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Structural and mechanical properties of friction stir welded Al2O3 and SiC reinforced Al 7075 alloys


Al 7075 of 4 mm thickness plates were welded by using ceramic particles of micron size. Different revolution speed, ranging from 1600 to 2000 RPM and transverse speed of 17 to 35 mm/min were applied. The sound weld is achieved at revolution speed of 1600 RPM and transverse speed of 17 mm/min. In this work, ceramic particles of Al2O3 and SiC were used to reduce the effect of the heat towards the base material during friction stir welding owing to their high friction coefficient and reasonable thermal conductivity and to enhance mechanical properties. Vickers microhardness test was performed on the plain, Al2O3, and SiC mixed Al 7075 welded samples. This test showed the welded joint by using Al2O3 and SiC have 10 to 12 % increase in hardness than that of the joint without using particles. Tensile strength of welded joints without ceramics particles showed improved results. Dispersion of ceramics particles was examined by metallurgical microscope. Scanning electron microscope (SEM) images and fracture analysis of the stir welded zone and base materials were observed. The structural-property relationship of plain, Al2O3, and SiC mixed Al 7075 welded samples was discussed systematically and found that improvement in hardness for Al2O3, and SiC mixed Al 7075 welded samples was due to the higher thermal conductivities of added ceramic particles and precipitation strengthening mechanism. While, reduction in tensile strength ascribed to the formation of intermetallic compounds.

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Al2O3 :

Aluminum oxide


Silicon carbide


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This project was supported by the Deanship of Scientific Research at Prince Sattam Bin Abdulaziz University under the research project No. 2020/01/17063.

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Corresponding author

Correspondence to Hussein Alrobei.

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Recommended by Editor Chongdu Cho

Rizwan Ahmed Malik is currently working as an Assistant Professor in University of Engineering and Technology, Taxila, Pakistan. Previously, he worked as Research Professor at School of Advanced Materials Engineering, Changwon National University, Republic of Korea. He also worked as a Postdoctoral researcher at School of Advanced Materials Engineering, Changwon National University, Republic of Korea. He got his Ph.D. in Nano and Advanced Materials Engineering from Changwon National University, Republic of Korea and M.S. in Material Science and Engineering from University of Ulsan, Republic of Korea. He received his B.S. in Metallurgy and Materials Engineering, University of the Punjab, Pakistan. His principal field of interest is processing, characterization, and applications of functional materials for actuator, sensors and energy harvesting applications. He has published over 60 papers in peer-reviewed international journals with around 950 google scholar citations.

Hussein Alrobei received a M.S. degree in Mechanical Engineering in 2014 from University of South Florida, United State. He received Ph.D. degree in Mechanical Engineering at University of South Florida, United State from 2015–2018. Currently, he is working as an Assistant Professor in Mechanical Engineering Department, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia. His research interests include composite materials, mechanical, physical and photoelectrochemical properties of molybdenum disulfide alpha-hematite nanocomposite films.

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Shafique, J., Alrobei, H., Wakeel, A. et al. Structural and mechanical properties of friction stir welded Al2O3 and SiC reinforced Al 7075 alloys. J Mech Sci Technol 35, 1437–1444 (2021).

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  • Metallographic analysis
  • Microscopic
  • SEM
  • Tensile testing
  • Welded zone