Visualization and Quantification of Severe Internal Deformation on Compressive Torsion Process

Yuji Kume; Masakazu Motohashi; Makoto Kobashi; Naoyuki Kanetake

doi:10.4028/www.scientific.net/MSF.654-656.1247

Paper Titles

Formation of Deformation Twins and Related Shear Bands in Copper Single Crystals Pressed by ECAP
p.1231

Susceptibility to Hydrogen Embrittlement of IF Steel with Ultrafine-Grained Structure Produced by Accumulative Roll-Bonding Process
p.1235

High Strength and Ductility in Ball-Milled Titanium Powders Consolidated by High-Pressure Torsion
p.1239

Aging Behavior of Al-Li-Cu-Mg Alloy Processed by High-Pressure Torsion
p.1243

Visualization and Quantification of Severe Internal Deformation on Compressive Torsion Process
p.1247

Deformation Characteristics in AlphaType Brass Worked by Torsion
p.1251

Structure and Mechanical Properties of Asymmetrically Rolled IF Steel Sheet
p.1255

Texture Change of Severe Plastically Deformed Al Alloy Sheets
p.1259

Steel-Magnesium Composite Wire Obtained by Repeated Co-Extrusion
p.1263

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Visualization and Quantification of Severe Internal Deformation on Compressive Torsion Process

Abstract:

Compressive torsion process (CTP) which was developed by authors is effective process for grain and precipitates refinement of metallic materials with a severe plastic deformation. In the CTP, a cylindrical specimen is subjected to simultaneous compressive and torsional loading without change in its shape. However, metal flow and strain distribution in the processed specimen are not cleared, because the deformation is very large and complicated. In the present work, visualization of internal deformation of specimen processed by CTP was investigated using dual alloy etching technique. Two kinds of aluminum alloy were prepared by cutting on fan-like shape and alternately placed to a cylindrical shape. After CTPing, contrasts in the specimen were observed by polishing and etching. The internal distribution of shear strain was quantified by measuring the displacement of interface between the alloys. As a result, the visualization and quantification of internal deformation was successfully carried out using the technique. The internal strain distribution was varied not only in radial direction but also in longitudinal direction because of frictional constraint on the lateral face. A laminate contrast of the alloys observed on the vertical cross section was well related with the strain distribution in the specimen.