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The Effect of Cooling Rate and Heat Treatment on An Al-4.5% Cu Alloy

Mohammadi, Hesam | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52220 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Varahram, Naser
  7. Abstract:
  8. Al-4.5% Cu alloy, an age-hardenable alloy, is an important alloy in industry due to such unique characteristics as high strength-to-weight ratio and considerable strength at elevated temperatures. In this study, the aim was to evaluate the combined effect of cooling rate and heat treatment on an A206 alloy having more impurities—especially iron—than the nominal specifications. To this end, the melt was poured in a five-step mold. Afterwards, each step was subjected to T4 and T6 treatments in order to study the changes compared to the as-cast samples. Ultimate tensile strength, yield strength, elongation, and grain size were determined by using tensile tests and optical microscopy, respectively. The results demonstrated that heat treatment can improve the tensile strength, and that the tensile strength is higher in T6-treated alloys than it is in T4-treated ones. However, in both conditions, the 7% elongation required in automotive industries is attainable. In the as-cast structure, tensile properties and grain size were strongly affected by cooling rate. On the other hand, tensile properties and grain size were not affected substantially by cooling rate after they were subjected to either natural or artificial aging
  9. Keywords:
  10. Aging ; Cooling Rate ; Heat Treatment ; Step-Die ; Elongation ; Tensile Strength

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