In this study ball milling of Al356 and Al2O3 powder mixture was carried out in order to produce Al356-Al2O3 nano-composite containing 20 vol.% Al2O3. The structural evolution and morphological changes of powder particles during ball milling were studied by X-ray diffractometery and scanning electron microscopy analysis. As a result of ball milling Al2O3 particles were uniformly dispersed in Al356 matrix. Furthermore the crystallite size of the Al356 decreased to 25 nm after ball milling for 10 h. Morphological studies of powder particles indicated that the powder particle size continuously decreases with increasing milling time. Hardness and elastic modulus values of powder particles were measured by nanoindentation method. It was found that the hardness and elastic modulus of Al356-20 vol.% Al2O3 nanocomposite were about 216 Hv and 86 GPa, respectively which is higher than 75 Hv and 74 GPa for as-received Al356.
References
[1]
S. M. Zebarjad and S. A. Sajjadi, “Dependency of Physical and Mechanical Properties of Mechanical Alloyed Al-Al2O3 Composite on Milling Time,” Materials & De-sign, Vol. 28, No. 7, 2007, pp. 2113-2120.
[2]
V. Sethi, “Effect of Aging on Abrasive Wear Resistance of Silicon Carbide Particulate Reinforced Aluminum Matrix Composite,” MSc. Thesis, Univ. of Cincinnati, 2007.
[3]
A. Pyzalla, B. Camin, B. Lehrer, M. Wichert, A. Koch, K. Zimnik, E. Boller and W. Reimers, “In-Situ Observation of Creep Damage in Al-Al2O3 MMCs by Synchrotron X-Ray Tomography,” International Centre for Diffraction Data, 2006, pp. 1097-2102.
[4]
S. C. Tjong, “Novel Nanoparticle-Reinforced Metal Matrix Composites with Enhanced Mechanical Properties,” Adv. Eng. Mater., Vol. 8, 2007, pp. 639-652.[
[5]
A. Ibrahim, F. A. Mohamed and E. J. Lavernia, “Parti-culate Reinforced Metal Matrix Composite,” J. Mater. Sci. A, Vol. 26, 1991, pp. 1137-1156.
[6]
A. Bhaduri, V. Gopinathan and P. Ramakrishnan, “Mi-crostructural Changes in a Mechanically Alloyed Al-6.2 Zn-2.5 Mg-1.7 Cu Alloy (7010) with and without Parti-culate SiC Reinforcement,” Metal Trans. A, Vol. 27, 1995, pp. 3718-3726.
[7]
A. Olszowka-Myalska, S. Janusz and J. Cwajna, “Cha-racterization of Reinforcement Distribution in Al/Al2O3 System Composite Obtained from Composite Powder,” Mater. Charact., Vol. 46, 2001, pp. 189-195.
[8]
K. M. Shorowordi, T. Laoui, A. S. M. A. Haseeb and J.P. Celis, “Microstructure and Interface Characteristics of B4C, SiC and Al2O3 Reinforced Al Matrix Composite: A Comparative Study,” J. Mater. Process. Tech., Vol. 142, 2003, pp. 738-743.
[9]
C. Shuangje and W. Renjie, “The Structure and Bending Properties of Squeeze-Cast Composites of A356 Alumi-num Alloy Reinforced with Alumina Particles,” Comp. Sci. Tech., Vol. 59, 1999, pp. 157-162.
[10]
B. Prabhu, C. Suryanarayana, L. An and R. Vaidyanathan, “Synthesis and Characterization of High Volume Fraction Al-Al2O3 Nanocomposite Powders by High-Energy Mil-ling,” Mater. Sci. Eng. A, Vol. 425, 2006, pp. 192-200.
[11]
G. J. Howell and A. Ball, “Dry Sliding Wear of Particu-late-Reinforced Aluminum Alloys against Automobile Friction Materials,” Wear, Vol. 181, 1995, pp. 379-390.
[12]
P. R. Soni, “Mechanical alloying: fundamentals and ap-plications,” Cambridge International Science Publishing, 1999.
[13]
M. Tavoosi, F. Karimzadeh and M. H. Enayati, “Wear Behaviour of Al-Al2O3 Nanocomposites Prepared by Mechanical Alloying and Hot Pressing,” Mater. Sci. Technol., In press.
