Effect of electric current pulses on fatigue characteristics of polycrystalline copper

Conrad, H.; White, Jerry P.; Cao, Weidi; Lü, Xiaoping; Sprecher, A.F.

doi:10.1016/0921-5093(91)90290-4

Cited by 68 publications

(27 citation statements)

References 33 publications

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“…In 1970s, Troitskii et al 20 also argued that the phenomenon could be induced by the effect of drifting electrons (electron wind) on dislocations and showed that flow stress could be reduced by using high-pulsed currents. After the work of Troitskii, the influences of continuous or pulsed electric current on mechanical properties such as flow stress, stress relaxation, creep, dislocation generation, mobility, brittle fracture, fatigue, and formability of various metals 13,[21][22][23] have been investigated. The magnitude of drifting electron-dislocation interaction under a pulsed electric current was determined in theory, 20 while Okazaki et al…”

Section: History Of Electroplasticitymentioning

confidence: 99%

A review of electrically-assisted manufacturing

Nguyen-Tran

Hong

et al. 2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

115

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The mechanical properties of metals change temporarily or permanently under application of electric currents under deformation. This phenomenon is often referred to as electroplasticity. The electroplasticity of metals and their alloys has been investigated under various loading conditions including tensile, compressive, bending, and hardness tests. Electrically-assisted manufacturing (EAM) utilizes this electroplasticity in manufacturing processes. Due to its technical advantages such as enhanced formability and reduced springback, EAM is energy efficient with reduced process time. Recent developments in EAM include various bulk deformation and sheet metal forming processes. This paper summarizes previously reported electroplastic behaviors of various metals or metal alloys and recent EAM processes. In addition, contemporary EAM patents are briefly reviewed.

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Section: History Of Electroplasticitymentioning

confidence: 99%

A review of electrically-assisted manufacturing

Nguyen-Tran

Hong

et al. 2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

115

View full text Add to dashboard Cite

show abstract

“…8) It is known that electric current in uences the mechanical properties of metals. Okazaki et al, 9) Sprecher et al, 10) Conrad et al, 11,12) and Cao 13) conducted detailed investigations of the effects of high-density current pulsing to titanium and copper alloys. Their research indicated that high-density current pulsing enhanced the movement of dislocations.…”

Section: Introductionmentioning

confidence: 99%

Delaying Effect of High-Density Electric Current on Fatigue Crack Growth in A6061-T6 Aluminum Alloy

Jung

Morita

et al. 2016

Mater. Trans.

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This study examined the delaying effect of fatigue crack growth induced by high-density electric current on A6061-T6 aluminum alloy. To investigate the effect, fatigue tests were conducted using specimens with and without electric current treatment. The fatigue life of the treated specimens increased signi cantly compared with untreated specimens. After the tests, the fracture surfaces were examined using scanning electron microscope. In the specimens in which electric current was applied, local melting on the crack surface was observed via fractography. To clarify the effects of electric current treatment on fatigue crack propagation, early crack growth was investigated using the plastic replication method. A delaying effect was particularly noticeable in the small-crack region. Results show that this delaying effect can be attributed to crack shielding caused by local melting on the crack surface, which signi es that the fatigue life is improved by the application of high-density electric current.

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“…Although the application of electric current to improve the fatigue life has been proposed, 2,3) many researchers have focused on fatigue crack healing. 4,5) However, studies regarding the effect of current application on the delay of fatigue crack growth are limited.…”

Section: Introductionmentioning

confidence: 99%

Effect of High-Density Electric Current on the Microstructure and Fatigue Crack Initiation of Stainless Steel

et al. 2013

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To investigate the effect of high-density electric current on the delay of fatigue crack initiation, the dislocation structures before and after the application of electric current were investigated by transmission electron microscopy. Dislocation density was quantitatively characterized before and after the application of electric current to further understand the mechanics of the healing effect. Atomic force microscope results showed that the slips disappeared locally and the slip height decreased on the surface of the specimens. Furthermore, the delaying effect of the crack initiation due to the application of electric current was evaluated by the fatigue crack-initiation model in which the accumulation of the dislocation density was considered.

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Effect of electric current pulses on fatigue characteristics of polycrystalline copper

Cited by 68 publications

References 33 publications

A review of electrically-assisted manufacturing

A review of electrically-assisted manufacturing

Delaying Effect of High-Density Electric Current on Fatigue Crack Growth in A6061-T6 Aluminum Alloy

Effect of High-Density Electric Current on the Microstructure and Fatigue Crack Initiation of Stainless Steel

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