Evolution of Morphology and Microstructure in Electrodeposited Nanocrystalline Al–Mg Alloy Dendrites

Metals

Sankara Sarma V. Tatiparti¹ 

关键词: Al–Mg;    nanocrystalline;    dendrites;    morphology;    microstructure;   

DOI  :  10.3390/met1010003

来源: mdpi

【 摘 要 】

Nanocrystalline Al–Mg dendrites were fabricated through galvanostatic electrodeposition. Initially feather-like morphology was formed exhibiting morphological evolution to smooth globules at its tips. With eventual deposition, rough globules formed over the smooth ones. The feather-like and smooth globules possessed supersaturated face centered cubic (fcc)–Al(Mg) phase with ∼7 and ∼20 at.% Mg respectively. The rough globules contained hexagonal close packed (hcp)–Mg(Al) phase with ∼80 at.% Mg. Microstructural examinations revealed that the feather-like and rough globules possessed grain sizes of ∼42 ± 15 and ∼36 ± 12 nm respectively. The region, which exhibited morphological evolution from feather-like to smooth globules, possessed ∼16 ± 7 nm grain size. The observed microstructural and compositional features were attributed to the local current density values. The formation of the Al–Mg dendrites is discussed in this paper.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.