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Metals 2015, 5(2), 790-801; doi:10.3390/met5020790

Influence of Particulate Reinforcement and Equal-Channel Angular Pressing on Fatigue Crack Growth of an Aluminum Alloy

Institute of Materials Science and Engineering, Technische Universität Chemnitz, Erfenschlager Str. 73, 09125 Chemnitz, Germany
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Author to whom correspondence should be addressed.
Academic Editor: Heinz Werner Höppel
Received: 26 February 2015 / Revised: 22 April 2015 / Accepted: 12 May 2015 / Published: 18 May 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
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Abstract

The fatigue crack growth behavior of unreinforced and particulate reinforced Al 2017 alloy, manufactured by powder metallurgy and additional equal-channel angular pressing (ECAP), is investigated. The reinforcement was done with 5 vol % Al2O3 particles with a size fraction of 0.2–2 µm. Our study presents the characterization of these materials by electron microscopy, tensile testing, and fatigue crack growth measurements. Whereas particulate reinforcement leads to a drastic decrease of the grain size, the influence of ECAP processing on the grain size is minor. Both reinforced conditions, with and without additional ECAP processing, exhibit reduced fatigue crack growth thresholds as compared to the matrix material. These results can be ascribed to the well-known effect of the grain size on the crack growth, since crack deflection and closure are directly affected. Despite their small grain size, the thresholds of both reinforced conditions depend strongly on the load ratio: tests at high load ratios reduce the fatigue threshold significantly. It is suggested that the strength of the particle-matrix-interface becomes the critical factor here and that the particle fracture at the interfaces dominates the failure behavior. View Full-Text
Keywords: Al 2017 alloy; Al2O3 particulate reinforcement; fatigue crack growth; equal-channel angular pressing (ECAP) Al 2017 alloy; Al2O3 particulate reinforcement; fatigue crack growth; equal-channel angular pressing (ECAP)
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

Köhler, L.; Hockauf, K.; Lampke, T. Influence of Particulate Reinforcement and Equal-Channel Angular Pressing on Fatigue Crack Growth of an Aluminum Alloy. Metals 2015, 5, 790-801.

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