Preparation and microstructural analysis of Ti₂AlC/TiAl(Nb) composite

Abstract

By using the spark plasma sintering process, Ti₂AlC/TiAl composite with the addition of Niobium (Nb) was prepared in-situ and the microstructure of Ti₂AlC/TiAl (Nb) composite was investigated by means of transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). The results indicate that new-formed Ti₂AlC particles disperse with a high degree of uniformity and well combine with the matrix. In the area of phase interface the d-spaces of Ti₂AlC (100) and TiAl (110) were measured as 0.2648 nm and 0.2991 nm, respectively. The atom arrangement beside the interface was only partly corresponding, existing in semicoherent state. On the contrary, in the area of grain interface the d-spaces of TiAl (100) and TiAl (110) were measured as 0.2462 nm and 0.2631 nm, respectively and the atom arrangement beside the interface was almost corresponding, existing in coherent state

Keywords

Ti₂AlC/TiAl (Nb) composite / interface / semicoherent structure / coherent structure

References

[1] Guoding Zhang. Interfaces in Metal Matrix Composites [J]. Chinese Journal of Materials Research, 1997(6): 649–657

[2] Kim Y. W. Ordered Intermetallic Alloys, part III: Gamma Titanium Aluminides [J]. JOM, 1994, 41(7): 30-39.

[3] Deve H. E., Evans A. G., Shih D. S. A High-toughness γ-Titanium Aluminides[J]. Acta Metall. Mater., 1992, 40(6): 1 259-1 264.

[4] Warier S G, Chen S D, Wu S K, et al. The Deformation and Fracture of TiAl at Elevated Temperatures[J]. Met. Trans., 1996 (27): 1 379–1 384

[5] Mei z., Gu M. Y., Wu R. Characterization of Metal Matrix Composite Interface and Its Advances [J]. Materials Science and Engineering, 1996, 14(3): 1-5.

[6] Ibrahim I A, Mohamed F A, Lavernia E J. Particulate Reinforced Metal Matrix Composites, A Review [J]. Mater. Sci., 1991 (26): 1 137–1 156

[7] Zhang J., Liu K., Zhou M. Development and Application of Spark Plasma Sintering [J]. Power Metallurgy Technology, 2002, 20(3): 129-135.

[8] Yue Y.-l., Wu H.-t., Wang C.-b., . Development of Studies of TiAl Intermetallic [J]. Journal of Jinan University, 2004, 18(1): 32-34.

[9] Hu S., He guiyu. New Ti-Toughened TiAl Composites [J]. Journal of Northwestern Polytechnical University, 1996, 14(1): 149-152.

[10] He G., Li l., Chu shuangjie. TiAl Matrix Composites Reinforced by Ti-Fiber Coated with Al₂O₃ [J]. Ordnance Materials Science and Engineering, 1996, 19(2): 3-8.

[11] Zhang C., He g., Wu jiansheng. Fundamental Investigation of TiNb Fiber Continuously Reinforced Ti-48Al-2Cr-2Nb Matrix Composites [J]. Materials Science and Technology, 2000, 8(4): 77-79.

[12] Venkateswara K. T. On the Contrasting Role of Ductilephase Reinforcements in the Fracture Toughness and Fatiguecrack Propagation Behavior of TiNb/γ-TiAl Intermetallic Matrix Composites [J]. Acta.Metall. Mater., 1992, 40(2): 353-361.

[13] Yue Y.-l., Gong Y.-s., Wu H.-t., . Fabrication and Mechanical Properties of TiC Particles Reinforced TiAl Composite [J]. Journal of Wuhan University of Technology-Materials Science Edition, 2003, 19(1): 1-4.

[14] Schuster J C, Nowotny H, Vaccaro C. The Ternary System: Cr-Al-C, V-Al-C and the Behavior of H-Phases (M₂AlC) [J]. Solid State Chemistry, 1980(32): 213–219

[15] Bi G., Wang H., Wu R. Characterization and Measurement of Interfacial Reaction in Metal Matrix Composites [J]. Materials for Mechanical Engineering, 1999, 23(5): 1-4.