4.7 Article

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

期刊

SCRIPTA MATERIALIA
卷 218, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114804

关键词

Brass; Superplasticity; Grain boundary sliding; Twinning; Dynamic recrystallization

资金

  1. European Research Council under ERC [267464-SPDMETALS]
  2. Ministry of Science and Higher Education of RF [0718-2020-0030, 075-15-2021-696]

向作者/读者索取更多资源

During superplastic deformation of microduplex-structured brasses, strain primarily occurs in the beta-phase through grain boundary sliding and dislocation slip/creep mechanisms. Dynamic recrystallization and twinning transform the initial coarse beta-phase grains into ultrafine grains, and alloying with Al improves superplastic behavior and reduces residual cavitation.
During superplastic deformation of microduplex-structured brasses, the strain is primarily localized in the beta-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. beta-phase leading to a transformation of the initial coarse beta-phase grains with average sizes of -4-5 mu m to ultrafine grains with sizes below 1 mu m. Alloying with Al refined the beta-grains, improved the superplastic behavior and reduced the occurrence of residual cavitation.

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