Study of texture and microstructure formation and anisotropy of properties of aluminum-lithium alloy 1420 sheets when rolling
https://doi.org/10.17073/0021-3438-2017-6-45-52
Abstract
The article shows the evolution of the crystallographic texture and anisotropy of properties during the cold rolling of Al–Mg–Li aluminum-lithium alloy 1420 sheets. Hot-rolled 1420 alloy billets were rolled in a cold condition with intermediate quenching under the following schedule: 7,3 mm → 4,8 mm → 3,0 mm → 1,8 mm. After each pass samples are taken for mechanical testing and structure analysis using optical microscopy and diffractometry. Sheets in all the analyzed conditions characterize by a deformed fiber structure and a considerable anisotropy of mechanical properties. Maximum ductility is observed at 45° to the rolling direction. The nature of anisotropy formed during hot rolling does not change during the cold rolling process. Sheets made of 1420 alloy maintain non-recrystallized structures and have a sharp deformation texture at all stages of rolling. Thus, pole figure and preferred orientation analysis revealed an increase in the volume ratio of rolling textures (slow for brass type and fast for S type) with the growing total cold rolling deformation. Recrystallization textures (R type) are present in small quantities only after hot rolling. The volume fraction of a textureless component decreases with the growth of deformation. The results obtained in the studies allow for the conclusion that first of all it is necessary to provide recrystallization in 1420 alloy sheets at the stage of hot rolling and obtain a recrystallized hot rolled billet for subsequent cold rolling in order to reduce the volume fraction of deformation texture and anisotropy of properties.
About the Authors
F. V. Grechnikov
Samara Scientific Center RAS
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Acad. of Russian Academy of Sciences, First deputy chairman of the Samara Scientific Center RAS
443001, Russia, Samara, Studencheskiy per., 3А
Ya. A. Erisov
Samara University
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Senior engineer of NIL-37, Samara University
443086, Russia, Samara, Moskovskoe shosse, 34
S. V. Surudin
Samara University
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Engineer, Department of metal forming processes, Samara University.
443086, Russia, Samara, Moskovskoe shosse, 34
M. S. Oglodkov
All-Russia Institute of Aviation Materials
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Senior researcher, All-Russia Institute of Aviation Materials
105005, Russia, Moscow, Radio str., 17
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Review
For citations:
Grechnikov F.V., Erisov Ya.A., Surudin S.V., Oglodkov M.S. Study of texture and microstructure formation and anisotropy of properties of aluminum-lithium alloy 1420 sheets when rolling. Izvestiya. Non-Ferrous Metallurgy. 2017;(6):45-52. (In Russ.) https://doi.org/10.17073/0021-3438-2017-6-45-52
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