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Development of Ultrafine Grain Structure in an Al–Mg–Mn–Sc–Zr Alloy During High-Temperature Multidirectional Isothermal Forging

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Abstract

Mechanisms of grain refinement under multidirectional isothermal forging (MIF) at 325 °C (~ 0.65 Tm) and the strain rate 10− 4 s− 1 of the Al–Mg-based alloy with complex additions of transition metals were investigated. The starting alloy had an equiaxed grain structure with grain size 25 µm and a uniform distribution of coherent Al3(Sc,Zr) dispersoids of 20–50 nm. A distinguished structural feature in the early MIF stage was the formation of high strain- and misorientation gradients, followed by deformation banding. Due to the sequential changes of the loading axis, such bands were developed in various directions and fragmented the original grains. The number of bands and misorientation of their boundaries gradually rose with strain, resulting in formation of (ultra)fine grain structure with the grain size 2 µm. New grain formation was concluded to occur via continuous dynamic recrystallization and controlled by the nanosized precipitates, which preferably remained stable and coherent with the surrounding matrix.

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Acknowledgements

The work was supported by the Russian Science Foundation under Grant No. 16-19-10152-P and the Ministry of Science and Higher Education of Russia in accordance to the state assignment of IMSP RAS under Grant АААА-А19-119021390107-8 (composition analyses of intermetallic phases). The authors are grateful to Dr. M. Shagiev for the useful discussions and Mr. B. Atanov for help in experimental work.

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  1. Laboratory of Light Alloys, Institute for Metals Superplasticity Problems of Russian Academy of Science, Khalturin St. 39, Ufa, Russia, 450001

    O. Sitdikov, E. Avtokratova & M. Markushev

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  1. O. Sitdikov
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  2. E. Avtokratova
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  3. M. Markushev
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Sitdikov, O., Avtokratova, E. & Markushev, M. Development of Ultrafine Grain Structure in an Al–Mg–Mn–Sc–Zr Alloy During High-Temperature Multidirectional Isothermal Forging. Met. Mater. Int. 27, 2743–2755 (2021). https://doi.org/10.1007/s12540-020-00842-2

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