Equal-Channel Angular Pressing(ECAP): A Novel Method for Microstructural Control.

Horita, Zenji; Furukawa, Masato; Langdon, T.G.; Nemoto, Minoru

doi:10.2320/materia.37.767

Cited by 49 publications

(16 citation statements)

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“…One of the promising methods for grain refinement is severe plastic deformation (SPD) process, 1,2) such as high pressure torsion (HPT), 3) equal channeling angular pressing (ECAP), 4,5) accumulative roll bonding (ARB) 6) and mechanical milling (MM) or alloying (MA). [7][8][9][10][11][12][13][14][15] The MM treatment at near room temperature, which is one of SPD-powder metallurgy (SPD-PM) process, gives an extremely large deformation compared with other SPD processes in bulk materials mentioned above, and it easily leads to the nano grain structure with the grain size less than 10 nm in diameter.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Mechanical Properties of Nano/Meso Hybrid Structure Materials Produced by Hot Roll Sintering Process

et al. 2008

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SUS316L stainless steel and commercially pure titanium powders are processed by Mechanical Milling (MM) which is one of Severe Plastic Deformation (SPD) process. These MM powders are sintered by Hot Roll Sintering (HRS) process. Microstructure of materials produced by HRS process consists of a shell and core hybrid microstructure, that is, a shell structure with nano grains and a core structure with workhardened coarse grains. All of the HRS materials demonstrate not only superior strength but also good elongation. The mechanical properties are strongly influenced by the shell/core microstructure. The nano/meso hybrid microstructure by HRS process has been proved to be very effective to improve mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Enhanced Mechanical Properties of Nano/Meso Hybrid Structure Materials Produced by Hot Roll Sintering Process

et al. 2008

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“…2(b)). 16) Grease containing fine particles of MoS 2 was used to reduce the frictional force between the test piece and the die. The equivalent strain induced by a single pass through the ECAP press was estimated at about 0.47 using the following equation:…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] Many studies have indicated that the refinement and homogenization of the microstructures are effective for achieving good mechanical properties, such as ductility and toughness. 9,10) Severe Plastic Deformation (SPD) processes such as high-pressure torsion (HPT), [11][12][13] accumulative roll bonding (ARB), 14,15) equal-channel angular pressing (ECAP), 16,17) and friction stir processing (FSP) 18,19) have been developed as new solid-state processing techniques for microstructural modification. SPD processes lead to the significant refinement of grains, 20) the reduction of micropores, 9) and, particularly, the homogeneous distribution of the Si particles in the aluminum matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of Eutectic Si Particle Morphology on ECAP Formability and Mechanical Properties of AC4CH Aluminum Casting Alloys

Nakayama

Miyazaki

2011

Mater. Trans.

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AC4CH casting alloys were subjected to the 2-step preheating and the ECAP processing at room temperature. Microstructure change was investigated in terms of size and globularity of the eutectic Si particles and hardness of the primary and the eutectic -Al. The effects of 2-step preheating, ECAP processing and standard T6 heat treatment on the hardness and the tensile properties were also investigated. The results of this study are as follows. The ECAP formability was significantly improved by the optimum 2-step preheating (1st-step preheating at 560 C and 2nd-step preheating at 350 C). More than 12-times ECAP pressing (equivalent strain of about 5.6) could be made without cracking. The hardness distribution in the primary -Al suggested that the accumulated plastic strain during the ECAP processing increased gradually toward the eutectic cell regions. The hardness measurement also showed that the accumulated plastic strain of the eutectic -Al around less-globular Si particles was higher than that around globular Si particles. Concentration of the plastic strain may promote cracking in the eutectic cell regions and deteriorate the ECAP formability. Successive processing by the 2-step preheating, the ECAP processing and the standard T6 heat treatment brought about globularity and homogeneous distribution of the eutectic Si particles. During the tensile deformation, these microstructural features might lead to homogeneous distribution of the plastic strain, suppressions of the cracking of Si particles and the delamination between the Si particle and the matrix. As a result, the 0.2% proof stress and the fracture strain increased about 11% and 47% respectively compared with those of the standard T6 treated sample.

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“…Recently, many investigations have been performed on severe plastic deformation (SPD) processes, such as high pressure torsion, 1,2) equal channel-angular pressing, 3,4) and, accumulative roll bonding, 59) for manufacturing ultrafine grained metallic materials with grain sizes smaller than 1 µm, as reviewed by Azushima et al 10) It has been also suggested that the conventional cold wire drawing process has the same nature as the SPD processes when the total imposed strain used to manufacture fine wires are greater than 4.0.…”

Section: Introductionmentioning

confidence: 99%

Changes in Mechanical Characteristics of Pre-Annealed Wires of Cu–Sn Alloy Manufactured by Continuous Draw Bending

et al. 2012

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The changes in mechanical properties and microstructures of fine CuSn alloy wires manufactured by deep wire drawing and heat treatment, and of the wires deformed by draw bending were systematically investigated. During draw bending, the wires were subjected to the compressive/tensile or tensile/compressive strain in the longitudinal direction. As a result, it was confirmed that the softening caused by plastic deformation was induced when easing up the wire drawing strain by heat treatment were few, such as the decreasing strength and increasing elongation. Work hardening was induced when easing up the wire drawing strain by heat treatment were large, such as the increasing strength and decreasing elongation. With decreasing strength of softening induced by plastic deformation, increase in grain size is smaller than the strength deterioration. Additionally, it was confirmed that the occupancy probability of high-angle grain boundaries increases. This can be understood by considering that the many dislocations formed inside the grains are piled up in one direction during draw bending. Additionally, it is considered that ductility enhancement is caused by the increase in work hardening rate induced by the piled up dislocations.

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Equal-Channel Angular Pressing(ECAP): A Novel Method for Microstructural Control.

Cited by 49 publications

References 0 publications

Enhanced Mechanical Properties of Nano/Meso Hybrid Structure Materials Produced by Hot Roll Sintering Process

Enhanced Mechanical Properties of Nano/Meso Hybrid Structure Materials Produced by Hot Roll Sintering Process

Effect of Eutectic Si Particle Morphology on ECAP Formability and Mechanical Properties of AC4CH Aluminum Casting Alloys

Changes in Mechanical Characteristics of Pre-Annealed Wires of Cu–Sn Alloy Manufactured by Continuous Draw Bending

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Equal-Channel Angular Pressing(ECAP): A Novel Method for Microstructural Control.

Cited by 49 publications

References 0 publications

Enhanced Mechanical Properties of Nano/Meso Hybrid Structure Materials Produced by Hot Roll Sintering Process

Enhanced Mechanical Properties of Nano/Meso Hybrid Structure Materials Produced by Hot Roll Sintering Process

Effect of Eutectic Si Particle Morphology on ECAP Formability and Mechanical Properties of AC4CH Aluminum Casting Alloys

Changes in Mechanical Characteristics of Pre-Annealed Wires of Cu&ndash;Sn Alloy Manufactured by Continuous Draw Bending

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Changes in Mechanical Characteristics of Pre-Annealed Wires of Cu–Sn Alloy Manufactured by Continuous Draw Bending