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Microstructure evolution and mechanical properties of backward thixoextruded 7075 aluminum alloy

journal contribution
posted on 2012-04-01, 00:00 authored by M R Rokni, A Zarei-Hanzaki, H R Abedi, Nima Haghdadi
The present work deals with the microstructure evolution of 7075 aluminum alloy which has been backward thixoextruded in the temperature range of 550–600 °C using different ram diameters and ram displacement velocities. The recrystallization and partial melting (RAP) route has been used to obtain the semi-solid feedstocks for thixoforming. The results indicate that the back extruded microstructures mostly consist of semisolid grains which have been elongated along extrusion direction. The finest semisolid grain size has been obtained at lower deformation temperature and higher equivalent strain. This is attributed to the higher imposed shearing force on the liquid phase which could in turn fragment the grains. The current work also explores the room temperature mechanical properties of thixoformed work-pieces using shear punch testing method. It is found that the room temperature shear strength and ductility values have been substantially influenced by the deformation temperature, ram displacement velocity, and ram diameter.

History

Journal

Materials and design

Volume

36

Pagination

557 - 563

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0261-3069

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2011, Elsevier Ltd.

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