Mechanical Behavior of Al-SiCnp Nanocomposite Fabricated by Hot Extrusion Technique

Document Type: Original Article

Authors

1 Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

2 Faculty of Engineering, Shahrekord University, Shahrekord, Iran

Abstract

In this paper, fabrication and characterization of Al-SiC nanocomposites is investigated. The Al matrix is reinforced with different amounts of SiC nano-particles using mechanical milling, cold pressing, and, hot extrusion techniques. To get the best quality of the samples, the extrusion process is optimized firstly. With this regard, hot extrusion parameters such as the rate of extrusion, temperature, the extrusion ratio, lubrication, and the die set dimensions are experimentally studied. Finally, the nanocomposites with relative density more than 99% could be successfully fabricated under extrusion ratio of 8.5:1. As-extruded billets were then used to prepare standard tensile test specimens based on ASTM-E8. Afterwards, relative density, tensile behaviour, and micro-hardness of the samples were determined. The results show about 50% improvement for both the tensile strength and micro-hardness and near 1% reduction of relative density as the content of SiC reinforcement increases to 3 vol%. Therefore, specimens with higher strength-to-weight ratio which is a key parameter in aerospace and automotive applications can be produced using current techniques.    

Keywords


  1. Nanocomposite samples with relative density more than 99% are fabricated successfully using mechanical milling, cold pressing, and hot extrusion processes.
  2. Relative density of the samples decreases less than 1% as the content of SiC nano reinforcements increases to 3 vol%.
  3. Both the tensile strength and Vickers micro-hardness of the samples improve by about 50% after adding 3 vol% SiC reinforcement.
  4. The improvement of tensile strength may be attributed to uniform dispersion of SiC nano particles between Al micro particles and also some strengthening mechanisms like the Orowan and load bearing effects.
  5. Variation of Vickers micro-hardness agrees well with variation of the yield strength. This agreement verifies also the Tabor equation.

ACKNOWLEDGEMENT

This work has been made possible through the financial support of Islamic Azad University, Najafabad Branch, under research grant No.1509507140040.

REFERENCES

[1]     Atrian, A., Majzoobi, G. H., Enayati, M. H., and Bakhtiari, H., “Mechanical and Microstructural Characterization of Al7075/SiC Nanocomposites Fabricated by Dynamic Compaction”, International Journal of Minerals, Metallurgy, and Materials, Vol. 21, No. 3, 2014, pp. 295-303.

[2]     Atrian, A., Majzoobi, G. H., Enayati, M. H., and Bakhtiari, H., “A Comparative Study on Hot Dynamic Compaction and Quasi-Static Hot Pressing of Al7075/SiCnp Nanocomposite”, Advanced Powder Technology, Vol. 26, No. 1, 2015, pp. 73-82.

[3]     Majzoobi, G. H., Atrian, A., and Enayati, M. H., “Tribological Properties of Al7075-SiC Nanocomposite Prepared by Hot Dynamic Compaction”, Composite Interfaces, Vol. 22, No. 7, 2015, pp. 579-93.

[4]     El-Kady, O., Fathy, A., “Effect of SiC Particle Size on the Physical and Mechanical Properties of Extruded Al Matrix Vanocomposites”, Materials & Design, Vol. 54, 2014, pp. 348-53.

[5]     Jafari, M., Abbasi, M. H., Enayati, M. H., and Karimzadeh, F., “Mechanical Properties of Nanostructured Al2024–MWCNT Composite Prepared by Optimized Mechanical Milling and Hot Pressing Methods”, Advanced Powder Technology, Vol. 23, No. 2, 2012, pp. 205-10.

[6]     Ghasemi Yazdabadi, H., Ekrami, A., Kim, H. S., and Simchi, A., “An Investigation on the Fatigue Fracture of P/M Al-SiC Nanocomposites”, Metallurgical and Materials Transactions A., Vol. 44, No. 6, 2013, pp. 2662-71.

[7]     Majzoobi, G. H., Bakhtiari, H., Atrian, A., Pipelzadeh, M., and Hardy, S., “Warm Dynamic Compaction of Al6061/SiC Nanocomposite Powders”, Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials Design and Applications, Vol. 230, No. 2, 2015, pp. 375-387.

[8]     Sajjadi, S. A., Ezatpour, H. R., and Torabi Parizi, M., “Comparison of Microstructure and Mechanical Properties of A356 Aluminum Alloy/Al2O3 Composites Fabricated by Stir and Compo-Casting Processes”, Materials & Design, Vol. 34, 2012, pp. 106-11.

[9]     Abdollahi, A., Alizadeh, A., and Baharvandi, H. R., “Dry Sliding Tribological Behavior and Mechanical Properties of Al2024–5 wt.%B4C Nanocomposite Produced by Mechanical Milling and Hot Extrusion”, Materials & Design, Vol. 55, pp. 471-81.

[10]  Fathy, A., Sadoun, A., and Abdelhameed, M., “Effect of Matrix/reinforcement Particle Size Ratio (PSR) on the Mechanical Properties of Extruded Al–SiC Composites”, The International Journal of Advanced Manufacturing Technology, Vol. 73, No. 5, 2014, pp. 1049-56.

