Influence of pressing speed on microstructural development in equal-channel angular pressing

Berbon, Patrick B.; Furukawa, Mutsuhisa; Horita, Zenji; Nemoto, Minoru; Langdon, Terence G.

doi:10.1007/s11661-999-0009-9

Cited by 156 publications

(71 citation statements)

References 22 publications

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“…Vickers microhardness HV0.1 (F=100 g, dwell time t=10 s) was measured on a semi-automatic Wolpert tester allowing automatic indentation. The variations of microhardness along the different surfaces of ECAP billets were inspected by making 3 lines of indents; one in the centre and other two 2.5 mm from the edge of each plane of the billet (X, Y and Z plane) [10].…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Ultra-Fine Grained Az31 Alloy Processed by Ecap

Janeček¹,

Stranska²,

Čı́žek³

2014

Acta Metall Slovaca

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Commercial magnesium alloy AZ31 was processed by equal channel angular pressing preceded by hot extrusion (EX-ECAP). Microstructure evolution with strain due to ECAP was investigated by light and transmission electron microscopy. ECAP processing resulted in continuous grain fragmentation, significant grain refinement and the formation of dislocations. Dislocation structure changes in individual specimens after different number of ECAP passes were investigated by positron annihilation spectroscopy (PAS). Substantial increase of dislocation density occurred during the first two passes of ECAP and was followed by the decline manifesting the dynamic recovery at higher strains. The microstructure and defect structure evolution correlates well with mechanical properties as determined by a detail inspection of microhardness variations in individual ECAPed specimens.

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Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…The most probable recovery mechanisms are the mutual annihilation of dislocations and/or their rearrangement into lower energy structures with increasing strain imposed to the material by ECAP [2,10]. Fig.…”

Section: Dislocation Densitymentioning

confidence: 99%

Microstructure and Mechanical Properties of Ultra-Fine Grained Az31 Alloy Processed by Ecap

Janeček¹,

Stranska²,

Čı́žek³

2014

Acta Metall Slovaca

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“…The revealed that the temperature range for ECAP in order to control the resulting microstructure as a variety of phase transformations might occur in this metastable β-Ti alloy at elevated temperatures. They found that the ECAP at 673 K led to the occurrence of omega (ω) phase in alloy and resulted in higher strength and hardness but less ductility compared with those in the alloy processed at a a higher temperature of 903 K. [20] Miroslav et al [21] investigated the effect of ECAP on the microstructure and the mechanical properties of CP-Ti and demonstrated that the main mechanism of significant strengthening of Ti increases was grain refinement. The UFG-Ti has higher specific strength than ordinary Ti.…”

Section: Effect Of Ecap On Mechanical Propertiesmentioning

confidence: 99%

Mechanical Properties of ECAP-Biomedical Titanium Materials: A Review

Mohammed¹,

Hussain²

2015

IJIRSET

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Wide use of titanium (Ti) materials in medicine gives impetus to a search for development new techniques with elevated properties such as strength, corrosion resistance and Young's modulus close to that of bone tissue. This article presents most recent state of the art on the use of equal channel angular pressing (ECAP) technique in evolving mechanical characteristics of the ultrafine-grained bio-grade Ti materials. Over past few decades, research activities in this area have grown enormously and have produced interesting results, including achieving combination of conflicting properties that are desirable for biomedical applications by severe plastic deformation (SPD) processing. A review of the most recent work in this area is systematically presented. The challenges in processing ultrafinegrained Ti materials are identified and discussed. An overview of the biomedical Ti alloys processed with ECAP technique is given in this review, along with a summary of their effect on the important mechanical properties that can be achieved by SPD processing. The paper also offers insights in the mechanisms underlying SPD.

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“…The principles of ECAP are depicted schematically in figure 1 [13] . The sample, in the form of a rod or bar, is machined to fit within a channel contained in an ECAP die and it is then pressed through the die using a plunger.…”

Section: I In Nt Tr Ro Od Du Uc Ct Ti Io On N T To O S Se Ev Ve mentioning

confidence: 99%

“…It can be shown from simple geometric calculations that the strain imposed on the sample in a single pass depends primarily upon the angle between the two parts of the channel but also to a minor extent upon the magnitude of the F Fi ig gu ur re e 1 1. The principles of ECAP [13] .…”

Section: I In Nt Tr Ro Od Du Uc Ct Ti Io On N T To O S Se Ev Ve mentioning

confidence: 99%

Processing of ultrafine-grained materials using severe plastic deformation: potential for achieving exceptional properties

Langdon

2008

Rev. metal.

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P Pr ro oc ce es ss si in ng g o of f u ul lt tr ra af fi in ne e--g gr ra ai in ne ed d m ma at te er ri ia al ls s u us si in ng g s se ev ve er re e p pl la as st ti ic c d de ef fo or rm ma at ti io on n: : p po ot te en nt ti ia al l f fo or r a ac ch hi ie ev vi in ng g e ex xc ce ep pt ti io on na al l p pr ro op pe er rt ti ie es s ( (• •) ) T.G. Langdon *, ** A Ab bs st tr ra ac ct tThe processing of polycrystalline metals through the application of severe plastic deformation is attracting much attention because of the potential for achieving significant grain refinement to the submicrometer or nanometer level. This paper reviews the principles of this type of processing with emphasis on two different techniques: EqualChannel Angular Pressing and High-Pressure Torsion. Exceptional properties may be achieved from these processes including high strength at ambient temperatures and a rapid superplastic forming capability at elevated temperatures. Some examples are presented demonstrating the potential use of this type of processing. K Ke ey yw wo or rd ds sEqual-channel angular pressing; High-Pressure torsion; Severe plastic deformation; Ultrafine grains. P Pr ro oc ce es so o d de e m ma at te er ri ia al le es s u ul lt tr ra af fi in no o--g gr ra an nu ul lo os so os s u us sa an nd do o l la a d de ef fo or rm ma ac ci ió ón n p pl lá ás st ti ic ca a s se ev ve er ra a: : p po ot te en nc ci ia al l p pa ar ra a a al lc ca an nz za ar r c ca ar ra ac ct te er rí ís st ti ic ca as s e ex xc ce ep pc ci io on na al le es s

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Influence of pressing speed on microstructural development in equal-channel angular pressing

Cited by 156 publications

References 22 publications

Microstructure and Mechanical Properties of Ultra-Fine Grained Az31 Alloy Processed by Ecap

Microstructure and Mechanical Properties of Ultra-Fine Grained Az31 Alloy Processed by Ecap

Mechanical Properties of ECAP-Biomedical Titanium Materials: A Review

Processing of ultrafine-grained materials using severe plastic deformation: potential for achieving exceptional properties

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