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Electron Backscattered Diffraction of Aluminium Alloy 7075 Samples after Heat Treatment

By G. Vaneetveld, A. Rassili, J-C. Pierret, J. Lecomte-Beckers and Helen V. Atkinson

Abstract

This paper was presented at the 12th International ESAFORM Conference on Material Forming, Twente, The Netherlands, April 27-29 2009, and published in the Proceedings.The RAP process (Recrystallisation And Partial melting) is a reheating route used to give shear-thinning and thixotropic behaviour to a billet of semi-solid material. This process uses the recrystallisation phenomenon to obtain globular solid grains surrounded by a liquid matrix. Recrystallisation of rolled 7075 aluminium alloys in the T6 condition is difficult because dispersoid particles pin the grain boundaries. Here we examine with Electron Backscattered Diffraction the presence of intermetallic phases in the structure after reheating to various temperatures in the semi-solid range and quenching. The presence of these particles could explain some of the microstructural behaviour at semisolid temperatures. In addition, EBSD is used to examine whether recrystallisation has occurred

Topics: RAP, Thixoforming, 7075 Aluminium Alloys, Recrystallisation, Intermetallic particle, Pinning Force, Semi-solid
Publisher: ESAFORM (European Scientific Association For Material Forming)
Year: 2009
OAI identifier: oai:lra.le.ac.uk:2381/8773

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