Mechanical characterization of heat treated Al2219 hybrid composites

  • Gowrishankar M. C. Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
  • Sathyashankara Sharma Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
  • B. K. Pavan Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
  • Kamath Kiran Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
  • Kumar Rajendra Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
  • Pavan Hiremath Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
  • Manjunath Shettar Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India, 576104 Phone: 9740540928; Fax: 91-820-2571071
Keywords: Al 2219, Alumina, Stir casting, Age hardening, Tensile strength, Impact strength, SEM

Abstract

Aluminium alloy matrix composites with Al2O3 reinforcements exhibit superior mechanical properties and utilize in several demanding fields’ viz., automobile, aerospace, defense, sports equipment, electronics and bio-medical. The present work emphasizes on improvement of microstructure and mechanical properties of age hardened graphite and alumina reinforced Al alloy matrix hybrid composites. Different composites with a constant carbon content of 1 weight % and 0, 2, 4 and 6 weight % Al2O3 as reinforcements are fabricated by using stir casting technic and tested for hardness, tensile and impact strength. Scanning electron microscopy (SEM) is performed to analyse the failure mode under tensile load. All the composites are subjected to age hardening treatment with solutionising temperature of 530oC and aging temperatures of 100 and 200oC. The peak hardness of the composites at two aging temperatures are noted. Tensile and impact tests are conducted for the peak aged specimens.  Results show substantial increase in the hardness of the age hardened specimens in the range of 34-44% in comparison with the as cast specimens. Result analysis shows increase in tensile strength (upto 40%) and decrease in impact resistance (upto 33%) with the increase in weight % of reinforcements. As the aging temperature increases a reduction in tensile strength and impact resistance is observed in each composites.

Published
2019-03-28
How to Cite
M. C., G., Sharma, S., Pavan, B. K., Kiran, K., Rajendra, K., Hiremath, P., & Shettar, M. (2019). Mechanical characterization of heat treated Al2219 hybrid composites. Journal of Mechanical Engineering and Sciences, 13(1), 4380-4389. https://doi.org/10.15282/jmes.13.1.2019.03.0373