Remarkable transitions of yield behavior and Lüders deformation in pure Cu by changing grain sizes

Tian, Yanzhong; Gao, Si; Zhao, Lijia; Lu, Sheng; Pippan, Reinhard; Zhang, Z.F.; Tsuji, Nobuhiro

doi:10.1016/j.scriptamat.2017.08.034

Cited by 138 publications

(32 citation statements)

References 26 publications

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“…For exploring the dislocation density in the samples, GAM and TEM images have been used. The higher the GAM values, the higher the dislocation densities [36]. Comparison between GAM maps ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Application of nanoindentation to evaluate the hardness and yield strength of brass joints produced by FSW: microstructural and strengthening mechanisms

Heidarzadeh

Paidar

Güleryüz

et al. 2020

Archiv.Civ.Mech.Eng

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Nanoindentation test was employed to measure the actual hardness and yield strength of the stir zone in the friction stirwelded single-phase brass joints. For this aim, different joints were prepared according to an experimental matrix based on the central composite rotatable design. In this design matrix, the tool rotational speed, tool traverse speed, and tool axial force were the input parameters. The outputs were the hardness and yield strength of the joints. To measure the hardness and tensile strength of the joints, the nanoindentation test was employed. Moreover, electron back scattered diffraction and transmission electron microscopy techniques were used to study the microstructural features. The results showed that by decreasing rotational speed and axial force, and by increasing the traverse speed, the hardness and yield strength of the joints were increased. In other words, lower heat inputs caused higher strength in the joints. Finer grain sizes, larger grain average misorientation amounts, i.e., existence of more dislocations, and greater Taylor factors in the lower heat input joints revealed that the influence of grain boundaries, dislocations, and texture were the origins of better mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Application of nanoindentation to evaluate the hardness and yield strength of brass joints produced by FSW: microstructural and strengthening mechanisms

Heidarzadeh

Paidar

Güleryüz

et al. 2020

Archiv.Civ.Mech.Eng

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“…The elastic deformations for all microstructures in partial recrystallized copper are assumed to be the same. The values are achieved from experimental measurements (Li et al, 2008a;Tian et al, 2018). The material parameters for hierarchical-microstructures are obtained from the measurements in Figs.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Rapid annealing treatment after high pressure torsion was used to achieve full recrystallization in ultrafine grains, resulting in improvement of both strength and ductility (Zheng et al, 2017). To-date, the trade-off of strength and ductility has been overcome in various metallic materials by combining SPD and subsequent HT: (i) the conventional metals, including copper (Tian et al, 2018), stainless steel (El-Tahawy et al, 2018;Sun et al, 2019) and titanium (Huang et al, 2019); (ii) the new class of materials, including medium-entropy (Laplanche et al, 2017) alloy and high-entropy alloy (Sun et al, 2018;Wu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Hierarchical-microstructure based modeling for plastic deformation of partial recrystallized copper

Liu

Cai

et al. 2019

Mechanics of Materials

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Hierarchical microstructure in partial recrystallized materials can simultaneously improve the strength and ductility of metallic materials. Modeling the mechanical behavior of partial recrystallized materials helps to process materials with superior combination of ductility and strength. Here, using experimental characterization, cellular automation (CA) and finite element method, hierarchical-microstructure based modeling was proposed to simulate the tensile deformation of partial recrystallized copper. Firstly, partial recrystallized coppers with different volume fractions of recrystallization were produced by means of extrusion machining and subsequent heat treatment (HT). Uniaxial tensile tests and microstructural observations show that the hierarchical-microstructure of recrystallized grains (RGs) surrounded by elongated subgrains has a significant effect on the mechanical properties. Then, based on the experimental results, a hierarchical-microstructure based plasticity model was developed to describe the yield surface of partial recrystallized materials. CA was further employed to simulate the hierarchical microstructure. By embedding the plasticity model and simulated hierarchical-microstructure in finite element method, a finite element model (FEM) for mechanical behavior of partial recrystallized copper was proposed, where the elongated subgrain with forest dislocation and low angle grain boundary, the RG with few dislocations and twin boundary, and volume fraction of recrystallization were taken into consideration. Finally, the experimental data and the comparison with the conventional plasticity model validate the rationality of the proposed model.

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“…The Lüders band deformation is well-known to appear in low carbon ferritic steels showing discontinuous yielding due to the Cottrell atmosphere formed by impurity atoms around dislocations. In recent years, it has been shown that the Lüders bands' deformation can appear in most of the polycrystalline metals and alloys when their grain sizes are decreased down to an ultra-fine range below 1-2 µm [24][25][26][27][28][29][30][31][32]. The discontinuous yielding in UFG metals is probably because the number of mobile dislocations within each grain becomes too small to initiate the plastic deformation of the specimen in a continuous manner [28,33].…”

Section: Methodsmentioning

confidence: 99%

Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

et al. 2020

Self Cite

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Intermetallic compounds are usually considered as deleterious phase in alloy designing and processing since their brittleness leads to poor ductility and premature failure during deformation of the alloys. However, several studies recently found that some alloys containing large amounts of NiAl-type intermetallic particles exhibited not only high strength but also good tensile ductility. To clarify the role of the intermetallic particles in the excellent tensile properties of such alloys, the tensile deformation behavior of an ultrafine-grained Fe-Mn-Al-Ni-C alloy containing austenite matrix and B2 intermetallic particles was investigated by using in situ synchrotron radiation X-ray diffraction in the present study. The elastic stress partitioning behavior of two constituent phases during tensile deformation were quantitively measured, and it was suggested that B2 particles played an important role in the high strength and large tensile ductility of the material.

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Remarkable transitions of yield behavior and Lüders deformation in pure Cu by changing grain sizes

Cited by 138 publications

References 26 publications

Application of nanoindentation to evaluate the hardness and yield strength of brass joints produced by FSW: microstructural and strengthening mechanisms

Application of nanoindentation to evaluate the hardness and yield strength of brass joints produced by FSW: microstructural and strengthening mechanisms

Hierarchical-microstructure based modeling for plastic deformation of partial recrystallized copper

Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

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