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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 922Effect of Strain Hardening on the Joint Efficiency...

Effect of Strain Hardening on the Joint Efficiency of an Al-Mg-Sc-Zr Alloy Subjected to Friction Stir Welding

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Abstract:

The microstructure and mechanical properties of friction stir welded Al-5.4Mg-0.2Sc-0.1Zr alloy were studied. Defect-free welds were produced in hot extruded, hot rolled and cold rolled initial conditions. Friction stir welding led to the formation of ultrafine-grained structure in stir zone that contributes to overall strengthening. Coherent Al₃(Sc,Zr) dispersoids retain partially during welding process that provides a joint efficiency close to 100% in the hot extruded and hot rolled materials. In the cold-rolled state the joint efficiency was found to be only 64%. The relatively low weld strength of the cold rolled material was attributed to the elimination of strain hardening due to the formation of recrystallized structure. It was shown that full strength weld can be achieved in semi-finished products of Al-Mg-Sc alloys in cold-worked and stabilized states being equal to H323 and H341 tempering by friction stir welding.

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Periodical:

Advanced Materials Research (Volume 922)

Pages:

463-468

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.922.463

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Online since:

May 2014

Authors:

Sergey Malopheyev*, Vladislav Kulitskiy, Sergey Mironov, Daria Zhemchuzhnikova, Rustam Kaibyshev

Keywords:

Aluminium Alloy, Deformation Structure, Friction Stir Welding (FSW), THERMOMECHANICAL PROCESSING, Ultrafine Grained Microstructure

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