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Ourang, Mohammad Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41305 (07)
  4. University: Sharif University of Technology
  5. Department: Materials science and Engineering
  6. Advisor(s): Ekrami, Ali Akbar; Seyed Reihani, Morteza
  7. Abstract:
  8. In this research, wear behaviors of 6061Al and 6061Al-20 vol% SiC composite -prepared by powder metallurgy method- were investigated in the temperature range 25- 200°C. Dry sliding wear tests were conducted at a constant sliding velocity of 0.34 m/s, an applied load of 20 N and 50N, and a sliding distance of 2450m using a pin-on-disc machine test. Some of the wear tests were carried out with artificially aged specimens in order to determine the aging effects on wear rate of composite. Worn surfaces and wear debris were also examined by using SEM and EDS techniques. Also for determining the effect of age hardening treatment on wear behavior of composite, specimens were solution treated at 529°c for 2,3 and 4 h, water-quenched then aged at 170 °C for 2, 3and 4 h. in order to obtain the optimum solution time. Results showed for composite and unreinforced 6061 alloy at a normal load of 2kgf, the wear rate slightly decreased, except at 50°c that the wear rate significantly increased. The wear rate of composite was higher than unreinforced alloy at 2kgf. With Increase of normal load to 5kgf, the wear rate slightly increased, except in 50°c that the wear rate significantly decreased. Analysis of worn surfaces indicated that dominant wear mechanism of the unreinforced alloy specimens were adhesive and for composites were cutting mechanism. the optimum time for solution treatment was 3 h, because of obtaining higher hardness and faster aging kinetic. The wear tests showed that the aging treatment improved the wear resistance of composites, for all temperatures
  9. Keywords:
  10. Aluminum Matrix Composite ; High Temperature Wear ; Age Hardening ; Powder Metallurgy

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