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Lee, Zonghoon
Atomic-Scale Electron Microscopy Lab.
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Bimodal microstructure and mechanical properties of cryomilled nanocrystalline Al-7.5Mg

Author(s)
Lee, ZonghoonWitkin, D.B.Lavernia, E.J.Nutt, S.R.
Issued Date
2002-12-03
URI
https://scholarworks.unist.ac.kr/handle/201301/52218
Citation
MRS 2002 Fall Meeting, v.740, pp.21 - 26
Abstract
The microstructure and mechanical properties consisting of tensile behavior and hardness of bulk nanocrystalline Al-7.5Mg alloy were investigated. Grain refinement was achieved by cryomilling of atomized Al-7.5Mg powders, and then nanocrystalline powders blended with 15% and 30% coarse-grained Al-7.5Mg powders were consolidated by hot isostatic pressing (HIP) followed by extrusion to produce bulk nanocrystalline Al-7.5Mg alloys. Bimodal structures, which enhance ductility and toughness of nanocrystalline metals, were produced that consisted of nanocrystalline grains and elongated coarse-grain bands. Examination of indentation revealed unusual deformation mechanisms and interactions between the coarse-grain bands and nanocrystalline regions. The ductile coarse-grain bands underwent extensive plastic deformation near indentation, while nanocrystalline regions exhibited limited deformation.
Publisher
Materials Research Society

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