Evaluation of HEBM Mechanical Alloying of Al2O3—356/7075 Powder Mixture
Affiliation(s)
Council for Science and Industrial Research, Pretoria, South Africa. University of Johannesburg, Johannesburg, South Africa.
Council for Science and Industrial Research, Pretoria, South Africa. University of Johannesburg, Johannesburg, South Africa.
ABSTRACT
Particle reinforced aluminium alloy metal matrix composites (MMC) have proven to be one of the advanced materials capable of replacing conventional structural alloys. However, the demand for such materials has been confined to high cost applications due to their complex processing. A preliminary mechanical alloying (MA) of metal powder with ce-ramic particulates by High Energy Ball Mill (HEBM) processing is a step of MMC manufacturing process. In this paper mechanical alloying of aluminium alloys A356 and 7075 powder with Al2O3 and SiC par-ticulates using two types of HEBM was investigated. The effect of dispersed phase strengthening mechanism on three aluminium grade alloys was evaluated by micro hardness measurement. Microstructure investigation confirms the achieved strengthening results. It was established that by measuring hardness of alloyed aluminium particles with low load reliable information on the alloying effect can be achieved.
Particle reinforced aluminium alloy metal matrix composites (MMC) have proven to be one of the advanced materials capable of replacing conventional structural alloys. However, the demand for such materials has been confined to high cost applications due to their complex processing. A preliminary mechanical alloying (MA) of metal powder with ce-ramic particulates by High Energy Ball Mill (HEBM) processing is a step of MMC manufacturing process. In this paper mechanical alloying of aluminium alloys A356 and 7075 powder with Al2O3 and SiC par-ticulates using two types of HEBM was investigated. The effect of dispersed phase strengthening mechanism on three aluminium grade alloys was evaluated by micro hardness measurement. Microstructure investigation confirms the achieved strengthening results. It was established that by measuring hardness of alloyed aluminium particles with low load reliable information on the alloying effect can be achieved.
Cite this paper
G. Govender, L. Ivanchev, H. Burger, A. Mulaba and H. Chikwande, "Evaluation of HEBM Mechanical Alloying of Al2O3—356/7075 Powder Mixture," Open Journal of Composite Materials, Vol. 2 No. 2, 2012, pp. 48-53. doi: 10.4236/ojcm.2012.22007.
G. Govender, L. Ivanchev, H. Burger, A. Mulaba and H. Chikwande, "Evaluation of HEBM Mechanical Alloying of Al2O3—356/7075 Powder Mixture," Open Journal of Composite Materials, Vol. 2 No. 2, 2012, pp. 48-53. doi: 10.4236/ojcm.2012.22007.
References
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[1] C. Suryanarayana, “Mechanical Alloying and Milling,” Progress in Materials Science, Vol. 46, No. 1-2, 2001, pp. 1-184. doi:10.1016/S0079-6425(99)00010-9 [2] K. U. Kainer, “Basic of Metal Matrix Composites,” In: K. U. Kainer, Ed., Metal Matrix Composites. Custom Made for Automotive and Aero-space Engineering, Wiley-VCH Verlag GmbH & Co. KGaA, 2006, pp. 1-54. [3] E. Hochreiter, et al., “Preparing Particle Reinforced Al- MMCs by Mechanical Alloying,” Journal de Physique Archives, Vol. 3, No. C7, 1993, pp. 1829-1832. doi: 10.1051/jp4:19937291 [4] M. Adamiak, “Mechanical Alloying for Fabrication of Aluminium Matrix Composite Powders with Ti-Al Intermetallics Reinforcement,” Journal of Achievements in Materials and Manufacturing Engineering, Vol. 31, No. 2, 2008, pp. 191-196. [5] E. M. Ruiz-Navas, et al., “One Step Production of Aluminium Matrix Composite Powders by Mechanical Alloying,” Composites Part A: Applied Science and Manufacturing, Vol. 37, No. 11, 2006, pp. 2114-2120. doi: 10.1016/j.compositesa.2005.11.016 [6] R. Sankar and P. Singh, “Sintesis of 7075 Al/SiC Particulate Composite Powders by Mechanical Alloying,” Materials Letters, Vol. 36, No. 1-4, 1998, pp. 201-205. doi:10.1016/S0167-577X(98)00026-3 [7] Y.-C. Kang and S. L.-I. Chan, “Tensile Properties of Nanometric Al2O3 Particu-late-Reinforced Aluminium Matrix Composites,” Materials Chemistry and Physics, Vol. 85, No. 2-3, 2004, pp. 438-443. doi:10.1016/j.matchemphys.2004.02.002 [8] A. Ahmed et al., “Synthesis, Tensile Testing and Microstructural Characterization of Nanometric SiC Particulate-Reinforced Al 7075 Matrix Composites,” Metallurgical and Materials Transactions A, Vol. 41, No. 6, 2010, pp. 1582-1591. doi:10.1007/s11661-010-0201-y [9] C. Suryanarayana, “Re-cent Development in Mechanical Alloying,” Reviews on Ad-vanced Materials Science, Vol. 18, 2006, pp. 203-211. [10] Particle Reinforced Aluminium Alloy. http://www.amc-mmc.co.uk [11] C. Capdevila and H. K. D. H. Bhadeshia, “ Manufacturing and Microstructural Evolution of Mechanically Alloyed Oxide Dispersion Strengthened Superal-loys,” Advanced Engineering Materials, Vol. 3, No. 9, 2001, pp. 647-656. doi:10.1002/1527-2648(200109)3:9<647::AID-ADEM647>3.0.CO;2-4 [12] N. G. Zhao, P. Nash and X. J. Yang, “The Effect of Mechanical Alloying on SiC Distribution and the Properties of 6061 Aluminium Composites,” Journal of Materials Proc-essing Technology, Vol. 170, No. 3, 2005, pp. 586-592. doi:10.1016/j.jmatprotec.2005.06.037