Fabrication and Nanostructured Surface Layers of Al Alloy by Surface Vibrational Mechanical Attrition
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Fabrication and Nanostructured Surface Layers of Al Alloy by Surface Vibrational Mechanical Attrition 1
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X. Wu , Y. Hong , J. Lu , and K. Lu 1 State Key Lab of Nonlinear Mechanics, Inst of Mech, Chinese Acad of Scis, Beijing, China 2 LASMIS, Univ of Tech of Troyes, 10000, Troyes, France 3 Shenyang National Lab for Mater Sci, Inst of Metal Rsrch, Chinese Acad of Scis, Shenyang, China 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 (
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