Application of High Pressure Torsion to Bulk Samples

Genki Sakai; Katsuaki Nakamura; Z. Horita; Terence G. Langdon

doi:10.4028/www.scientific.net/MSF.503-504.391

Paper Titles

Historic Retrospection and Present Status of Severe Plastic Deformation in China
p.363

Scaling up of Equal Channel Angular Pressing (ECAP) for the Production of Forging Stock
p.371

Deformation Mechanics Associated with Formation of Ultra-Fine Grained Chips in Machining
p.379

Continuous Grain Refinement Using Severe Torsion Straining Process
p.385

Application of High Pressure Torsion to Bulk Samples
p.391

Specific Features of the Strengthening during Severe Plastic Deformation of Supersaturated Solid Solutions
p.399

Differences in Structural Evolution in Single- and Dual-Phase Materials during Severe Plastic Deformation
p.407

Formation of Supersaturated Solid Solutions in Al Alloys with Transition Metals Upon Shear under Pressure
p.413

Martensitic Transformation and Mechanical Behavior of TiNi Shape Memory Alloys after Severe Plastic Deformation
p.419

HomeMaterials Science ForumMaterials Science Forum Vols. 503-504Application of High Pressure Torsion to Bulk...

Application of High Pressure Torsion to Bulk Samples

Abstract:

High pressure torsion (HPT) is a well-known procedure to impart severe plastic deformation (SPD) into metallic materials. It was reported that HPT produces grain sizes finer than those using other SPD processes such as equal-channel angular pressing (ECAP). However, the application of HPT has been restricted to thin disk samples. In this study, an HPT process was developed for use with bulk samples. This process is designated as Bulk-HPT for comparison with conventional Disk-HPT. Cylindrical samples of an Al-3%Mg-0.2%Sc alloy having dimensions of 10 mm in diameter and 8.6 mm in height were prepared for Bulk-HPT. The samples were strained under a pressure of 1 GPa for 2 turns at room temperature. Microstructural observations revealed that the samples contained regions having a grain size of ~130 nm. Tensile testing showed a superplastic ductility ~480 % at 673 K with an initial strain rate of 3.3x10-2 s-1.

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Periodical:

Materials Science Forum (Volumes 503-504)

Pages:

391-398

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.503-504.391

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Online since:

January 2006

Authors:

Genki Sakai, Katsuaki Nakamura, Z. Horita, Terence G. Langdon

Keywords:

Annealing, Grain Refinement, High Pressure Torsion (HPT), Superplasticity

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