Grain boundary formation by remnant dislocations from the de-twinning of thin nano-twins. (15th April 2015)

• Record Type: Journal Article
• Authors: Cao, Y.; Wang, Y.B.; An, X.H.; Liao, X.Z.; Kawasaki, M.; Ringer, S.P.; Langdon, T.G.; Zhu, Y.T.
• Is Part Of: Scripta materialia. Volume 100(2015)
• Page Start: 98
• Page End: 101
• Publication Date: 2015-04-15
• Subjects: Grain boundary -- Twinning -- De-twinning -- Grain refinement -- Steel; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.01.001
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : We report a grain boundary formation mechanism in face-centred cubic metals with low stacking fault energies. Severe plastic deformation produces primary nano-twins with a twin boundary spacing of several nanometres, followed by secondary twinning through the activation of Shockley partial dislocations. The partial dislocations interact with primary twin boundaries, resulting in de-twinning of the primary twins and producing very high densities of sessile dislocations. The accumulation of these dislocations produces new grain boundaries with neighbouring grains having similar orientations.