Evolution of microstructure, macrotexture and mechanical properties of commercially pure Ti during ECAP-conform processing and drawing

Гундеров, Д. В.; Polyakov, A.; Semenova, Irina P.; Рааб, Г. И.; Churakova, Anna; Gimaltdinova, E.I.; Sabirov, I.; Segurado, J.; Ситдиков, В. Д.; Alexandrov, Igor; Enikeev, Nariman A.; Valiev, Ruslan Z.

doi:10.1016/j.msea.2012.11.007

Cited by 155 publications

(97 citation statements)

References 36 publications

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“…Processing and mechanical testing of the material was performed in the Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Russia and is detailed in [34]. The starting material was a CP Ti (Grade 4) in form of billets and it was subjected to ECAP-C processing at 200 °C for different number of passes (in the range 1-10).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Orientation distribution functions (ODF) were obtained by X-ray diffraction after the four ECAP passes [34] and the resulting pole figures in the rod direction (x3) are shown in Fig. 3a.…”

Section: Tensile Deformation Of Nanostructured Timentioning

confidence: 99%

“…The nanostructured Ti billets produced in [34] after six ECAP-C passes were subjected to drawing at 200 °C to produce rods with the longitudinal axis oriented in x3 direction (Fig. 2).…”

Section: Simulation Of the Drawing Process After Ecapmentioning

confidence: 99%

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Simulation of the deformation of polycrystalline nanostructured Ti by computational homogenization

Segurado

LLorca

2013

Computational Materials Science

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Computational homogenization by means of the finite element analysis of a representative volume element of the microstructure is used to simulate the deformation of nanostructured Ti. The behavior of each grain is taken into account using a single crystal elasto-viscoplastic model which includes the microscopic mechanisms of plastic deformation by slip along basal, prismatic and pyramidal systems. Two different representations of the polycrystal were used. Each grain was modeled with one cubic finite element in the first one while many cubic elements were used to represent each grain in the second one, leading to a model which includes the effect of grain shape and size in a limited number of grains due to the computational cost. Both representations were used to simulate the tensile deformation of nanostructured Ti processed by ECAP-C as well as the drawing process of nanostructured Ti billets. It was found that the first representation based in one finite element per grain led to a stiffer response in tension and was not able to predict the texture evolution during drawing because the strain gradient within each grain could not be captured. On the contrary, the second representation of the polycrystal microstructure with many finite elements per grain was able to predict accurately the deformation of nanostructured Ti.

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Section: Numerical Resultsmentioning

confidence: 99%

“…Orientation distribution functions (ODF) were obtained by X-ray diffraction after the four ECAP passes [34] and the resulting pole figures in the rod direction (x3) are shown in Fig. 3a.…”

Section: Tensile Deformation Of Nanostructured Timentioning

confidence: 99%

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Simulation of the deformation of polycrystalline nanostructured Ti by computational homogenization

Segurado

LLorca

2013

Computational Materials Science

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“…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.…”

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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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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“…Equal-channel angular pressing (ECAP) [10], one of the major SPD techniques, is especially attractive for fabricating relatively large volumes of homogeneously deformed bulk UFG/NC materials [11][12][13][14][15] and some reports suggest that a two-step processing route of ECAP combined with drawing [16][17][18], extrusion [19,20] or rolling [8,21] may be utilized successfully to even further improve the mechanical properties of UFG/NC Ti.…”

Section: Introductionmentioning

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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Evolution of microstructure, macrotexture and mechanical properties of commercially pure Ti during ECAP-conform processing and drawing

Cited by 155 publications

References 36 publications

Simulation of the deformation of polycrystalline nanostructured Ti by computational homogenization

Simulation of the deformation of polycrystalline nanostructured Ti by computational homogenization

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

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