Grain boundary evolution of highly nanotwinned alloys: Effect of initial twinned microstructure

SCRIPTA MATERIALIA

卷:190

Article

Bahena, Joel A.¹  Juarez, Theresa¹  Velasco, Leonardo²  Hodge, Andrea M.^1,3 

[1] Univ Southern Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

[2] Karlsruhe Inst Technol, Inst Nanotechnol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[3] Univ Southern Calif, Dept Chem Engn & Mat Sci, 925 Bloom Walk,HED 216, Los Angeles, CA 90089 USA

关键词: Twinning;    Microstructural evolution;    Grain growth;    Nanostructured materials;   

DOI  :  10.1016/j.scriptamat.2020.08.024

来源: Elsevier

【 摘 要 】

The effects of initial twinned microstructure on the grain growth behavior of four sputtered nanotwinned copper alloys were compared. As-deposited films were characterized by transmission electron microscopy and the microstructural evolution of the annealed samples was investigated through electron backscatter diffraction. Texture showed a pronounced effect, where films with strong {111} textures exhibited abnormal grain growth that was not observed in a randomly textured film. Additionally, the stability induced by twin boundaries appears to be limited, as the excess energy generated by a large twin density could drive the early onset of abnormal grain growth and recrystallization. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free