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Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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Bimodal microstructure and deformation of cryomilled bulk nanocrystalline Al-7.5Mg alloy

Cited 43 times inthomson ciCited 31 times inthomson ci
Title
Bimodal microstructure and deformation of cryomilled bulk nanocrystalline Al-7.5Mg alloy
Author
Lee, ZonghoonWitkin, DBRadmilovic, VLavernia, EJNutt, SR
Keywords
nanocrystalline; bimodal; cryomilling; aluminum; deformation
Issue Date
2005-11
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.410-411, no., pp.462 - 467
Abstract
The microstructure, mechanical properties and deformation response of bimodal structured nanocrystalline Al-7.5Mg alloy were investigated. Grain refinement was achieved by cryomilling of atomized Al-7.5Mg powders, and then cryomilled nanocrystalline powders blended with 15 and 30% unmilled coarse-grained powders were consolidated by hot isostatic pressing followed by extrusion to produce bulk nanocrystalline alloys. Bimodal bulk nanocrystalline Al-7.5Mg alloys, which were comprised of nanocrystalline grains separated by coarse-grain regions, show balanced mechanical properties of enhanced yield and ultimate strength and reasonable ductility and toughness compared to comparable conventional alloys and nanocrystalline metals. The investigation of tensile and hardness test suggests unusual deformation mechanisms and interactions between ductile coarse-grain bands and nanocrystalline regions.
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DOI
10.1016/j.msea.2005.08.104
ISSN
0921-5093
Appears in Collections:
MSE_Journal Papers
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