量为17 % 的合金中显微组织主要为B2 相,其余少量为O 量. 选区电子衍射分析结果表明O 相和B2 相,α2 相和B2 相以及O 相和α2 相之间均存在特定的晶体学取向关系,由此推断合金中含Nb 量为10 % 时,O 相由α2 相转变而来,当合金中含r(Nb) 量达到及超过14% 时,O相直接由B2 相转变而来. 展开更多
关键词 ti3AL基合金 O相 Α2 B2 微结构 相变
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