Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 15, Pages 3349-3357Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.02.036
Keywords
Nanocrystalline 6061 aluminum; Shock compaction; Powder compaction
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Funding
- Sandia National Laboratories
- United States Department of Energy [DE-AC04-94AL85000]
- DTRA [HDTRA1-07-1-0018]
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Fully and partially nanocrystalline aluminum alloy powders made by cryomilling and plane-strain machining are dynamically consolidated into bulk compacts using a three-capsule gas-gun compaction geometry. Compacts with 98-99% theoretical mass density are produced, while retaining unique features of their initial microstructures. The microstructure of the fully nanocrystalline cryomilled powder compacts consists of 50-150 nm-thick elongated laths and 10-50 nm equiaxed grains. Partially nanocrystalline plane-strain machined powder compacts retain their bimodal microstructure composed of nanoscale grains near the particle surfaces and larger microscale grains with high dislocation densities in the particle interior. In this paper, the powder processing and compaction approach, and their effects on the physical, microstructural, and mechanical properties of the final compacts are described. (C) 2010 Elsevier B.V. All rights reserved.
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