The influence of Al3Zr precipitation on the superplastic behaviour of aluminium alloys

H.M. Flower; G.J. Boyle; R.J. Dashwood; R. Grimes

doi:10.4028/www.scientific.net/MSF.447-448.389

The influence of Al3Zr precipitation on the superplastic behaviour of aluminium alloys

H.M. Flower, G.J. Boyle, R.J. Dashwood, R. Grimes

Vice-Chancellor's Office

Research output: Contribution to journal › Article

Abstract

The development of a fine distribution of Al3Zr precipitates is essential to confer superplastic properties in a number of industrial and experimental aluminium alloys. In this paper the influence of a number of production variables on the development of the Al3Zr dispersions in both AA2004 and Al-4Mg-Zr alloys is investigated. Microsegregation leads to a heterogeneous distribution of supersaturated zirconium after solidification. Under certain processing conditions this can lead to the formation of precipitate free zones which are detrimental to SPF performance. An intermediate temperature hold (360°C) can strongly influence the final dispersion and in turn can reduce the detrimental effect of the precipitate free zones. Other key factors that influence the Al3Zr distribution (such as zirconium content, heating rate and hold times) are also discussed.

Original language	English
Pages (from-to)	389-394
Number of pages	6
Journal	Materials Science Forum
Volume	447-448
DOIs	https://doi.org/10.4028/www.scientific.net/MSF.447-448.389
Publication status	Published - 2004

Keywords

AA2004
Al-Cu Alloys
Al-Mg Alloys
Superplasticity
Supral
Zirconium

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Flower, H. M., Boyle, G. J., Dashwood, R. J., & Grimes, R. (2004). The influence of Al3Zr precipitation on the superplastic behaviour of aluminium alloys. Materials Science Forum, 447-448, 389-394. https://doi.org/10.4028/www.scientific.net/MSF.447-448.389

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AB - The development of a fine distribution of Al3Zr precipitates is essential to confer superplastic properties in a number of industrial and experimental aluminium alloys. In this paper the influence of a number of production variables on the development of the Al3Zr dispersions in both AA2004 and Al-4Mg-Zr alloys is investigated. Microsegregation leads to a heterogeneous distribution of supersaturated zirconium after solidification. Under certain processing conditions this can lead to the formation of precipitate free zones which are detrimental to SPF performance. An intermediate temperature hold (360°C) can strongly influence the final dispersion and in turn can reduce the detrimental effect of the precipitate free zones. Other key factors that influence the Al3Zr distribution (such as zirconium content, heating rate and hold times) are also discussed.

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