Electron force-induced dislocations annihilation and regeneration of a superalloy through electrical in-situ transmission electron microscopy observations

Zhang, Xin; Li, Hongwei; Zhan, Mei; Zheng, Zebang; Gao, Jia; Shao, Guangda

doi:10.1016/j.jmst.2019.08.008

Cited by 87 publications

(15 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…20 Through electrical in-situ transmission electron microscopy, Zhang et al proved that the electron force played an important role in dislocations annihilation and regeneration. 21 Theoretical consideration of the wind force was described as follows, 11,22 where f ew /l is the force per unit length acting on the dislocations, k ew is the electron force coefficient, and J is the current density. It could be found that the force exerted on dislocations by draft electron was considered proportional to the pulse current density.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of electropulsing treatment on the recovery of AZ31B magnesium alloy

Zhang

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

Electropulsing treatment (EPT) is a potential annealing method with advantages of performance improvement and equipment simplification. In the current paper, the effect of EPT on the recovery of AZ31B magnesium alloy during a two-stage plastic deformation process was studied. The tensile properties, residual stress, microstructure, and recovery kinetics were evaluated. The residual stress decreased and the cumulative elongation increased slightly, whereas the yield strength retained relatively high after EPT. A typical recovery process was observed. Moreover, the recovery kinetics was accelerated by the improved pulse current density, which led to lower residual stress and higher cumulative elongation. Thus, satisfactory recovery can be achieved by adjusting the pulse current during EPT. Analysis of the full width at half maximum (FWHM) and kernel average misorientation (KAM) indicated that the dislocation density decreased after EPT. Therefore, the pulse current has a significant impact on the dislocation mobility and annihilation, accounting for the recovery behavior of AZ31B magnesium alloy. A model of the recovery kinetics was established to demonstrate the effect of the pulse current on recovery evolution in AZ31B magnesium alloy.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Dislocation Evolutionmentioning

confidence: 99%

Effect of electropulsing treatment on the recovery of AZ31B magnesium alloy

Zhang

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

show abstract

“…According to the two fluid models [ 40 ], the moving electrons are scattered and hindered on the dislocations. Meanwhile, the decrease in dislocation density will lead to not only the increase in effective charge density participating in the conduction, but also the enhancement of current transmission ability [ 41 ]. Therefore, the electrical conductivity of the copper foil increases with the decrease in dislocation density [ 42 ].…”

Section: Discussionmentioning

confidence: 99%

Softened Microstructure and Properties of 12 μm Thick Rolled Copper Foil

et al. 2022

View full text Add to dashboard Cite

Up to now, 12 μm thick rolled copper foil is the thinnest rolled copper foil that can be stably produced. The softened microstructure and properties of 12 μm thick rolled copper foil were systematically studied in this paper. The softened process consists of thermal treatment at 180 °C for different times. The results show that the softened annealing texture is mainly cubic texture, and the cubic texture fraction increases with the increase in annealing time. The cubic texture fraction reaches the highest (34.4%) after annealing for 60 min. After annealing for 1–5 min, the tensile strength and the bending times decrease significantly. After annealing for 10–60 min, the tensile strength tends to be stable, and the bending times increase slightly. With the increase in annealing time, the electrical conductivity increases gradually, reaching 92% International Annealed Copper Standard (IACS) after annealing for 60 min. Electrical conductivity can be used as a fast and effective method to analyze the microstructure of metals.

show abstract

“…Li [18] also investigated the DB of homogeneous AlCoCrFeNi 2.1 and the maximum of shear strength of joints reached 648 MPa with a ductile fracture at a temperature of 1050 • C. It can be seen that lots of research has mainly focused on the DB of high entropy alloy, whilst the diffusion bonding of MEAs has not yet been reported. Similarly, the powder metallurgy Ni-based superalloy (FGH98) is also widely used in engineering as the key component material due to its high yield strength and excellent oxidation resistance at elevated temperatures [19][20][21]. Therefore, considering the element similarity between Al 3 Ti 3 (CrCoNi) 94 and FGH98 and their potential application value, the reliable joining of CoCrNi-based MEAs and FGH98 to achieve the complementary advantages of both the materials is significant for their potential practical utility.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Bonding of FGH 98 and CoCrNi-Based Medium-Entropy Alloy: Microstructure Evolution and Mechanical Tests

Xiong

et al. 2021

Crystals

View full text Add to dashboard Cite

The superalloy FGH98 was successfully diffusion bonded (DB) with medium-entropy alloy (MEA) Al3Ti3(CrCoNi)94 using pure Ni as the interlayer at a temperature range of 1050–1170 °C for 1 h under 5 MPa. The microstructure and mechanical properties of joints were investigated. The diffusion bonding seam was composed of an interlayer zone (IZ) and two diffusion-affected zones (DAZ). The IZ and DAZ beside the FGH98 consisted of cubic Ni3(TiAl)-type γ′ phases due to the diffusion of Ti and Al atoms. Meanwhile, the DAZ adjacent to the MEA consisted of spherical γ′ phases. Both of the γ′ phases with different morphology kept the coherent relationship with the matrix. Moreover, increase of bonding temperature led to the morphology of interlayer γ′ phase to transform from sphere to cube. Due to the strengthening effect of a mass of γ′ phase distributed evenly in IZ and the DAZ beside the FGH98, the microhardness and Young’s modulus of these two zones were higher than that of DAZ near the MEA. The maximum shear strength of DB joint, 592 MPa, was achieved in the joint bonded by 1150 °C, which was the typical ductile fracture feature confirmed by the shear dimples.

show abstract

Electron force-induced dislocations annihilation and regeneration of a superalloy through electrical in-situ transmission electron microscopy observations

Cited by 87 publications

References 26 publications

Effect of electropulsing treatment on the recovery of AZ31B magnesium alloy

Effect of electropulsing treatment on the recovery of AZ31B magnesium alloy

Softened Microstructure and Properties of 12 μm Thick Rolled Copper Foil

Diffusion Bonding of FGH 98 and CoCrNi-Based Medium-Entropy Alloy: Microstructure Evolution and Mechanical Tests

Contact Info

Product

Resources

About