Paper Title:
Study of the Nanometric Grain Size Distribution in Iron Compacts Obtained by Mechanical Milling
  Abstract

A study has been carried out on the grain size distribution of cylindrical compacts obtained by consolidation of iron powder severely deformed by mechanical milling. Consolidation has been performed in two consecutive steps: cold and hot conditions. The hot one was done at two temperatures, namely 425 and 475°C. After milling, the iron powder has a grain size of 8 nm (± 4 nm) with an average hardness of 800 HV. After hot compaction the grain size increases up to 50 nm, especially at 475°C where a small fraction of grains reach larger values than the average. The grain size was evaluated by two different techniques, X-Ray Diffraction and Transmission Electron Microscopy. Results showed some differences between both methods. The advantage of using TEM is that grain size distribution, and not only the average size, can be obtained. Small discs were also obtained from the compacted specimen in order to fracture them on a “ball on three balls” equipment. The fracture behaviour of the samples was then studied by SEM.

  Info
Periodical
Materials Science Forum (Volumes 503-504)
Edited by
Zenji Horita
Pages
1007-1012
DOI
10.4028/www.scientific.net/MSF.503-504.1007
Citation
J. Llumà, J. A. Benito, A. Roca, J. M. Cabrera, J. M. Prado, "Study of the Nanometric Grain Size Distribution in Iron Compacts Obtained by Mechanical Milling", Materials Science Forum, Vols. 503-504, pp. 1007-1012, 2006
Online since
January 2006
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$32.00
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