Mechanical processing, compaction, and thermal processing of α-Fe powder

High-energy ball milling is a proven technique for both mechanical alloying and for the production of nanocrystalline powders. In this U.S. Bureau of Mines study, it is found that mechanical processing pure α-Fe powders in a nitrogen environment results in nanocrystalline powders with nitrogen conce...

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Bibliographic Details
Published in:Nanostructured materials 1994, Vol.4 (6), p.631-644
Main Authors: Dogan, C.P., Rawers, J.C., Govier, R.D., Korth, G.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Metal powders
Metals. Metallurgy
Physics
Powder metallurgy. Composite materials
Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
Production techniques
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Summary:High-energy ball milling is a proven technique for both mechanical alloying and for the production of nanocrystalline powders. In this U.S. Bureau of Mines study, it is found that mechanical processing pure α-Fe powders in a nitrogen environment results in nanocrystalline powders with nitrogen concentrations that increase linearly with time. In addition, processing in nitrogen results in a much smaller ultimate crystallite size than obtained in identical powders processed in argon. Consolidation of these powders by explosive compaction results in dense bodies that retain both their nanostructure and nitrogen content, whereas consolidation by HIPing results in retained nitrogen levels but a loss of nanostructure. Both the nanostructure and the high nitrogen levels of the explosively compacted materials are retained up to 863K.
ISSN:0965-9773
1872-9150
DOI:10.1016/0965-9773(94)90015-9