γ-TiAl合金的显微组织对其蠕变性能的影响

林建国; 张永刚; 陈昌麒

γ-TiAl合金的显微组织对其蠕变性能的影响

北京航空航天大学材料科学与工程系

详细信息

中图分类号: TG 113.255
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出版历程
- 收稿日期: 1998-07-02
- 网络出版日期: 1998-06-30

Effects of the Microstructure of γ-TiAl Alloys on the Creep Behavior

Beijing University of Aeronautics and Astronautics,Dept. of Materials Science and Engineering

摘要

摘要: 讨论了γ-TiAl合金显微组织与蠕变性能的关系,并用PST(Polysynthetically Twinned Crystal,简称PST晶体)晶体研究了片层界面相对于外力轴取向对TiAl合金蠕变性能的影响.认为影响该合金蠕变性能的主要显微组织参数是片层取向,γ体积分数,晶粒尺寸,片层宽度以及晶界形貌,并分析了它们与蠕变性能的关系.提出了如何控制以上显微组织参数,使得该合金具有最佳蠕变抗力.
- 钛添加合金 /
- 蠕变强度 /
- 显微结构
Abstract: The relationship between microstructure and creep behavior of γ-TiAl alloys was analyzed and discussed, and the effect of the orientation of lamellar boundaries with respect to loading axis on the creep behavior of TiAl alloy with fully lamellar structure was studied by using TiAl PST crystals. It is indicated that the primary microstructure parameters which have important influences on the creep behavior are lamellar orientations with respect to loading axis, volume faction of γ grains, lamellar grain size, lamellar width and grain boundary morphology. The way to get high creep resistance by microstructure control has been suggested.
- titanium additions /
- creep resistance /
- microstructure

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参考文献(1)

1. Beddoes J, Wallace W, Zhao L. Current understanding of creep near γ-titanium aluminides. Int Mater Rev, 1995, 40(5):197~218 2. Zhang Y G, Chen C Q, Xu Q, Chatervedi M C. Deformation mechanisms of an unidirectionally-solidified two-phase γ-TiAl-based alloy. Acta Metall Sinica, 1995, 8(6):359~368 3. Minonishi Y,Otsuka M,Tanaka K.Orientation and temperature dependence of deformation of Ti₃Al single crystals.In:Izumi O ed.Inter-metallic Compounds.Sendai:Japan Institute of Metal,1991.543~547 [LL]4. Kim Y-W. Intermetallic alloys based on gamma titanium aluminide. JOM, 1989, 41(7):24~30 5. Beddoes J, Zhao L, Au P, Dudzinki D, Triantafillo J. Microstructural design of near γ-TiAl for creep resistance.In:Nathal M V, Darolia R, Liu C T, Martin P L, Miracle D B, Wagner R, Yamaguchi M, eds. Structural Intermetallics 1997. Champion PA:The Minerals, Metals and Materials, 1997.109~118 6. Kimm D I, Wolfenstine J. Effect of grain size on the creep behavior of fully transformated γ-TiAl. Scripta Metall Mater,1994, 30(2):615~619 7. Beddoes J, Zhao L, Triantafillou J, Au P, Wallace W. Effect of compostion and lamellar microstructure on creep properties of P/M near γ-TiAl alloys. In:Kim Y-W, Wagner R, Yamaguchi M, eds. Gamma Titanium Aluminides. Las Vegas:The Minerals, Metals and Materials, 1995. 959~966 8. Wang J N, Schwartz A J, Nieh T G, Liu C T, Sikka V K, Clemens D. Creep of a fine-grained, fully-lamellar, two-phase TiAl alloy at 760℃. In:Kim Y-W, Wagner R, Yamaguchi M,eds. Gamma Titanium Aluminides. Las Vegas:The Minerals, Metals and Materials, 1995. 949~957 9. Chen W R, Beddoes J, Triantafillou J, Zhao L. Creep of polycrystalline near γ-TiAl with a lamellar microstructure. Acta Metall Sinica, 1996, 9(6):565~570

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