[14]
M. M. Moshksar and S. M. Zebarjad, “Effect of Milling Parameters on Milling of Metallic Powders,” Proceeding of Nonferrous Metals, Iran, Kerman, 1996, pp. 913-917.
[15]
M. M. Moshksar and S. M. Zebarjad, “Morphology and size Distribution of Aluminum Powder during Milling Processing,” Iran. J. Sci. Technol., Vol. 23, 1996, pp. 150-154.
[16]
S. M. Zebarjad and S. A. Sajjadi, “Microstructure Evalua-tion of Al–Al2O3 Composite Produced by Mechanical Alloying Method,” Mater. Des., Vol. 27, 2006, pp. 684-688.
[17]
Z. Razavi Hesabi, A. Simchi and S. M. Seyed Reihani, “Structural Evolution during Mechanical Milling of Na-
nometric and Micrometric Al2O3 Reinforced Al Matrix Composite,” Mater. Sci. Eng. A, Vol. 428, 2006, pp. 159-168.
[18]
E. M. Ruiz-Navas, J. B. Fogagnolo, F. Velasco and L. Froyn, “One Step Production of Aluminum Matrix Com-posite Powder by Mechanical Alloying,” Comp. Part A., Vol. 37, 2006, pp. 2114-2120.
[19]
G. K. Williamson and W. H. Hall, “X-ray Line Broadening from Filed Aluminium and Wolfram,” Acta Metall., Vol. 1, 1953, pp. 22-31.
[20]
W. C. Oliver and G. M. Pharr, “Measurement of Hardness and Elastic Modulus by Instrumented Indentation: Ad-vances in Understanding and Refinements to Methodolo-gy,” J. Mater. Res., Vol. 19, 2004, pp. 3-20.
[21]
A. C. Fischer-Cripps, “Review of Analysis and Interpre-tation of Nanoindentation Test Data,” Surf. Coat. Technol., Vol. 200, 2006, pp. 4153-4165.
[22]
C. A. Schuh, “Nanoindentation Studies of Materials,” Mater. Today., Vol. 9, 2006, pp. 32-49.
[23]
A. Gouldstone, N. Chollacoop, M. Dao, J. Li, A. M. Mi-nor and Y.L. Shen, “Indentation across Size Scales and Disciplines: Recent Developments in Experimentation and Modeling,” Acta Mater., Vol. 55, 2007, pp. 4015-4039.
[24]
Y. Golovin, “Nanoindentation and Mechanical Properties of Solids in Submicrovolumes, Thin Near-Surface Layers, and Films: A Review,” Phys. Solid. State., Vol. 50, 2008, pp. 2205–2236.
[25]
C. L. Chen, A. Richter and R. C. Thomson, “Mechanical Properties of Intermetallic Phases in Multi-Component Al-Si Alloys Using Nanoindentation,” Intermetallics, Vol. 17, 2009, pp. 634–641.
[26]
W. C. Oliver and G. M. Pharr, “An Improved Technique for Determining Hardness and Elastic-Modulus Using Load and Displacement Sensing Indentation Experiments,” J. Mater. Res., Vol. 7, 1992, pp. 1564-1583.
[27]
G. Simmons and H. Wang, “Single Crystal Elastic Con-stants and Calculated Aggregate Properties,” A Handbook, Cambridge, MIT Press, 1971.
[28]
C. Suryanarayana, “Mechanical Alloying and Milling,” Prog. Mater. Sci., Vol. 46, 2001, pp. 1-184.
[29]
D. J. Lloyd, “Particle Reinforced Aluminium and Magne-sium Matrix Composites,” Int. Mater. Rev., Vol. 39, 1994, pp. 1-24.
[30]
G. E. Dieter, “Mechanical metallurgy,” Third Ed, McGraw-Hill, Berlin, 1976.
[31]
T. C. Chou, T. G. Nieh, S. D. McAdams, G. M. Pharr and W. C. Oliver, “Mechanical Properties and Microstructures of Metal/Ceramic Microlaminates: Part II. A Mo/Al2O3 System,” J. Mater. Res., Vol. 10, 1992, pp. 2774-2784.
