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Journal of Materials Science

, Volume 42, Issue 12, pp 4398–4405 | Cite as

Application of uniform design in optimisation of three stage ageing of Al–Cu–Mg alloys

  • N. GaoEmail author
  • M. J. Starink
  • N. Kamp
  • I. Sinclair
Article

Abstract

The hardness variations and precipitation behaviour during the three-stage ageing of three Al–Cu–Mg alloys were investigated using micro-hardness testing and differential scanning calorimetry (DSC). To facilitate the determination of an optimised heat treatment, a uniform design method was employed by which the influences of three-stage interrupted ageing on the hardness and precipitation can be elucidated with a limited number of experiments. It is found that optimised heat treatment with maximum hardness can be achieved for non-stretched materials by applying the method of three-stage ageing, but there is no obvious effect for stretched T351 materials. A long initial Stage I and a suitable Stage II ageing time are beneficial for hardness, and the Stage II ageing at 25 °C shows more beneficial effect than ageing at 65 °C. The hardness increase in Stage I and Stage III ageing is closely related to the S phase content.

Keywords

Differential Scanning Calorimetry Ageing Time Differential Scanning Calorimetry Curve Uniform Design Fatigue Crack Growth Resistance 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Materials Research Group, School of Engineering SciencesUniversity of SouthamptonSouthamptonUK
  2. 2.Manchester Materials Science CentreUMISTManchesterUK

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