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Metals 2015, 5(2), 976-985; doi:10.3390/met5020976

Mechanical Behavior of Ultrafine Gradient Grain Structures Produced via Ambient and Cryogenic Surface Mechanical Attrition Treatment in Iron

U.S. Army Research Laboratory, Weapons and Materials Directorate, Aberdeen Proving Ground, MD 21005-5069, USA
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Academic Editor: Heinz Werner Höppel
Received: 31 March 2015 / Revised: 19 May 2015 / Accepted: 21 May 2015 / Published: 3 June 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
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Abstract

Ambient and cryogenic surface mechanical attrition treatments (SMAT) are applied to bcc iron plate. Both processes result in significant surface grain refinement down to the ultrafine-grained regime; the cryogenic treatment results in a 45% greater grain size reduction. However, the refined region is shallower in the cryogenic SMAT process. The tensile ductility of the grain size gradient remains low (<10%), in line with the expected behavior of the refined surface grains. Good tensile ductility in a grain size gradient requires the continuation of the gradient into an undeformed region. View Full-Text
Keywords: grain size gradient; surface mechanical attrition treatment; cryogenic; ultrafine-grained grain size gradient; surface mechanical attrition treatment; cryogenic; ultrafine-grained
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

Murdoch, H.A.; Darling, K.A.; Roberts, A.J.; Kecskes, L. Mechanical Behavior of Ultrafine Gradient Grain Structures Produced via Ambient and Cryogenic Surface Mechanical Attrition Treatment in Iron. Metals 2015, 5, 976-985.

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