Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Strain Rate and Pre-strain on Tensile Properties of Heat-treated A5082 and A6060 Aluminium Wrought Alloys

열처리한 A5082와 A6060합금의 인장특성에 미치는 변형율속도 및 예비변형율의 영향

  • Lee, Choongdo (Dept. of Metallurgical & Materials Engineering, Inha Technical College)
  • 이충도 (인하공업전문대학 금속재료과)
  • Received : 2020.05.27
  • Accepted : 2020.06.16
  • Published : 2020.07.30
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Abstract

The tensile property of A5082 and A6060 aluminium wrought alloys was investigated, in terms of the strain rate sensitivity on alloy conditions by heat treatment and bake hardenability on pre-strain prior to strain ageing. The tensile test was carried out in a range of strain rate of 4.17 × 10-5 s-1 ~ 4.17 × 10-5 s-1 in room temperature and the nominal range of pre-strain was 3.0 ~ 10.5%. The tensile deformation of A5082 alloys is characterized as typical case of dynamic strain ageing with negative strain rate sensitivity for all conditions, and the tensile strength indicates a similar level regardless of alloy conditions, except only in full annealed condition. The stress-relief annealing on A6060 alloys can induce practical decrease in strength level of over approximately 100 MPa without any ductility loss, compared to as-rolled condition, while a full annealed and aged condition leads remarkable strengthening effect with the decrease of tensile elongation. Additionally, the bake hardenability of A5082 alloy by strain ageing indicates a negative dependence upon the increase of pre-strain, while A6060 alloy exhibits a positive sign even in low level relatively compared with conventional SPCC.

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References

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