Hayrettin AHLATÇI, Hüseyin ÇİMENOĞLU, Ercan CANDAN

%60 SiC-Al kompozitlerin aşınma davranışına SiC partikül boyutunun etkisi

Bu çalışmada, basınçlı infiltrasyon yöntemi ile üretilmiş olan alüminyum matrisli kompozitlerin eğme mukavemeti ile darbe ve aşınma direncine takviye SiC partikül boyutunun etkisi incelenmiştir. Kompozitlerin oda sıcaklığı mekanik özellikleri eğme ve darbe deneyleri ile belirlenmiştir. % 60 SiC içeren alüminyum matrisli kompozitlerin eğme mukavemeti ve darbe direnci SiC boyutu arttıkça azalmıştır. Kompozitlerin aşınma davranışları metal-metal aşınma deneyleri ile incelenmiştir. Metal-metal aşınma deneyleri kuru kayma koşullarında M2 kalite takım çeliği üzerinde yapılmıştır. Deneyler, numunelere 28 N yük uygulatarak gerçekleştirilmiştir. Aşınma deney sonuçları, iri SiC (37$mu$m) ile takviye edilmiş kompozitlerin, ince SiC (13$mu$m) partikülleri ile takviye edilen kompozitlere nazaran daha yüksek aşınma direnci gösterdiğini ortaya çıkarmıştır.

The effect of SiC size on the wear behaviour of 60 vol % SiC-Al composites

In this study, the effect of the reinforcing particle size on bending strength, impact and wear resistance of SiC reinforced aluminum matrix composites produced by the pressure infiltration technique has been investigated. Room temperature mechanical properties of the composites were determined by three point bending and impact tests. Bending strength and impact resistance of Al-60 vol.% SiC composites decreased with increasing reinforcing SiC particle size. The wear behaviour of the composites were examined by metal-metal wear tests. Results of the wear tests were evaluated according to the weight loss of the composites. The metal-metal wear tests were performed on an unlubricated M2 quality tool steel disc. The tests were carried out by applying a normal load of 28 N to the composites. Wear tests conducted on M2 quality tool steel disc under dry sliding conditions revealed that composites reinforced with coarse SiC particles exhibit higher wear resistance than those with fine SiC particle. After the wear tests, worn surfaces of the composites were examined by a scanning electron microscope. Wear surfaces of the composites worn on M2 quality tool steel have a characteristic view of typical mild wear. Energy dispersive spectroscopy analysis revealed material transfer from M2 tool steel to the composite during testing.

PDF

___

Alpas, A. T. ve Zhang, J., (1992a). Wear Rate Transition in Cast Aluminum Silicon Alloys Reinforced with SiC Particles, Scripta Metallurgica et Materialia, 26, 505-509
Alpas, A. T. ve Zhang, J., (1992b). Effect of SiC Particle Reinforcement on the Dry Sliding Wear of Aluminum-Silicon Alloys (A356), Wear, 155, 83-104.
Alpas, A. T. ve Zhang, J., (1994). Effect of Microstructure (Particulate Size and Volume Fraction) and Counterface Material on the Sliding Wear Resistance of Particulate Reinforced Aluminium Matrix Composites, Metallurgical Transactions A, 25, 969-983.
Antoniou, R. ve Nborland, D. W., (1987). Mild Wear of Al-Si binary Alloys During Unlubricated Sliding, Materials Science and Engineering A, 93, 57-72.
Arsenault, R. J. ve Fisher, P. M., (1983). Microstructure of Fiber and Particulate SiC in 6061 Al Composites, Scripta Metallurgica et Materialia, 17, 67-71.
Arsenault, R. J., Wang, L., Feng, C. R., (1991) Strengthening of Composites due to Microstructural Changes in The Matrix, Acta Metallurgica et Materialia, 39, 47-57.
Bai, M., Xue, Q. ve Guo, H., (1996). Reciprocal Sliding of SiC Particle-Reinforced Al-Cu Aluminium Matrix Composites Against Stainless Steel, High Speed Tool Steel and Ceramics II Wear Mechanisms, Wear, 194, 126-136.
Brechet, Y., Embury, J. D., Tao, S., Luo, L., (1991). Damage Initiation in Metal Matrix Composites, Acta Metallurgica et Materialia, 39, 1781-1786.
Candan, E., Atkinson, H. V. ve Jones, H., (1997). Effect of Magnesium Alloying Additions on Infiltration Treshold Pressure and Structure of SiC Powder Comopacts Infiltrated by Aluminium Based Melts; Journal of Material Science, 32, 289-294.
Candan, E., (1998). Wettability and Pressurized Infiltration of Ceramic Powder Compacts by Metallic Melts, PhD Thesis, Department of Engineering Materials, University of Sheffield UK.
Candan, E., Ahlatcı H. ve Çimenoğlu, H., (2001). Abrasive Wear Behaviour of Al-SiC Composites Produced By Pressure Infiltration Technique, Wear, 247, 133-138.
Chung, S. ve Hwang, B. H., (1994). A Microstructural Study of The Wear Behaviour of SiCp/Al Composites, Tribology International, 27, 307-314.
Hosking, F. M., Folgar Portillo, F., Wunderlin, R., Mehrabian, R., (1982). Composites of Aluminium Alloys: Fabrication and Wear Behaviour, Journal of Materials Science, 17, 477-498.
Hu, M. S., (1991). Some Effect of Particle Size on The Flow Behaviour of Al-SiCp Composites, Scripta Metallurgica et Materialia, 25, 695-700.
Hunt Jr., W. H., Osman, T. M., Lewondowski, J. J., (1993). Micro and Macrostructural Factors in DRA Fracture Resistance, Journal of Metal (JOM), 45, 30-35.
Jiang, J. ve Dodd, B., (1995). Workability of Aluminium Based Metal Matrix Composites in Compression, Composites, 26, 62-66.
Li, X. Y. ve Tandom, K. N., (2000). Microstructural Characterization of Mechanically Mixed Layer and Wear Debris In Sliding Wear of An Al Alloy and An Al-Based Composites, Wear, 245, 148-161.
Ma, Z. Y., Liang, Y. N., Zhang, Y. Z., Lu, Y. X. ve Bi, J., (1996). Sliding Wear Behaviour of SiC Particle Reinforced 2024 Aluminium Alloy Composites, Materials Science and Technology, 12, 751-756
Pramila Bai, P. N., Ramasesh, B. S. ve Surappa, M. K., (1992). Dry Sliding Wear of A 356-Al-SiCp Composites, Wear, 157, 295-304.
Weng, B. J., Chamg, S. T. ve Shiau, J. S., (1992). Microfracture Mechanisms of SiC 6061 Aluminium Composites After Hipping, Scripta Metallurgica et Materialia, 27, 1127-1132.
Yang, Y., Cady, C., Hu, M.S., Zok, F., Mehrabian, R. ve Evans, A. G., (1990). Effect of Damage on the Flow Strength and Ductility of A Ductile Al Alloy Reinforced With SiC Particulates, Acta Metallurgica et Materialia, 38, 2613-2619.