采用SEM和XRD分析热处理后合金试样的显微组织及相组成,用TEM分析原始组织中钇的存在方式。结果表明,钇在原始组织中以Y2O3形式存在;钇增加O相衍射峰,提高Ti-23Al-25Nb合金压缩性能,如抗压强度、压缩率等,钇的强化作用是由于Y2O3第二相粒子强化和钇细化晶粒的晶界强化共同作用的结果。
Abstract
Microstructures and phase compositions of Ti-23Al-25Nb alloy after different heat treatment were analyzed by SEM and XRD.The form of element of Y in original structure was analyzed by TEM.The results show that the element of Y is in the form of Y2O3.Being as the addition of element of Y,diffraction peaks of O-phase increase,and the compression properties of Ti-23Al-25Nb alloy such as compression strength and compressibility increase.Strengthening effect of Y is the result of combined action of dispersion strengthening of Y2O3 and grain boundary strengthening of Y.
关键词
Ti-23Al-25Nb合金 /
钇 /
显微组织 /
压缩性能
{{custom_keyword}} /
Key words
Ti-23Al-25Nb alloy /
Y /
microstructure /
compression property
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
GOGIA A K,NANDY T K,BANERJEE D,et al.Microstructure and mechanical properties of orthorhombic alloys in the Ti-Al-Nb system[J].Intermetallics,1998,6(7-8):741-748.
CHU F,MITCHELL T E,MAJUMDAR B,et al.Elastic properties of the O phase in Ti-Al-Nb alloys[J].Intermetallics,1997,5(2):147-156.
REN X,HAGIWARA M.Displacive precursor phenomena in Ti-22Al-27Nb intermetallic compound to diffusional transformation[J].Acta Mater,2001,(49):3971-3980.
FENG T,NAKAZAWA S,HAGIWARA M.Creep behavior of tungsten-modified orthorhombic Ti-22Al-22Nb-2W alloy[J].Scripta Mater,2000(43):1065-1070.
BOEHLERT C J.The effects of forging and rolling on microstructure in O+BCC Ti-Al-Nb alloys[J].Materials Science and Engineering,2000,A297:118-129.
吴波,沈剑韵,张翥,等.Ti2AlNb基合金的计算机模拟研究进展[J].稀有金属材料与工程,2002,31(4):241-245.
毛勇,李世琼,张建伟,等.Ti-22Al-20Nb-7Ta合金的显微组织和力学性能研究[J].金属学报,2000,36(2):135-140.
EMURA S,ARAOKA A,HAGIWARA M,et al.B2 Grain size refinement of (O+B2) Ti-22Al-27Nb Alloy[A].Ti-2003 Science and Technology.Proceedings of the 10th World Conference on Titanium[C].,2004.2153-2159.
杜挺.稀土元素在金属材料中的一些物理化学[J].金属学报,1997,33(1):69-77.
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,2001.789-797.
GERMANN L,BANERJEE D,GUEDOU J Y,et al.Microstructure-property relationships in newly developed multiphase Ti2AlNb-based titanium aluminides[A].Ti-2003 Science and Technology.Proceedings of the 10 th World Conference on Titanium[C].2004,4:2137-2144.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
国家自然科学基金资助项目(50274035)
{{custom_fund}}