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Investigating the Possibility of Elimination of Nickel and Replacement of Copper and Silicon Instead of that in A336 Casting Alloy Used in Automotive Pistons

Ghasemali, Mojtaba | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49083 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Varahram, Naser
  7. Abstract:
  8. In this research the effect of Si, Cu and Ni alloying elements on the structure and mechanical properties of the A336 alloy is investigated. Expriments were done in two situations, casting and heat treated and the results for all samples with different amount of alloying elements are compared and the effect of heat treating is also investigated. Results show that with increasing the amount of Si and Cu and decreasing the amount of Ni strength and hardness of the cast alloy are 134 MPa and 65 HB and they increase to 187 MPa and 89 HB in heat treated alloy. The elongation and coefficient of linear expansion are decreased from 2.3% and 21.94 μm/m.K to 1.1% and 21.62 μm/m.K. Also the T6 heat treating increases the strength and hardness of the alloy comparing to cast alloy. For example in alloy A336, strength and hardness are increased from 134 MPa and 65 HB in cast alloy to 243 MPa and 103 HB in heat treated alloy and the elongation is decreased from 2.3% to 0.9%. Also it is shown that adding Cu and Si, influences the secondry dendrite arm spacing and decreases SDAS. By increasing the amount of Si and Cu from 11 and 0.74 percent to 13.7 and 3.3 percent, the SDAS decreases from 35.2 μm to 24.6 μm. Microstructural and phase composition studies are done by using SEM/EDS and optical microscope
  9. Keywords:
  10. T6 Heat Treatment ; Intermetallic Compounds ; Secondary Dendrite Arm Spacing (SDAS) ; Aluminum Alloy A336 ; Ultimate Tensile Strength ; Linear Expansion Coefficient

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