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Metals 2016, 6(10), 228; doi:10.3390/met6100228

Strong and Stable Nanocomposites Prepared by High-Pressure Torsion of Cu-Coated Fe Powders

1
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben 8700, Austria
2
RHP-Technology, Seibersdorf 2444, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Chun-Liang Chen
Received: 30 August 2016 / Revised: 16 September 2016 / Accepted: 19 September 2016 / Published: 22 September 2016
(This article belongs to the Special Issue Mechanical Alloying)
View Full-Text   |   Download PDF [3660 KB, uploaded 22 September 2016]   |  

Abstract

Segregation and chemical inhomogeneity are well-known problems in powder metallurgy and are also an issue for new applications of powder mixtures, for example as starting materials for severe plastic deformation. In this study, Cu-coated Fe powder was prepared via immersion deposition, inductively hot-pressed and subsequently deformed using high-pressure torsion. The homogeneity of the pressed material was found to be much better than that of powder mixtures that were prepared for comparison. During severe plastic deformation, higher hardness was observed for the coated powder as compared to powder mixtures even after low strains. In the saturation state, the coated powder was found to result in a hardness of about 600 HV, which is significantly harder than for the powder mixtures. This is attributed to the greater amount of impurities introduced by the coating process. It is shown that coated powders are promising starting materials for severe plastic deformation in order to reduce the amount of strain necessary to reach the saturation state and to obtain high strength and more homogeneous mechanical alloying. View Full-Text
Keywords: immersion coating; electroless deposition; severe plastic deformation; high-pressure torsion; nanocomposite immersion coating; electroless deposition; severe plastic deformation; high-pressure torsion; nanocomposite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Müller, T.; Bachmaier, A.; Neubauer, E.; Kitzmantel, M.; Pippan, R. Strong and Stable Nanocomposites Prepared by High-Pressure Torsion of Cu-Coated Fe Powders. Metals 2016, 6, 228.

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