Tensile behavior of bulk nanocrystalline aluminum synthesized by hot extrusion of ball-milled powders

H. J. Choi; S. W. Lee; J. S. Park; D. H. Bae

doi:10.1016/j.scriptamat.2008.07.030

Tensile behavior of bulk nanocrystalline aluminum synthesized by hot extrusion of ball-milled powders

H. J. Choi, S. W. Lee, J. S. Park, D. H. Bae

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

54 Citations (Scopus)

Abstract

The deformation behavior of bulk nanocrystalline aluminum down to 48 nm in grain size, produced by hot extrusion of ball-milled powders, has been evaluated by compression and tension tests. Isotropic yield stress increases following the Hall-Petch relationship with decreasing grain size down to 70 nm. However, a positive deviation in the relationship is found for grain sizes below 70 nm, and aluminum with a grain size of 48 nm exhibits a superior yield stress of 500 MPa with ductile failure.

Original language	English
Pages (from-to)	1123-1126
Number of pages	4
Journal	Scripta Materialia
Volume	59
Issue number	10
DOIs	https://doi.org/10.1016/j.scriptamat.2008.07.030
Publication status	Published - 2008 Nov

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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AB - The deformation behavior of bulk nanocrystalline aluminum down to 48 nm in grain size, produced by hot extrusion of ball-milled powders, has been evaluated by compression and tension tests. Isotropic yield stress increases following the Hall-Petch relationship with decreasing grain size down to 70 nm. However, a positive deviation in the relationship is found for grain sizes below 70 nm, and aluminum with a grain size of 48 nm exhibits a superior yield stress of 500 MPa with ductile failure.

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