Effect of pulsed electric current on dissolution of Mg 17 Al 12 phases in as-extruded AZ91 magnesium alloy

Jeong, Hye-Jin; Kim, Moon-Jo; Park, Ju-Won; Yim, Chang Dong; Kim, Jae Joong; Kwon, Oh Duck; Madakashira, Phaniraj; Han, Heung Nam

doi:10.1016/j.msea.2016.12.103

Cited by 67 publications

(13 citation statements)

References 32 publications

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“…It is implied that EPT substantially decreased the thermodynamic barrier and then decreased the apparent solid temperature of the β phase in the AZ91 strip. Jeong et al observed that the precipitation of the β-Mg 17 Al 12 phase was significantly inhibited, and even its dissolution into the α-Mg matrix was accelerated at relatively lower temperatures (~530–608 K), rather than the 673–993 K required under conventional heat treatment [ 88 ].…”

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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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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“…In this study, the maximum temperature rising rate due to applying electric current is 6.5 × 10 −3 Ks −1 , so the Joule heating is negligible. Similarly, experimental results also show that the dissolution rate of β ‐Mg 17 Al 12 phase in aged Mg–9Al–1Zn alloy can be enhanced by pulsed electric current …”

Section: Research Progress In Particle Reconfigurationmentioning

confidence: 67%

“…Our aim was to introduce an extra free energy term into the system so that the particles configuration can be controlled. Of course, the plastic deformation under electropulsing is also a hot research topic, this is not the focus of this review. In addition, some difficulties are highlighted here because the understanding on electropulsing processing is limited.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Particle Reconfiguration in the Metallic Materials under the Pulsed Electric Current

Zhang

Qin²

2018

steel research int.

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The dissolution, refinement, and separation of the particles are one of the core metallurgical processes to control the quality of metallic materials. The dimensional changes and controlled motion of the particles have attracted great attention due to their important contribution to the corrosion resistance, service life, and mechanical properties of metallic materials. In general, the dimensional change of the precipitates is controlled by heat treatment, while the separation or modification of the inclusions is completed by means of filtration, argon blowing, and Ca addition. Sometimes, these methods are inefficient and cannot meet the in situ operation requirement in a particular working environment. This study aims to introduce a new idea of electropulsing metallurgy to achieve direct control for the particles, and this technique is efficient and green. The production of high‐quality steels is achieved by the refinement and separation purification of the inclusions. The regeneration of the aged stainless steel used in nuclear power plant is obtained by the dissolution of precipitates. Therefore, electropulsing metallurgy provides a new technique to control the particle morphology and meets the needs for clean smelting purification and high‐performance metallic materials fabrication. If substantive progress is to be made in this field, some difficulties are highlighted here because the understanding on electropulsing processing is limited.

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“…Although the EPT has been widely investigated to improve properties of metallic materials, such as carbon steel, [32] magnesium alloy, [33] aluminum alloy, [34] titanium alloy, [35] and brass, [36] few studies [37] have been conducted on the effects of the EPT on the mechanical properties and microstructure of WC-15Co. Furthermore, the effects of the EPT on the properties and microstructure of materials remain unclear because of the complex modification mechanism.…”

Section: Introductionmentioning

confidence: 99%

Effects of Electropulsing Treatment on Microstructure and Properties of Cemented Carbide (WC-15Co)

Liao

Yang

et al. 2020

Metall Mater Trans A

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Electropulsing treatment (EPT) is a promising postprocessing method to optimize microstructure. In the present work, the EPT was applied to treat cemented carbide (WC-15Co). The electropulse-induced microstructural evolution in WC-15Co was investigated. Compared with the untreated sample, the transverse rupture strength and electrical resistance of the treated sample were reduced. However, there was no significant change in the scanning electron microscopy (SEM) microstructure. Therefore, electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) were carried out to detail the microstructural evolution. This process revealed that electropulsing could promote the recrystallization and the transition of e-Co to a-Co, as well as the evolution of microstructure. In addition, the dislocations in the treated sample were significantly fewer than those in the untreated sample.

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Effect of pulsed electric current on dissolution of Mg 17 Al 12 phases in as-extruded AZ91 magnesium alloy

Cited by 67 publications

References 32 publications

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

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

Exploring the Particle Reconfiguration in the Metallic Materials under the Pulsed Electric Current

Effects of Electropulsing Treatment on Microstructure and Properties of Cemented Carbide (WC-15Co)

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