In-situ fabrication of Al(Zn)−Al₂O₃ graded composite using the aluminothermic reaction during hot pressing

Abstract

In this study, the fabrication of multilayer Al(Zn)–Al₂O₃ with different volume fractions of Al₂O₃ was investigated. Al and ZnO powders were milled by a planetary ball mill, after which five-layer functionally graded samples were produced through hot pressing at 580°C and 90 MPa pressure for 30 min. Formation of reinforcing Al₂O₃ particles occurred in the aluminum matrix via the aluminothermic reaction. Determination of the ignition temperature of the aluminothermic reaction was accomplished using differential thermal and thermogravimetric analyses. Scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffractometery analyses were utilized to characterize the specimens. The thermal analysis results showed that the ignition temperatures for the aluminothermic reaction of layers with the highest and lowest ZnO contents were 667 and 670°C, respectively. Microstructural observation and chemical analysis confirmed the fabrication of Al(Zn)–Al₂O₃ functionally graded materials composites with precipitation of additional Zn in the matrix. Moreover, nearly dense functionally graded samples demonstrated minimum and maximum hardness values of HV 75 and HV 130, respectively.

Keywords

metal-matrix composites / functionally graded composites / thermogravimetric analysis / powder processing / sintering

References

[1] Lian Y., Liu X., Xu Z., Song J., Yu Y. Preparation and properties of CVD-W coated W/Cu FGM mock-ups. Fusion Eng. Des., 2013, 88(9-10): 1694.

[2] Jung Y.G., Park S.W., Choi S.C. Effect of CH4 and H2 on CVD of SiC and TiC for possible fabrication of SiC/TiC/C FGM. Mater. Lett., 1997, 30(5-6): 339.

[3] Kieback B., Neubrand A., Riedel H. Processing techniques for functionally graded materials. Mater. Sci. Eng, A, 2003, 362(1-2): 81.

[4] Dikici B., Gavgali M. The effect of sintering time on synthesis of in situ submicron α-Al₂O₃ particles by the exothermic reactions of CuO particles in molten pure Al. J. Alloys Compd., 2013, 551, 101.

[5] Feng C., Froyen L. In-situ P/M Al/(ZrB₂ + Al₂O₃) MMCs: processing, microstructure and mechanical characterization. Acta Mater., 1999, 47(18): 4571.

[6] Razavi-Tousi S., Yazdani-Rad R., Manafi S.A. Effect of volume fraction and particle size of alumina reinforcement on compaction and densification behavior of Al–Al₂O₃ nanocomposites. Mater. Sci. Eng, A, 2011, 528(3): 1105.

[7] Tavoosi M., Karimzadeh F., Enayati M., Heidarpour A. Bulk Al–Zn/Al₂O₃ nanocomposite prepared by reactive milling and hot pressing methods. J. Alloys Compd., 2009, 475(1-2): 198.

[8] Durai T.G., Das K., Das S. Al(Zn)–4Cu/Al₂O₃ in-situ metal matrix composite synthesized by displacement reactions. J. Alloys Compd., 2008, 457(1-2): 435.

[9] Zahid G.H., Azhar T., Musaddiq M., Rizvi S.S., Ashraf M., Hussain N., Iqbal M. In-situ processing and aging behaviour of an aluminium/Al₂O₃ composite. Mater. Des., 2011, 32(3): 1630.

[10] Yu P., Deng C.J., Ma N.G., Yau M.Y., Ng D.H.L. Formation of nanostructured eutectic network in α-Al₂O₃ reinforced Al–Cu alloy matrix composite. Acta Mater., 2003, 51(12): 3445.

[11] Yang B., Sun M., Gan G.S., Xu C.G., Huang Z.J., Zhang H.B., Fang Z.Z. In-situ Al₂O₃ particle-reinforced Al and Cu matrix composites synthesized by displacement reactions. J. Alloys Compd., 2010, 494(1-2): 261.

[12] Wu J.M., Li Z.Z. Nanostructured composite obtained by mechanically driven reduction reaction of CuO and Al powder mixture. J. Alloys Compd., 2000, 299(1-2): 9.

[13] Huang Z.J., Yang B., Cui H., Zhang J.S. Study on the fabrication of Al matrix composites strengthened by combined in-situ alumina particle and in-situ alloying elements. Mater. Sci. Eng, A, 2003, 351(1-2): 15.

[14] Fogagnolo J.B., Pallone E.M.J.A., Martin D.R., Kiminami C.S., Bolfarini C., Botta W.J. Processing of Al matrix composites reinforced with Al–Ni compounds and Al₂O₃ by reactive milling and reactive sintering. J. Alloys Compd., 2009, 471(1-2): 448.

[15] Chen Z.C., Takeda T., Ikeda K. Microstructural evolution of reactive-sintered aluminum matrix composites. Compos. Sci. Technol., 2008, 68(10-11): 2245.

[16] Dilip J.J.S., Reddy B.S.B., Das S., Das K. In-situ Al-based bulk nanocomposites by solid–state aluminothermic reaction in Al–Ti–O system. J. Alloys Compd., 2009, 475(1-2): 178.

[17] Zhu H.G., Min J., Li J.L., Ai Y.L., Ge L.Q., Wang H.Z. In situ fabrication of (α-Al₂O₃+Al3Zr)/Al composites in an Al–ZrO₂ system. Compos. Sci. Technol., 2010, 70(15): 2183.

[18] Woo K.D., Lee H.B. Fabrication of Al alloy matrix composite reinforced with subsive-sized Al₂O₃ particles by the in situ displacement reaction using high-energy ball-milled powder. Mater. Sci. Eng, A, 2007, 449-451, 829.

[19] Nagae T., Mizubayashi M., Yokota M., Nose M., Ishiguro T., Saji S. Pulse current pressure sintering of Al/Al₂O₃ functionally graded material. Proceedings of the International Symposium on Novel Materials Processing by Advanced Electromagnetic Energy Sources, 2005 301.

[20] Thirtha Prasad H.P., Chikkanna N. Experimental investigation on the effect of particle loading on microstructural, mechanical and fractural properties of Al/Al₂O₃ functionally graded materials. Int. J. Adv. Eng. Technol., 2011, 2(4): 161.

[21] Tao H., Deng C.J., Zhang L.M., Yuan R.Z. Fabrication of Al/Al₂O₃ composites and FGM. J. Mater. Sci. and Technol., 2001, 17(6): 646.

[22] Maleki A., Panjepour M., Niroumand B., Meratian M. Mechanism of zinc oxide–aluminum aluminothermic reaction. J. Mater. Sci., 2010, 45(20): 5574.

[23] ASM International, ASM Handbook: Volume 3: Alloy Phase Diagrams, ASM International, 1992.

[24] Hasani S., Panjepour M., Shamanian M. Oxidation and kinetic analysis of pure aluminum powder under nonisothermal condition. Open Access Scientific Reports, 2012, 1(8): 1.

[25] Durai T.G., Das K., Das S. Synthesis and characterization of Al matrix composites reinforced by in situ alumina particulates. Mater. Sci. Eng, A, 2006, 445-446, 100.

[26] German R.M. Powder Metallurgy Science, 1984, Princeton, Metal Powder Industries 279.

[27] Zhu H.G., Min J., Li J.L., Ai Y.L., Ge L.Q., Wang H.Z. In situ fabrication of (α-Al₂O₃ + Al3Zr)/Al composites in an Al–ZrO₂ system. Compos. Sci. Technol., 2010, 70(15): 2183.