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HomeMaterials Science ForumMaterials Science Forum Vols. 838-839Microtextural Changes and Superplasticity in an...

Microtextural Changes and Superplasticity in an Al-7075 Alloy Processed by High-Pressure Torsion

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Abstract:

The influence of High-Pressure Torsion (HPT) on texture and superplasticity in an Al-7075 was studied using X-ray diffraction and tensile testing. The alloy was processed by HPT at room temperature under a pressure of 6.0 GPA up to a maximum of 20 turns. The pole figures were measured at mid-radius of the disks after 1, 5, 10 and 20 turns. The results show the presence of a typical torsion texture during HPT, in particular, the C{001}<110> component was found to develop preferentially. With increasing deformation, the A {111}<110> and the C components are reinforced after 5 turns and the texture tends to be random with the presence of a fibre texture near the center. Moreover, the fraction of C components tends to gradually decrease and a fairly isotropic microtexture is apparent after 20 turns. Tensile testing showed the development of excellent superplastic properties in this alloy with elongations up to ~700% when testing at a temperature of 623 K.

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Periodical:

Materials Science Forum (Volumes 838-839)

Pages:

445-450

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.838-839.445

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Online since:

January 2016

Authors:

Aicha Loucif*, Yi Huang, Anne Laure Helbert, Thierry Baudin, Shima Sabbaghianrad, Terence G. Langdon

Keywords:

Al-7075 Alloy, High-Pressure Torsion, Microtexture, Superplasticity, Ultrafine-Grained Materials

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* - Corresponding Author

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