[11]  Rizaneh, S., Borhani, G. H., and Tavoosi, M., “Synthesis and Characterization of Al (Al2O3–TiB2/Fe) Nanocomposite by Means of Mechanical Alloying and Hot Extrusion Processes”, Advanced Powder Technology, Vol. 25, No. 6, 2014, pp. 1693-8.

[12]  Senthilkumar, R., Arunkumar, N., and Manzoor Hussian, M., “A Comparative Study on Low Cycle Fatigue Behaviour of Nano and Micro Al2O3 Reinforced AA2014 Particulate Hybrid Composites”, Results in Physics, Vol. 5, 2015, pp. 273-80.

[13]  Taleghani, P. R., Bakhshi, S. R., Erfanmanesh, M., Borhani, G. H., and Vafaei, R., “Improvement of MoSi2 Oxidation Resistance Via Boron Addition: Fabrication of MoB/MoSi2 Composite by Mechanical Alloying and Subsequent Reactive Sintering”, Powder Technology, Vol. 254, pp. 241-7.

[14]  Tavoosi, M., Rizaneh, S., and Borhani, G. H., "The Effect of Al2O3–TiB2/Fe Complex Reinforcement on Wear and Mechanical Properties of Al-Matrix Composites”, Transactions of the Indian Institute of Metals, Vol. 1, 2016, pp. 1-5.

[15]  Kumar, S., “Technology of Metal Forming Processes”, New Delhi, PHI Learning, 2008.

[16]  Majzoobi, G. H., Atrian, A., and Pipelzadeh, M. K., “Effect of Densification Rate on Consolidation and Properties of Al7075–B4C Composite Powder”, Powder Metallurgy, Vol. 58, No. 4, 2015, pp. 281-8.

[17]  Pieralini, A. R., Benjamin, C. M., Ribeiro, R. F., Scaf, G., and Adabo, G. L., “The Effect of Coating Patterns with Spinel-Based Investment on the Castability and Porosity of Titanium Cast into Three Phosphate-Bonded Investments”, Journal of prosthodontics: Official Journal of the American College of Prosthodontists, Vol. 19, No. 7, 2010, pp. 517-22.

[18]  Mohanty, R. M., Balasubramanian, K., and Seshadri, S. K., “Boron Carbide-Reinforced Alumnium 1100 Matrix Composites: Fabrication and Properties”, Materials Science and Engineering: A, Vol. 498, No. 1-2, 2008, pp. 42-52.

[19]  Razavi-Tousi, S. S., Yazdani-Rad, R., and Manafi, S. A., “Effect of Volume Fraction and Particle Size of Alumina Reinforcement on Compaction and Densification Behavior of Al–Al2O3 Nanocomposites”, Materials Science and Engineering: A, Vol. 528, No. 3, 2011, pp. 1105-10.

[20]  Zhang, Z., Chen, D. L., “Consideration of Orowan Strengthening Effect in Particulate-Reinforced Metal Matrix Nanocomposites: A Model for Predicting Their Yield Strength”, Scripta Materialia, Vol. 54, No. 7, 2006, pp. 1321-6.

[21]  Oñoro, J., Salvador, M. D., and Cambronero, L. E. G., “High-Temperature Mechanical Properties of Aluminium Alloys Reinforced with Boron Carbide Particles”, Materials Science and Engineering: A, Vol. 499, No. 1-2, 2009, pp. 421-6.

[22]  Dunand, D., Mortensen, A., “Thermal Mismatch Dislocations Produced by Large Particles in a Strain-Hardening Matrix”, Materials Science and Engineering: A, Vol. 135, No. 0, 1991, pp. 179-84.

[23]  Dong, Y. L., Xu, F. M., Shi, X. L., Zhang, C., Zhang, Z. J., Yang, J. M., et al., “Fabrication and Mechanical Properties of Nano-/Micro-Sized Al2O3/SiC Composites”, Materials Science and Engineering: A, Vol. 504, No. 1-2, 2009, pp. 49-54.

[24]  El-Daly, A. A., Abdelhameed, M., Hashish, M., and Daoush, W. M., “Fabrication of Silicon Carbide Reinforced Aluminum Matrix Nanocomposites and Characterization of its Mechanical Properties using Non-Destructive Technique”, Materials Science and Engineering: A, Vol. 559, No. 0, 2013, pp. 384-93.

[25]  Shirvanimoghaddam, K., Khayyam, H., Abdizadeh, H., Akbari, M. K., Pakseresht, A. H., Ghasali, E., et al., “Boron Carbide Reinforced Aluminium Matrix Composite: Physical, Mechanical Characterization and Mathematical Modelling”, Materials Science & Engineering A, Vol. 658, 2016, pp. 135-49.

[26]  Wei, C. T., Vitali, E., Jiang, F., Du, S. W., Benson, D. J., Vecchio, K. ., et al., “Quasi-Static and Dynamic Response of Explosively Consolidated Metal–Aluminum Powder Mixtures”, Acta Materialia, Vol. 60, No. 3, 2012, pp. 1418-32.