Bimodal Microstructure and Mechanical Properties of Cryomilled Nanocrystalline Al-7.5Mg Academic Article

abstract

• ABSTRACTThe 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.

authors

• Lavernia Borrego, Enrique

published proceedings

• MRS Advances

author list (cited authors)

• Lee, Z., Witkin, D. B., Lavernia, E. J., & Nutt, S. R.

complete list of authors

• Lee, Zonghoon||Witkin, David B||Lavernia, Enrique J||Nutt, Steven R

publication date

• 2002

publisher

• Springer Nature  Publisher

published in

• MRS Advances  Journal

keywords

• 34 Chemical Sciences
• 3403 Macromolecular And Materials Chemistry
• 40 Engineering
• 4016 Materials Engineering

Digital Object Identifier (DOI)

• 10.1557/proc-740-i1.7

start page

• i1.7

volume

• 740

URL

• http://dx.doi.org/10.1557/proc-740-i1.7