Microstructure characterization of Cu processed by compression with oscillatory torsion

Rodak, K.; Pawlicki, J.

doi:10.1016/j.matchar.2014.05.002

Cited by 15 publications

(15 citation statements)

References 22 publications

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“…At large strains the development of UFG and nanocrystalline structures is accompanied by a decrease in dislocation density. This same phenomenon is observed during COT and RCMR deformation especially during deformation of pure metals [31]. However, alloying elements introduced into base metal increase successfully dislocation density [47,48].…”

Section: Dislocationssupporting

confidence: 75%

“…Systematic studies of the effect of COT deformation on the structure of Cu confirmed the high activity of the recovery process during deformation [31]. Insufficient efficiency of grain refinement is evident for solid solution alloying state.…”

Section: Subgrais Obtained By Recovery Processmentioning

confidence: 79%

“…Higher concentration of Fe atoms in Cu-2% Fe alloy contributes in greater increase of dislocation density during deformation than in Cu-0.6% Cr alloy. It was shown in [31,32] that, during cyclic deformation with the increase of ε ft , a decrease in the dislocation density is observed. In the result the most of the grains are delineated with poorly defined boundaries with low misorientation angles (LABs).…”

Section: Subgrais Obtained By Recovery Processmentioning

confidence: 99%

“…More information's about these methods is presented in [28,29]. A considerable variety of materials -pure metals and alloys with different crystal structure have been successfully processed by these methods [30,31]. Microstructure evolution of ultrafinegrained materials for different crystal structures processed by these method have been investigated as a function of strain and deformation parameters imposed to the material and correlated with mechanical properties of these materials [32,34].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

Rodak¹

2018

MATERIAL ENGINEERING

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COT (compression with oscillatory torsion) is a simple process that has the ability to deform bulk metallic samples. Performed investigations show that this method of deformation leads to grain refinement of Cu-Cr and Cu-Fe alloys. The grain size obtained via the dislocation subdivision mechanism associated with generation of non-equilibrum grain boundaries is in the UFG range. Large fraction of grain boundaries have low angles of misorientation. The limitation of the grain refinement and creation of low angles boundaries can be attributed to the extensive dynamic recovery. However, recrystallization process and deformation twinning plays a crucial role in grain refinement resulting in grain refinement to the nanoscale. The present overview shows that many structural elements accompanying formation UGF structure influence on understanding of the microstructure-properties relationship in these materials.

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Section: Dislocationssupporting

confidence: 75%

Section: Subgrais Obtained By Recovery Processmentioning

confidence: 79%

Section: Subgrais Obtained By Recovery Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

Rodak¹

2018

MATERIAL ENGINEERING

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“…The combination of these methods in a single deformation procedure enables the optimization of the microstructure and mechanical properties. COT investigations were performed for Cu and Al [14][15][16][17][18][19] and this method was recognized as an effective tool for obtaining ultrafine grains/subgrains with a mixture of low-and high-angle grain boundaries.…”

Section: Two Original Methods Patented At Silesian University Of Techmentioning

confidence: 99%

Cu-Cr and Cu-Fe Alloys Processed by New Severe Plastic Deformation: Microstructure and Properties

Rodak¹

2017

Severe Plastic Deformation Techniques

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In this chapter, two techniques have been proposed for grain refinement in Cu-Cr and Cu-Fe alloys in different heat treatment conditions. First method, known as rolling with cyclic movement of rolls (RCMR), is appropriate for the manufacturing of ultrafine grained sheets and plates. The second method is called compression with oscillatory torsion (COT). Structural investigations of alloys were carried out, in particular, using a cold field emission gun/scanning electron microscope (FEG/SEM) equipped with an electron backscattering diffraction (EBSD) detector and a scanning transmission electron microscope (STEM). Quantitative studies of the microstructure based on the STEM images were performed using the "MET-ILO" software package. Mechanical properties were determined using an MST QTest/10 instrument equipped with digital image correlation (DIC). Based on the SEM and STEM observations, it has been shown that the alloys may exhibit a refinement of the ultra fine grained (UFG) structure in the 200-500 nm range with a mixture of low-and high-angle boundaries. Although the microstructure was refined significantly, the heterogeneity of the microstructure after the application of a high total effective strain is observed. Moreover, the low-angle boundaries formed at the early stages do not continuously transform into high-angle boundaries.

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Influence of Deformation Stress Triaxiality on Microstructure and Microhardness of Pure Copper Processed by Simultaneous Torsion and Tension

Chen

et al. 2017

J. of Materi Eng and Perform

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Microstructure characterization of Cu processed by compression with oscillatory torsion

Cited by 15 publications

References 22 publications

Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

Microstructure characterization of ultrafine grained Cu alloys processed by methods with cyclic scheme of deformation

Cu-Cr and Cu-Fe Alloys Processed by New Severe Plastic Deformation: Microstructure and Properties

Influence of Deformation Stress Triaxiality on Microstructure and Microhardness of Pure Copper Processed by Simultaneous Torsion and Tension

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