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

Application of uniform design in optimisation of three stage ageing of Al-Cu-Mg alloys
Application of uniform design in optimisation of three stage ageing of Al-Cu-Mg alloys
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 25C shows more beneficial effect than ageing at 65C. The hardness increase in Stage I and Stage III ageing is closely related to the S phase content.
heat treatment, aluminium alloys
0022-2461
4398-4405
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d

Gao, N., Starink, M.J., Kamp, N. and Sinclair, I. (2007) Application of uniform design in optimisation of three stage ageing of Al-Cu-Mg alloys. Journal of Materials Science, 42, 4398-4405.

Record type: 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 25C shows more beneficial effect than ageing at 65C. The hardness increase in Stage I and Stage III ageing is closely related to the S phase content.

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Published date: 2007
Keywords: heat treatment, aluminium alloys

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Local EPrints ID: 43166
URI: http://eprints.soton.ac.uk/id/eprint/43166
ISSN: 0022-2461
PURE UUID: 2007be64-f782-4cde-8d2b-07b87ac4a85b

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Date deposited: 12 Jan 2007
Last modified: 09 Dec 2019 19:06

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