Formation of ultrafine grains and twins in the β-phase during superplastic deformation of two-phase brasses

Mikhaylovskaya, Anastasia, Yakovtseva, Olga, Tabachkova, Natalia and Langdon, Terence G. (2022) Formation of ultrafine grains and twins in the β-phase during superplastic deformation of two-phase brasses. Scripta Materialia, 218, [114804]. (doi:10.1016/j.scriptamat.2022.114804).

Record type: Article

Abstract

During superplastic deformation of microduplex-structured brasses, the strain is primarily localized in the β-phase where deformation occurs by grain boundary sliding (GBS) and dislocation slip/creep mechanisms. Dynamic recrystallization and twinning were observed in the b.c.c. β-phase leading to a transformation of the initial coarse β-phase grains with average sizes of ~4-5 µm to ultrafine grains with sizes below 1 µm. Alloying with Al refined the β-grains, improved the superplastic behavior and reduced the occurrence of residual cavitation.

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Accepted/In Press date: 8 May 2022

e-pub ahead of print date: 19 May 2022

Published date: September 2022

Additional Information: Funding Information: One of the authors was supported by the European Research Council under ERC Grant Agreement No. 267464 -SPDMETALS (TGL). Several authors were supported by Ministry of Science and Higher Education of RF in a framework of State Task to Universities Project No. 0718-2020-0030 (MAV and OAY). TEM was studied in a Collective Using Center of NUST MISIS “Material Science and Metallurgy” supported by Ministry of Science and Higher Education of RF Project No. 075-15-2021-696 (NYuT). Publisher Copyright: © 2022 Acta Materialia Inc.

Keywords: brass; deformation mechanisms; grain boundary sliding; superplasticity; twinning, Superplasticity, Brass, Grain boundary sliding, Twinning, Dynamic recrystallization