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Fabrication and Nanostructured Surface Layers of Al Alloy by Surface Vibrational Mechanical Attrition

Published online by Cambridge University Press:  17 March 2011

X. Wu ,
Y. Hong ,
J. Lu  and
K. Lu
X. Wu
Affiliation:
State Key Lab of Nonlinear Mechanics, Inst of Mech, Chinese Acad of Scis, Beijing, China
Y. Hong
Affiliation:
State Key Lab of Nonlinear Mechanics, Inst of Mech, Chinese Acad of Scis, Beijing, China
J. Lu
Affiliation:
LASMIS, Univ of Tech of Troyes, 10000, Troyes, France
K. Lu
Affiliation:
Shenyang National Lab for Mater Sci, Inst of Metal Rsrch, Chinese Acad of Scis, Shenyang, China
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Abstract

Nanograins were introduced into the surface layers of an Al-alloy during surface vibrational mechanical attrition. Transmission electron microscopy revealed that microstructures developed with an increase in strain, in the following sequence, i.e., lamellar microbands of elongated subgrains, equiaxed submicro-, and nano-grains respectively. The grain subdivision into the subgrains was found to be the main mechanism responsible for grain refinement. The simultaneous evolution of high boundary misorientations was ascribed to the boundary rotation for accommodating further strains. Results showed that the grains could refine remarkably into the nanometer regime (<100 nm) within the outer surface of the layer. The depth of the nanocrystal layers increased and the grain size decreased with the extension of processing time. The nanocrystal layers evidenced an increase in hardness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 697: Symposium P – Surface Engineering 2001--Fundamentals and Applications , January 2001 , P8.14
Copyright
Copyright © Materials Research Society 2002

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