scholarly journals Structure and Tensile Strength of Pure Cu after High Pressure Torsion Extrusion

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1081 ◽  
Author(s):  
Nugmanov ◽  
Mazilkin ◽  
Hahn ◽  
Ivanisenko
Keyword(s):  
High Pressure ◽  
Detailed Analysis ◽  
High Pressure Torsion ◽  
Central Area ◽  
High Strength ◽  
Dislocation Motion ◽  
Gradient Structure ◽  
Sample Edge ◽  
Industrial Use ◽  
Pure Cu

The microstructure and mechanical properties of rod-shaped samples (measuring 11.8 mm in diameter and 35 mm in length) of commercially pure (CP) copper were characterized after they were processed by high pressure torsion extrusion (HPTE). During HPTE, CP copper was subjected to extremely high strains, ranging from 5.2 at central area of the sample to 22.4 at its edge. This high but varying strain across the sample section resulted in HPTE copper displaying a gradient structure, consisting of fine grains in the central area and of ultrafine grains both in the middle-radius area and at the sample edge. A detailed analysis of the tensile characteristics showed that the strength of HPTE copper with its gradient structure is similar to that of copper after severe plastic deformation (SPD) techniques, typically displaying a homogeneous structure. Detailed analysis of the contributions of various strengthening mechanisms to the overall strength of HPTE coper revealed the following: The main contribution comes from Hall–Petch strengthening due to the presence of high and low angle grain boundaries in gradient structure, which act as effective obstacles to dislocation motion. Therefore, both types of boundaries should be taken into account in the Hall–Petch equation. This study on CP copper demonstrated the potential of using the HPTE method for producing high-strength metallic materials in bulk form for industrial use.

Achieving Ultra-High Strength of Al-Cu-Li Alloys by the Combination of High Pressure Torsion and Age-Hardening

2021 ◽  
Author(s):  
Jiahui Dong ◽  
Nong Gao ◽  
Ying Chen ◽  
Lingfei Cao ◽  
Hui Song ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
High Strength ◽  
Age Hardening

Achieving ultra-high strength of Al-Cu-Li alloys by the combination of high pressure torsion and age-hardening

2021 ◽  
pp. 142504
Author(s):  
Jiahui Dong ◽  
Nong Gao ◽  
Ying Chen ◽  
Lingfei Cao ◽  
Hui Song ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
High Strength ◽  
Age Hardening

High-pressure torsion for fabrication of high-strength and high-electrical conductivity Al micro-wires

2014 ◽  
Vol 49 (19) ◽  
pp. 6550-6557 ◽  
Author(s):  
Jorge M. Cubero-Sesin ◽  
Hiroyuki In ◽  
Makoto Arita ◽  
Hideaki Iwaoka ◽  
Zenji Horita
Keyword(s):  
Electrical Conductivity ◽  
High Pressure ◽  
High Pressure Torsion ◽  
High Strength ◽  
High Electrical Conductivity

Processing of Aluminium Alloys by Severe Plastic Deformation

2006 ◽  
Vol 519-521 ◽  
pp. 45-54 ◽  
Author(s):  
Terence G. Langdon
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Severe Plastic Deformation ◽  
Elevated Temperatures ◽  
High Pressure Torsion ◽  
Simple Procedure ◽  
Superplastic Forming ◽  
High Strength ◽  
Ultrafine Grain ◽  
Grain Sizes

Processing through the application of severe plastic deformation (SPD) has become important over the last decade because it is now recognized that it provides a simple procedure for producing fully-dense bulk metals with grain sizes lying typically in the submicrometer range. There are two major procedures for SPD processing. First, equal-channel angular pressing (ECAP) refers to the repetitive pressing of a metal bar or rod through a die where the sample is constrained within a channel bent through an abrupt angle at, or close to, 90 degrees. Second, high-pressure torsion (HPT) refers to the procedure in which the sample, generally in the form of a thin disk, is subjected to a very high pressure and concurrent torsional straining. Both of these processes are capable of producing metallic alloys with ultrafine grain sizes and with a reasonable degree of homogeneity. Furthermore, the samples produced in this way may exhibit exceptional mechanical properties including high strength at ambient temperature through the Hall-Petch relationship and a potential superplastic forming capability at elevated temperatures. This paper reviews these two procedures and gives examples of the properties of aluminum alloys after SPD processing.

scholarly journals Influence of special features of the gradient structure formation during severe plastic deformation of alloys with different types of a crystalline lattice

2019 ◽  
Vol 17 (1) ◽  
pp. 64-75 ◽  
Author(s):  
Georgy I. Raab ◽  
Ilyas S. Kodirov ◽  
Gennady N. Aleshin ◽  
Arseniy G. Raab ◽  
Nikolai K. Tsenev
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Pressure ◽  
Severe Plastic Deformation ◽  
Structure Formation ◽  
High Pressure Torsion ◽  
Crystalline Lattice ◽  
Gradient Structure ◽  
Temperature Range ◽  
Deformation Treatment

Problem Statement (Relevance): The paper describes some features and prospective benefits of deformation by methods of drawing with shear (SD) and high pressure torsion (HPT) in a temperature range of dynamic strain aging (DSA) effect, which allow receiving a high complex of physical and mechanical properties. Objectives: The study aims to investigate and analyze features of the structure formation with the combined application of severe plastic deformation (SPD) and the DSA effect during deformation by drawing with shear and high pressure torsion, to establish patterns of the gradient structure formation. Methods Applied: 1. Computer simulation in Deform 3D software to investigate the stress-strain state on materials with various types of a crystalline lattice: copper grade M1 (FCC), Steel 10 (BCC) and titanium VT1-0 (HCP) and a further comparison with experimental results. 2. Microhardness measurement 3. Scanning and transmission electron microscopy. Originality: This research resulted in investigation of the combined effect of the DSA effect and SPD on the gradient structure formation and mechanical properties of metals with various crystalline lattices. Findings: the paper presents the results of the study of the structure formation during non-monotonous plastic deformation of the alloys (steel 10, copper and titanium) with various crystalline lattice types by SD, as well as ECAP and HPT of low-carbon steel in the temperature range of the DSA effect. Deformation mechanisms and features of the deformation behavior on a mesoscopic scale under various deformation treatment modes are analyzed. The temperature range of the DSA effect in steel 10 under ECAP and the fact of the gradient structure formation under HPT are established. Practical Relevance: The study helped to obtain data that can be used to choose the optimal deformation treatment mode with the DSA effect.

scholarly journals A Novel High-Strength Zn-3Ag-0.5Mg Alloy Processed by Hot Extrusion, Cold Rolling, or High-Pressure Torsion

2020 ◽  
Vol 51 (7) ◽  
pp. 3335-3348 ◽  
Author(s):  
Maria Wątroba ◽  
Wiktor Bednarczyk ◽  
Jakub Kawałko ◽  
Sebastian Lech ◽  
Krzysztof Wieczerzak ◽  
...  
Keyword(s):  
High Pressure ◽  
Cold Rolling ◽  
High Pressure Torsion ◽  
Hot Extrusion ◽  
High Strength
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