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Investigation of the Effect of Temperature on Wear Behavior of 2024Al and 2024Al-20vol.%SiCp Composite

Mousavi Abarghouie, Mohammad Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40383 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Seyyed Reihani, Morteza
  7. Abstract:
  8. In this research, friction and wear behaviors of 2024 Al and 2024 Al-20 vol.% SiC composite -prepared by powder metallurgy method- were investigated in the temperature range 20- 250°C. Dry sliding wear tests were conducted at a constant sliding velocity of 0.5 m/s, an applied load of 20 N, and a sliding distance of 2500m using a pin-on-disc apparatus. Some of the wear tests were carried out with artificially aged specimens in order to determine the aging effects. Worn surfaces and wear debris were also examined by using SEM, EDS and XRD techniques. All specimens showed a transition from mild to severe wear above a critical temperature. In the mild wear regime, the wear rate and the friction coefficient of the composite specimens were higher than those of the unreinforced alloy. The SiC particles led to an increase in the critical transition temperature (about 75°C) and in the severe wear regime, they caused a considerable improvement in the wear resistance. It was also observed that aged specimens indicated higher wear rate than non-aged specimens below 150 and 125°C for the unreinforced alloy and the composite specimens, respectively. However, the non-aged specimens showed higher wear rate than the aged specimens above the mentioned temperatures. Analysis of worn surfaces and wear debris indicated that dominant wear mechanisms of the unreinforced alloy specimens were microploughing and slight adhesion in the mild wear regime, whereas the composite specimens showed microcutting and oxidation mechanisms in the same regime. The dominant wear mechanisms shifted to severe adhesion for all specimens in the severe wear regime
  9. Keywords:
  10. Aluminum Matrix Composite ; Age Hardening ; Wear ; High Temperature ; Powder Metallurgy

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