High strength ultrafine/nanostructured aluminum produced by back pressure equal channel angular processing

W. Xu*, T. Honma, X. Wu, S. P. Ringer, K. Xia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

High strength ultrafine/nanograined aluminum materials with ultimate strength up to 740 MPa and Vickers microhardness up to 2285 MPa were produced using back pressure equal channel angular processing of ultrafine-sized aluminum powder at 400 °C. Microstructure analyses revealed that the attained high strength and microhardness were derived from the presence of nanosized aluminum and γ -alumina grains (5-10 nm) as well as residual amorphous alumina. The interaction between the severe shear deformation and the preexisting amorphous alumina, concurrent oxidation, and amorphous to γ -alumina transition was considered to be responsible for the formation of such a refined and complex nanostructure.

Original languageEnglish
Article number031901
Pages (from-to)031901-1-031901-3
Number of pages3
JournalApplied Physics Letters
Volume91
Issue number3
DOIs
Publication statusPublished - 2007
Externally publishedYes

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