ABSTRACT The effect of surface roughness average of hypereutectic aluminum silicon alloys (with 16 wt% Si) on the friction and wear was investigated. Various surface roughness average (Ra) of different degrees was verified as well as three different loads 10, 20 and 30 N, speeds 200, 300 and 400 rpm and relative humidity 77%. Different surface preparation techniques are resulted in different Ra values from (6, 8 and 12) ± 0.05 μm. The contacts were dried sliding and lubricated regime at 2.5 centimeters per second. Surfaces were analyzed with scanning electron microscopy and X-ray dispersive analyses. It was noted that the weighted and volumetric wear rate decreases as degree of roughness decreases, as well as coefficient of friction is considered as a function of the stability state. Wear rate is decreased and the transition stress from high to low wear is increased with increasing surface roughness average. There was a correlation between friction coefficient and hardness.
Cite this paper
R. Al-Samarai, H. , K. Ahmad and Y. Al-Douri, "Evaluate the Effects of Various Surface Roughness on the Tribological Characteristics under Dry and Lubricated Conditions for Al-Si Alloy," Journal of Surface Engineered Materials and Advanced Technology, Vol. 2 No. 3, 2012, pp. 167-173. doi: 10.4236/jsemat.2012.23027.
 M. A. De Buergo, C. Vazquez-Calvo and R. Fort, “The Measurement of Surface Roughness to Determine the Suitability,” Geophysical Research Abstracts, Vol. 13, 2011, pp. 6443-6444.
 M. J. Caton, J. W. Jones, H. Mayer, S. Stanzl and J. E. Allison, “Demonstration of an Endurance Limit in 319 Aluminum,” Chemistry and Materials Science, Vol. 34, No. 1, 2003, pp. 33-40.
 N. B. Nadu and T. V. Bi, “Effects of Surface Roughness on Porous Inclined Slider Bearings Lubricated with Micropolar Fluids,” Journal of Marine Science and Technology, Vol. 15, No. 4, 2007, pp. 278-286.
 T. Mathia, F. Louis, G. Maeder and D. Mairey, “Relationships between Surfaces States, Finishing Processes and Engineering Properties,” Wear, Vol. 83, No. 2, 1982, pp. 241-250. doi:10.1016/0043-1648(82)90180-6
 R. P. M. Procter, “Effect of Ion Implantation on Fatigue, Fretting and Fretting-Corrosion of Ti6Al-4V,” Materials Science and Engineering, Vol. 115, 1989, pp. 307-314.
 A. J. Lee, “Cast Aluminum Alloy for High Tempruger Applications,” In: S. K. Das, Ed., Automotive Alloys 2003, The Minerals, Metals & Materials Society, NASA-Marshall, 2003.
 P. Chowdhury, S. Das and B. K. Datta, “Effect of Ni on the Wear Behavior of a Zinc Aluminum Alloy,” Journal of Materials Science, Vol. 37, No. 10, 2002, pp. 2103- 2107. doi:10.1023/A:1015297904125
 M. A. Chowdhury and M. M. Helali, “The Frictional Behavior of Mild Steel under Horizontal Vibration,” Tribology International, Vol. 42, No. 6, 2009, pp. 946-950.
 M. L. Singla and V. I. Chawla, “Study of Wear Properties of Al-SiC Composites,” Journal of Minerals & Materials Characterization & Engineering, Vol. 8, No. 10, 2009, pp. 813-819.
 P. L. Menezes and S. V. Kishore, “Influence of Roughness Parameters on Co-efficient of Friction under Lubricated Conditions,” Sadhana: Academy Proceedings in Engineering Sciences, Vol. 33, No. 3, 2008, pp. 181-190.
 K. J. Ku and T. G. Math, “Interface Roughness Effectfriction Map under Fretting Contact Conditions,” Tribogy International, Vol. 43, No. 8, 2010, pp. 1500-1507
 K. Kadirgama, M. Noor and M. M. Raman, “Surface Roughness Prediction Model 6061-T6 Aluminium Alloy Machining Using Statistical Method,” European Journal of Scientific Research, Vol. 25, No. 2, 2009, pp. 250-256.
 Y. A. Karpenko and A. Akay, “Mechanical Engineering, A Numerical Model of Friction between Rough Surfaces,” Tribology International, Vol. 34, No. 8, 2001, pp. 531- 545. doi:10.1016/S0301-679X(01)00044-5
 T. Rosalind and V. Wong, “Effects of Small-Scale Texturing on Ring Liner Friction in Largebore,” ASME Internal Combustion Engine Division Fall Technical Conference, Sacramento, 5-8 November 2006.
 W. Wieleba, “The Statistical Correlation of the Coefficient of Friction and Wear Rate of PTFE Composites,” Wear, Vol. 252, No. 9-10, 2002, pp. 719-729.
 M. A. Chowdhury and M. Helali, “The Effect of Relative Humidity and Roughness on the Friction Coefficient under Horizontal Vibration,” The Open Mechanical Engeering Journal, Vol. 2, 2008, pp. 128-135.
 P. Xing, B. Gao, Y. Zhuang, K. Liu and G. Tu, “On the Medication of Hypereutectic Al-Si Alloys Using Er,” Acta Metallurgica Sinica (English Letters), Vol. 23, No. 5, 2010, pp. 327-333.
 M. Gupta and S. Ling, “Microstructure and Mechanical Properties of Hyp/Hypereutectic Al-Si Alloys Synthesized Using a Near-Net Shape Forming Technique,” Journal of Alloys and Compounds, Vol. 287, No. 1-2, 1999, pp. 284- 294. doi:10.1016/S0925-8388(99)00062-6
 Y. Y. Li. D. Zhang, T. L. Ngat and W. Zhang, “Rapidly-solidified Hypereutectic Al-Sialloys Prepared by Powder Extrusion,” Transactions of Nonferrous Metals Society of China, Vol. 12, No. 5, 2002, pp. 878-881.