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Ultrafine-grained structure produced by FSW and ECAP in Al-Mg-Sc-Zr alloy: Comparison

V. Kulitskiy, S. Malopheyev, Y. Buranova, S. Divinski, G. Wilde, R. Kaibyshev

Materials Science Forum, 838, 379-384, (2016)

DOI: 10.4028/www.scientific.net/MSF.838-839.379

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The Al-5.4Mg-0.2Sc-0.1Zr alloy with initial coarse grained structure and containing coherent nanoscale Al3(Sc,Zr) particles with an average size of ~9 nm was subjected to equal channel angular pressing (ECAP) at temperatures ranging from 300 to 450°C up to a total strain of ~12 and friction stir processing (FSP) with the rotation speed ranging from 350 to 800 rpm. ECAP led to the formation of a uniform microstructure with an average grain size of ~ 0.9 μm. Increasing deformation temperature leads to a slight increase in the average grain size to 1.4 μm and coarsening of Al3(Sc,Zr) precipitates to 13 nm. FSP with a tool rotation speed of 350, 500, 650, 800 rpm and traveling speed of 75 mm/min led to the formation of fully recrystallized uniform microstructures with an average grain size of ~1.6, 1.9, 2.7 and 2.9 μm, respectively. The coarsening of Al3(Sc,Zr) dispersoids from 9 to 27 nm occurred under FSP but most of them retained coherency with the matrix.

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{"type":"inproceedings", "name":"v.kulitskiy20161", "author":"V. Kulitskiy and S. Malopheyev and Y. Buranova and S. Divinski and G. Wilde and R. Kaibyshev", "title":"Ultrafinegrained structure produced by FSW and ECAP in AlMgScZr alloy: Comparison", "journal":"Materials Science Forum", "volume":"838", "OPTnumber":"", "OPTmonth":"1", "year":"2016", "OPTpages":"379-384", "OPTnote":"", "OPTkey":"Aluminium alloy; equal channel angular pressing; friction stir welding; ultrafine grained microstructure", "DOI":"10.4028/www.scientific.net/MSF.838-839.379"}
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