Recrystallization and microstructure evolution of the rolled Mg–3Al–1Zn alloy strips under electropulsing treatment

Liu, Yang; Fan, Jianfeng; Zhang, Hua; Jin, Wei; Dong, Hongbiao; Xu, Bingshe

doi:10.1016/j.jallcom.2014.10.062

Cited by 67 publications

(22 citation statements)

References 23 publications

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“…The electropulsed sample consists of a microstructure with finer grain sizes. This phenomenon has been also observed and reported previously for several different systems of alloys [16,17]. The finer grain sizes is mainly due the higher nucleation rate caused by the electropulsing treatment during the recrystallization.…”

Section: Resultssupporting

confidence: 86%

Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

Rahnama

Qin

2015

J. Mater. Res.

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Niobium is an important alloying element in steels. In the present work an effort has been made to investigate the effect of electropulsing on the niobium carbide (NbC) at an elevated temperature (800 ºC). The results show that the electropulsing treatment can generate an evenly distributed NbC by decreasing the kinetics barriers for precipitation. It has been also found that a semi-transformed pearlite structure forms in such a way that the grains are oriented towards a direction parallel to that of the electric current flow. Furthermore, the electropulsed sample benefits from refined grain size. This is thought to be due to the electropulse-enhanced nucleation rate. Tensile testing has been carried out in order to compare the properties of electropulsed sample with that of without electropulsing. The results show that the sample with treatment has greater yield strength and ultimate tensile stress (UTS) while its elongation is only 1% less that of the unelectropulsed samples. The improved mechanical properties of the sample with pulsing are attributed to its finer grain sizes as well as the elimination of precipitation free zones (PFZs) caused by the electropulsing treatment.

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Section: Resultssupporting

confidence: 86%

Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

Rahnama

Qin

2015

J. Mater. Res.

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“…EPT has been applied to many metals and alloys to achieve ultrafine-grained microstructure and nanostructures that arise from the solid state phase transitions and the process of recovery and recrystallization during their treatment. Figure 1 shows the variation in microstructures of copper alloy, aluminium alloy, magnesium alloy, iron and steel before and after EPT [ 52 , 54 , 55 , 56 , 57 , 58 , 59 ]. In addition, the pulse current could induce the texture evolution, resulting in the formation of oriented microstructure [ 1 ].…”

Section: Effects Of Ept On Microstructure and Texturementioning

confidence: 99%

“…Besides, the LAGBs with misorientation within 2–15° were predominant (97%), and the deformed structure with ‘necking’ appeared in the primary grain before recrystallization. After EPT, new fine recrystallized grains formed, with misorientation mainly of HAGBs larger than 15° (82%) [ 56 , 65 ].…”

Section: Effects Of Ept On Microstructure and Texturementioning

confidence: 99%

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

et al. 2018

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The technology of high-density electropulsing has been applied to increase the performance of metallic materials since the 1990s and has shown significant advantages over traditional heat treatment in many aspects. However, the microstructure changes in electropulsing treatment (EPT) metals and alloys have not been fully explored, and the effects vary significantly on different material. When high-density electrical pulses are applied to metals and alloys, the input of electric energy and thermal energy generally leads to structural rearrangements, such as dynamic recrystallization, dislocation movements and grain refinement. The enhanced mechanical properties of the metals and alloys after high-density electropulsing treatment are reflected by the significant improvement of elongation. As a result, this technology holds great promise in improving the deformation limit and repairing cracks and defects in the plastic processing of metals. This review summarizes the effect of high-density electropulsing treatment on microstructural properties and, thus, the enhancement in mechanical strength, hardness and corrosion performance of metallic materials. It is noteworthy that the change of some properties can be related to the structure state before EPT (quenched, annealed, deformed or others). The mechanisms for the microstructural evolution, grain refinement and formation of oriented microstructures of different metals and alloys are presented. Future research trends of high-density electrical pulse technology for specific metals and alloys are highlighted.

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“…6b. In general, EPT can significantly reduce the dislocation density via annihilation of dislocation in heavily deformed metals and alloys [17][18]37].…”

Section: Kinetic Effects Of Electric Currentmentioning

confidence: 99%

“…From the thermodynamic point of view, the Gibbs free energy associated with the recrystallization process, especially the nucleation rate of ferrite can be influenced by EPT [14][15][16][17][18][19][20][21][22][23][24][25][26]. According to classical nucleation theory, when EPT is applied, the nucleation rate for ferrite, can be expressed as [18,24,[37][38]:…”

Section: Thermodynamic Of Electric Currentmentioning

confidence: 99%

Stability of martensite with pulsed electric current in dual-phase steels

Qin

2016

Materials Science and Engineering: A

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Softening frequently occurs in dual-phase steels under isothermal tempering of martensite.Recently, non-isothermal tempering is implemented to decrease the softening process in dualphase steels. Here, we have discovered using high power electropulsing treatment can significantly enhance the strengthening effects via the formation of ultrafine-grained ferrite with nano-cementite particles in tempered martensitic-ferritic steels. To the best our knowledge, electropulsing treatment is a proper candidate to retard even to recovery the softening problems in the tempering of martensite in comparison with other isothermal and non-isothermal tempering methods.

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Recrystallization and microstructure evolution of the rolled Mg–3Al–1Zn alloy strips under electropulsing treatment

Cited by 67 publications

References 23 publications

Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

Effect of electric current pulses on the microstructure and niobium carbide precipitates in a ferritic-pearlitic steel at an elevated temperature

Application of High-Density Electropulsing to Improve the Performance of Metallic Materials: Mechanisms, Microstructure and Properties

Stability of martensite with pulsed electric current in dual-phase steels

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