An Evaluation of Homogeneity and Heterogeneity in Metals Processed by High-Pressure Torsion

R.B. Figueiredoa, M. Kawasakib and T.G. Langdonb, c aDepartment of Materials Engineering and Civil Construction, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil bDepartments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA cMaterials Research Group, School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom

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Processing through the use of high-pressure torsion is attracting much attention at the present time because of the potential for achieving exceptional grain refinement. In principle, it appears that the thin disks used for high-pressure torsion processing should exhibit significant heterogeneity in the as-processed condition. However, experiments show that the development of homogeneity or heterogeneity is dependent upon the crystalline structure of the material. For high-purity aluminum the as-processed microstructure is very homogeneous after five or more revolutions of torsional straining but for the magnesium AZ31 alloy there is a considerable degree of heterogeneity in the as-processed disks.

DOI: 10.12693/APhysPolA.122.425 PACS numbers: 61.66.Bi, 61.66.Dk