通过SiC/Ti6Al4V钛基复合材料的制备及在不同条件下的热处理试验,利用SEM,EDS及XRD分析技术研究复合材料界面反应产物相的形成及反应元素的扩散路径.结果表明:反应元素如C,Ti,Si在界面反应层中出现浓度波动,合金元素Al并没有显著扩散进入界面反应产物层,而是在界面反应前沿堆积,其界面反应产物被确认为Ti3SiC2,TiCx,Ti5Si3Cx和Ti3Si;在界面反应初期,存在着TiC+Ti5Si3Cx双相区,当形成各界面反应产物单相区时,SiC/Ti6Al4V复合材料界面反应扩散的完整路径应为:SiC | Ti3SiC2 | Ti5Si3Cx | TiCx | Ti3Si | Ti6Al4V+TiCx;界面反应产物层的生长受扩散控制,遵循抛物线生长规律,其生长激活能Qk及k0分别为290.935 kJ·mol-1,2.49×10-2m·s-1/2.
SiC continuous fiber-reinforced Ti6Al4V matrix composites were fabricated and then heat-treated in vacuum under different conditions.The formation of interfacial reaction products and the diffusion path were studied by using of SEM,EDS and XRD methods.The results showed that the content fluctuation of reactive elements such as C,Ti and Si appeared in interfacial reaction layers.Alloying element Al in matrix did not diffuse into interfacial reaction zone remarkably,but piled up in front of the matrix-reaction layer interface,and the interfacial reaction products were identified as Ti3SiC2,TiCx,Ti5Si3Cx and Ti3Si;At the beginning of interfacial reaction,there was a TiCx+Ti5Si3Cx duplex-phase zone.As soon as every single-phase zone formed,the whole diffusion path was to be SiC |Ti3SiC2 | Ti5Si3Cx | TiCx | Ti3Si | Ti6Al4V+TiCx;The interfacial reaction layer growth is controlled by diffusion and follows a role of parabolic rate,and the activation energy Qk and K0 of SiC/Ti6Al4V are 290.935kJ·mol-1 and 2.49×10-2m·s-1/2,respectively.
参考文献
| [1] | 陆盘全;周盛年.[J].航空制造工程,1994(06):35. |
| [2] | Yang Y Q;Dudek H J;Kumpfert J .[J].Materials Science and Engineering,1998,A246:213. |
| [3] | Ratliff J L;Powell G W .Research on Diffusion in Multiphase Ternary Systems[R].Springfield:US Department of Commerce,1971. |
| [4] | Martineau P;Pailler R;Lahaye M et al.[J].Journal of Materials Science,1984,19:2749. |
| [5] | Naka M;Feng J C;Schuster J C .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1997,28A:1385. |
| [6] | Sambasivan S;Petuskey W T .[J].Journal of Materials Research,1992,7(06):1473. |
| [7] | Xun Y W;Tan M J;Zhou J T .[J].Journal of Materials Processing Technology,2000,102:215. |
| [8] | Yang Y Q;Dudek H J;Kumpfert J .[J].Scripta Materialia,1997,37(04):503. |
| [9] | Yang Y Q;Dudek H J;Kumpfert J .[J].Composites Part A:Applied Science and Manufacturing,1998,29A:1235. |
| [10] | 朱艳 .SiC纤维增强Ti基复合材料界面反应研究[D].西北工业大学,2003. |
| [11] | Breuer J;Wilger T;Friesel M et al.[J].INTERMETALLICS,1999,7:381. |
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