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

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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.

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Author notes

  1. N. Kamp

    Present address: Manchester Materials Science Centre, UMIST, Manchester, M1 7HS, UK

Authors and Affiliations

  1. Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, UK

    N. Gao, M. J. Starink, N. Kamp & I. Sinclair

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  1. N. Gao
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  2. M. J. Starink
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  3. N. Kamp
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  4. I. Sinclair
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Correspondence to N. Gao.

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Gao, N., Starink, M.J., Kamp, N. et al. Application of uniform design in optimisation of three stage ageing of Al–Cu–Mg alloys. J Mater Sci 42, 4398–4405 (2007). https://doi.org/10.1007/s10853-006-0659-6

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  • DOI: https://doi.org/10.1007/s10853-006-0659-6

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