Effects of dynamic electropulsing on microstructure and elongation of a Zn–Al alloy

Zhu, Yaohua; To, Suet; Lee, Wing Bun; Liu, X.M.; Jiang, Yong; Tang, Guoyi

doi:10.1016/j.msea.2008.09.080

Cited by 156 publications

(56 citation statements)

References 19 publications

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“…3(a) and (b), respectively. 5,20) Lattice parameters of the five phases involved in the above mentioned phase transformations:…”

Section: (B)mentioning

confidence: 99%

“…T and T 0 , were determined using TEM examination 5,20) and listed in Table 2. It is noticed that the two phases: 0 S and 0 T are of the same hcp microstructure, the c=a of which is 1.818 and 1.837, respectively.…”

Section: (B)mentioning

confidence: 99%

“…This implied that the reverse phase transformation: Fig. 3 TEM bright field images of (a) a static 20) and (b) and a dynamic 5) EPT ZA alloy (ZA22) to show phase transformations: Table 2 The lattice parameters for EBSD mapping deduced by TEM. 4.…”

Section: (B)mentioning

confidence: 99%

“…1) As an alternative to the traditional thermal and thermo-mechanical processes, EPT has attracted a great deal of attention. Extensive studies have been carried out in materials science and engineering, such as electroplastisity, [1][2][3][4][5][6] electromigration, 7,8) recrystallization, [9][10][11][12] amorphous nanocrystallization 13,14) and phase transformation. [15][16][17][18][19][20][21][22][23][24] As a new kind of driving force for phase transformations, electropulsing is more powerful and more effective than thermal and thermo-mechanical energies.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamic Electropulsing Induced Phase Transformations in a Furnace Cooled Zn-Al Based Alloy (ZA22)

Zhu

Lee

et al. 2010

Mater. Trans.

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Multi-phase identification and phase transformations in a dynamic electropulsing treated Zn-Al based alloy (ZA22) were studied by using backscattered scanning electron microscopy (BSEM) and electron back-scattered diffraction techniques (EBSD). By using EBSD, two hcp phases S (in a way of upquenching), were detected. It was found that dynamic electropulsing was less effective in accelerating phase transformations than static electropusling. The mechanism of dynamic electropulsing induced phase transformations is discussed from the point view of Gibbs free energy and electropulsing kinetics.

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“…3(a) and (b), respectively. 5,20) Lattice parameters of the five phases involved in the above mentioned phase transformations:…”

Section: (B)mentioning

confidence: 99%

Section: (B)mentioning

confidence: 99%

Section: (B)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic Electropulsing Induced Phase Transformations in a Furnace Cooled Zn-Al Based Alloy (ZA22)

Zhu

Lee

et al. 2010

Mater. Trans.

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“…[7][8][9][10] Previous studies reported that electropulsing tremendously accelerated phase transformations by a factor of at least 6000 times, compared with that achieved in the normal ageing process. 4 It was also reported that with adequate electropulsing, the elongation of a Zn-Al-based alloy (ZA22) was increased by 437% at ambient temperature under a high strain rate, whereas the instantaneous tensile stress remained unchanged, compared with that of the non-EPT alloy.…”

Section: Introductionmentioning

confidence: 99%

Static electropulsing-induced phase transformations of a cold-deformed ZA27 alloy

Zhu

Liu

et al. 2011

J. Mater. Res.

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Static electropulsing-induced phase transformations of a cold-drawn ZA27 alloy wire were studied by using x-ray diffraction, backscattered scanning electron microscopy, and electron backscattered diffraction (EBSD) techniques. By using EBSD, phases with close microstructure are discriminated, based on transmission electron microscopy determined lattice parameters of phases. Thus, it was quantitatively detected that electropulsing tremendously accelerated phase transformations in two stages: (i) g9 S and e9 T decomposed sequentially (in a way of quenching) and (ii) e9 T and g9 S formed via reverse decompositions (in a way of up-quenching).

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Sintering Mechanisms of Metals Under Electric Currents

Monchoux¹

2019

Spark Plasma Sintering of Materials

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This chapter concerns the microscopic mechanisms involved in densification of metallic powders submitted to high electric current pulses like in the SPS technique. Because metallic systems exhibit high electric conductivity, focus is made on evaluating the sensitivity of the densification mechanisms on the current. Thus, a first part is devoted to the influence of electric currents on elementary metallurgical phenomena (diffusion, plasticity…) which are involved in densification. Then, after recalling the micromechanical models of densification, the SPS kinetics is described, and analyzed in the framework of these models, with emphasis on the role of the current. Finally, theoretical and experimental investigations on electrically-induced mechanisms at the scale of the powder particle contacts, are presented: dielectric breakdown of oxide layers, arcs and plasma, Joule overheating, electroplasticity and electromigration. Then, conclusions are drawn on the most probable mechanisms, and on the role of the current.

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Effects of dynamic electropulsing on microstructure and elongation of a Zn–Al alloy

Cited by 156 publications

References 19 publications

Dynamic Electropulsing Induced Phase Transformations in a Furnace Cooled Zn-Al Based Alloy (ZA22)

Dynamic Electropulsing Induced Phase Transformations in a Furnace Cooled Zn-Al Based Alloy (ZA22)

Static electropulsing-induced phase transformations of a cold-deformed ZA27 alloy

Sintering Mechanisms of Metals Under Electric Currents

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