Improved cyclic softening behavior of ultrafine-grained Cu with high microstructural stability

Xue, P.; Wang, B.B.; An, X.H.; Ni, D.R.; Xiao, Bing; Ma, Z.Y.

doi:10.1016/j.scriptamat.2019.02.040

Cited by 21 publications

(8 citation statements)

References 36 publications

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“…Usually, the is nearly equal to the true tensile strength after modification with necking and b represents the degree of the fatigue damage, which is associated with the initial microstructure characteristics [26, 27]. Compare with the BM, the of the A-200 sample decreased clearly but the similar b value was obtained, so the fatigue limit was reduced to 180 MPa.…”

Section: Resultsmentioning

confidence: 99%

Achieving equal fatigue strength to base material in a friction stir welded 5083-H19 aluminium alloy joint

Wang

Xue

Xiao

et al. 2019

Science and Technology of Welding and Joining

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By using a low rotation rate of 200 rpm with additional water cooling, a friction stir welded (FSW) joint with equal fatigue strength to the base material (BM) was obtained in 5083Al-H19 rolled plates due to the significantly decreased softening and the residual stress effect. Though the hardness value in the heat affected zone (HAZ) was a little lower than that of the BM, the decreased tensile effect of the residual stress in the HAZ greatly improved the fatigue performance, which was even higher than that of the BM, so the final fracture occurred at the BM. This study provides an effective strategy to enhance the fatigue performance of the FSW joints.

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Section: Resultsmentioning

confidence: 99%

Achieving equal fatigue strength to base material in a friction stir welded 5083-H19 aluminium alloy joint

Wang

Xue

Xiao

et al. 2019

Science and Technology of Welding and Joining

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“…The inability of the multi-pass FSP to achieve significant grain refinement with constant processing parameters, has been attributed to the accumulated heat in subsequent passes [21,27]. The heat generated and strain rate, along with strain, are known to have a counteracting effect on the evolution of grain size [28,29]. Figure 7b,d show the EBSD phase maps obtained from one-pass and two-pass FSPed samples.…”

Section: Friction Stir Processed Samples: Microstructural Evolutionmentioning

confidence: 99%

“…In the annealed condition before FSP, low intensity peaks of HCP phase are observed, whereas, after performing FSP, sharp HCP peaks are seen indicating modification in the phase fractions. [29,31]. The strain mismatch is accommodated by geometrically necessary dislocations (GNDs) and the significance of KAM values lies in the fact that it is indicative of the density of the GNDs present in the microstructure.…”

Section: Friction Stir Processed Samples: Microstructural Evolutionmentioning

confidence: 99%

“…The KAM maps reflect the local mis-orientation experienced by the grains after deformation. The local misorientation is a result of strain mismatch between the different grains and different phases present in the microstructure[29,31]. The strain mismatch is accommodated by geometrically necessary dislocations (GNDs) and the significance of KAM values lies in the fact that it is indicative of the density of the GNDs present in the microstructure.…”

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confidence: 99%

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Effect of Multi-Pass Friction Stir Processing on Microstructure and Mechanical Properties of a Metastable Dual-Phase High Entropy Alloy

et al. 2022

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Studies on Multi-pass Friction Stir Processing (FSP) of Fe49.5Mn30Co10Cr10C0.5, a metastable dual-phase High Entropy Alloy (HEA), were carried out with the aim to systematically investigate the microstructural changes occurring during different passes, and to evaluate the mechanical response of this alloy with progressive passes. A reduction in grain size and a change in HCP volume fraction was observed after each pass. Dynamic recrystallization, occurring during FSP, led to grain refinement, and the transformation induced plasticity (TRIP) effect resulted in observed changes in HCP phase fraction. One-pass FSPed material exhibits a higher work hardening rate and a higher ultimate tensile strength (UTS.) value, as compared to both, an annealed and two-pass FSPed material. This is due to a combination of two factors, a small grain size and a large fraction of metastable Face Centred Cubic (FCC) phase, in the microstructure of the one-pass material.

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“…With the increasing requirements of high efficiency, high reliability and accurate application, the structure design based on the physical properties of the as-received materials become inopportune since the mechanical properties and microstructures of materials would be changed by the combined influence of environment and loadings in service, especially for the engineering materials used in the field of high temperature, large loadings or harsh environments [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution along the NiCrMoV Steel Welded Joints Induced by Low-Cycle Fatigue Damage

Weng

Huang

Zhu

et al. 2021

Metals

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The degradation of mechanical properties of materials is essentially related to microstructural changes under service loadings, while the inhomogeneous degradation behaviors along welded joints are not well understood. In the present work, microstructural evolution under low-cycle fatigue in base metal (BM) and weld metal (WM) of NiCrMoV steel welded joints were investigated by miniature tensile tests and microstructural observations. Results showed that both the yield strength and ultimate tensile strength of the BM and WM decreased after low-cycle fatigue tests, which were attributed to the reduction of dislocation density and formation of low-energy structures. However, the microstructural evolution mechanisms in BM and WM under the same cyclic loadings were different, i.e., the decrease of dislocation density in BM was attributed to the dislocation pile-ups along the grain boundaries, dislocation tangles around the carbides at the lower strain amplitudes (±0.3% or ±0.5%). Additionally, when the strain amplitude was ±8%, the dislocation density was further decreased by the formation of subgrains in BM. For WM, the dislocation density decreased with the increase of strain amplitude, which was mainly caused by the dislocation pile-ups along the grain boundaries and the formation of subgrains.

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Improved cyclic softening behavior of ultrafine-grained Cu with high microstructural stability

Cited by 21 publications

References 36 publications

Achieving equal fatigue strength to base material in a friction stir welded 5083-H19 aluminium alloy joint

Achieving equal fatigue strength to base material in a friction stir welded 5083-H19 aluminium alloy joint

Effect of Multi-Pass Friction Stir Processing on Microstructure and Mechanical Properties of a Metastable Dual-Phase High Entropy Alloy

Microstructural Evolution along the NiCrMoV Steel Welded Joints Induced by Low-Cycle Fatigue Damage

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