Nanophase Fe alloys consolidated to full density from mechanically milled powders

L. He, L. F. Allard, K. Breder, E. Ma

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16 Scopus citations

Abstract

Nanophase elemental Fe powders prepared by mechanical milling were sinter forged to full density with an average grain size in the nanophase range (below 100 nm). If Cu additions are introduced during milling to form supersaturated solid solutions (Fe85Cu15 and Fe60Cu40), grain sizes can be easily controlled to below 50 nm after consolidation. For Fe-Cu, it was observed that atomic level alloying between the two elements during milling was very helpful for obtaining a homogeneous microstructure and nanocrystalline grain/domain sizes in the consolidated product. The advantages of using sinter forging (upset die forging), as well as the role of the Cu addition, in the retention of nanocrystalline grain sizes are discussed. The consolidated Fe alloys exhibit very high strength under compression, further demonstrating that low populations of flaws and nanophase grain structures were attained in the consolidated products.

Original languageEnglish
Pages (from-to)904-912
Number of pages9
JournalJournal of Materials Research
Volume15
Issue number4
DOIs
StatePublished - Apr 2000

Funding

The authors thank Prof. K.T. Ramesh and Mr. Dexin Jia for their input in this study. This work has been supported by the National Science Foundation, Grant Nos. CMS-9409750, CMS-9424324, and CMS-9877006. Research performed at ORNL was sponsored by the Southern Universities Research Association-ORNL-University Graduate Summer Research Program in Materials Science and by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies as part of the HTML User Program, ORNL, managed by Lockheed Martin Energy Research Corp. for the Department of Energy under Contract No. DE-AC05-96OR22464.

FundersFunder number
National Science FoundationCMS-9877006, CMS-9424324, CMS-9409750
U.S. Department of EnergyDE-AC05-96OR22464
Office of Energy Efficiency and Renewable Energy
Gulf Research Program
Water Power Technologies Office
Southern Nursing Research Society

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