Principles of ECAP–Conform as a continuous process for achieving grain refinement: Application to an aluminum alloy

Xu, Cheng; Schroeder, Steven R.; Berbon, Patrick B.; Langdon, Terence G.

doi:10.1016/j.actamat.2009.10.044

Cited by 136 publications

(73 citation statements)

References 39 publications

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“…X-ray studies were performed using Ultima IV diffractometer (Rigaku, Tokyo, Japan) by CuKα irradiation (30 ) and crystalline lattice parameter (а) were calculated using Rietveld analysis with the help of MAUD software (copyright by L. Lutterotti, Trento, Italy) [35]. To estimate dislocation density (ρ), the Equation (1) was used [36].…”

Section: Methodsmentioning

confidence: 99%

“…Apart from that, the ECAP-C technique is capable of producing long-length UFG billets that could be used as ingots for industrial processes [26]. As an example, the given SPD technique allowed producing UFG structures in long-length Ti and Al alloy rods [27][28][29][30], as well as in steel ones [31], resulting in a considerable enhancement of both mechanical and service characteristics as compared to similar semi-finished billets processed via conventional techniques.…”

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confidence: 99%

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Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Murashkin

Medvedev

Kazykhanov

et al. 2015

Metals

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This paper studies the effect of equal channel angular pressing-Conform (ECAP-C) and further artificial aging (AA) on microstructure, mechanical, and electrical properties of Al 6101 alloy. As is shown, ECAP-C at 130 °C with six cycles resulted in the formation of an ultrafine-grained (UFG) structure with a grain size of 400-600 nm containing nanoscale spherical metastable β′ and stable β second-phase precipitates. As a result, processed wire rods demonstrated the ultimate tensile strength (UTS) of 308 MPa and electrical conductivity of 53.1% IACS. Electrical conductivity can be increased without any notable degradation in mechanical strength of the UFG alloy by further AA at 170 °C and considerably enhanced by additional decomposition of solid solution accompanied by the formation of rod-shaped metastable β′ precipitates mainly in the ultrafine grain interior and by the decrease of the alloying element content in the Al matrix. It is demonstrated that ECAP-C can be used to process Al-Mg-Si wire rods with the specified UFG microstructure. The mechanical strength and electrical conductivity in this case are shown to be much higher than those in the industrial semi-finished products made of similar material processed by the conventional T6 or T81 treatment. OPEN ACCESSMetals 2015, 5 2149

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Murashkin

Medvedev

Kazykhanov

et al. 2015

Metals

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“…The material was processed at 473 K using ECAP-Conform [28,29] in which rods, having square sections of 14  14 mm 2 , were constrained within a groove in a conventional conform facility and then forced to exit at an abutment where they were turned abruptly through an angle of 90 so that a strain of ~1 was introduced on each passage through the facility [30]. In the present experiments, the rods were processed for a total of 8 passes using processing route C in which the rods are rotated around their longitudinal axes by 180 between each pass [31].…”

Section: Experimental Materials and Proceduresmentioning

confidence: 99%

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

Zhang

Wang

Zhilyaev

et al. 2015

Materials Science and Engineering: A

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The mechanical behavior of commercial purity titanium with a nanocrystalline (NC) grain size was investigated using split Hopkinson pressure bar tests at high strain rates and over a range of temperatures. The study was accompanied by detailed microstructural investigations before and after compression testing. The results show that rotary dynamic recrystallization operates during compressive deformation at strain rates of ~3000 and ~4500 s -1 at temperatures from 298 to 573 K but cells form at 673 K. The dynamic mechanical behavior of NC Ti shows a strong dependence on temperature and strain rate such that the flow stress and the strain hardening rate both increase with increasing strain and decreasing temperature. A constitutive equation is derived to relate the flow stress to the temperature, strain rate and true strain and to predict the yield strength and the peak stress of NC Ti subjected to dynamic deformation at elevated temperatures.

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“…This change in the initial structure occurs in the conditions of intensive straining by the simple shear scheme, which takes place in the process of ECAP [1,2]. The intensity of UFG structure formation largely depends on the pressing route, the route Bc is most preferable [2,4]. Typically, the grain structure with an average crystallite size of about 0.3-0.5 µm forms in deformed metals after the accumulation of strain е=4 and more [2].…”

Section: Introductionmentioning

confidence: 99%

The innovation potential of ECAP techniques of severe plastic deformation

Рааб

2014

IOP Conf. Ser.: Mater. Sci. Eng.

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The innovation potential of ECAP techniques of severe plastic deformation Georgy Raab Ufa State Aviation Technical University, Ufa, Russia E-mail: giraab@mail.ru AbstractThe most considerable factors influencing flow uniformity and a strained state of billets, respectively, structure formation processes and ECAP techniques with industrial potential have been studied. It is shown that the industrial potential of ECAP techniques largely depends on the intensity of strain accumulation per a processing cycle. Enhancement of this value considerably reduces the labor intensity of manufacturing of semi-products with an ultrafinegrained (UFG) structure.

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Principles of ECAP–Conform as a continuous process for achieving grain refinement: Application to an aluminum alloy

Cited by 136 publications

References 39 publications

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

The innovation potential of ECAP techniques of severe plastic deformation

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