Electric field modification during superplastic deformation of 15 vol% SiCp/LY12 Al composite

Li, Miaoquan; Chen, Yanyun; Dengjun, Chen

doi:10.1016/s0924-0136(97)00235-5

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…[19] The effects of a field on the volume fraction of cavities are shown in Fig. [19] The effects of a field on the volume fraction of cavities are shown in Fig.…”

Section: Effects Of Electric Fields On Deformation Of Metalsmentioning

confidence: 98%

The Effects of Electric Currents and Fields on Deformation in Metals, Ceramics, and Ionic Materials: An Interpretive Survey

Antolovich

Conrad²

2004

Materials and Manufacturing Processes

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The experimental and theoretical results of 50 years of research on the effects of electrical fields on deformation at high and low temperatures are reviewed. Application of currents to metals above a threshold in the range of about 3 Â 10 2 to about 3 Â 10 3 amp/cm 2 (depending on material) increases the strain rate (i.e., decreases the stress). Above that threshold, the relationship between current density and strain rate is log-linear with a slope of about 3, independent of material. Many of the experiments were done in a ''pulsed'' mode to reduce Joule heating. The amount of Joule heating was measured and analytically eliminated from the results. Careful analysis of the data showed that the major effect of a field was to increase the frequency term _ o . Reductions in the activation enthalpy and energy reductions due to the wind force were modest in terms of their effect on increasing the strain rate. The wind force on dislocations may be viewed as resulting from drift of the electron cloud; at low dislocation velocities the effect is

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“…[19] The effects of a field on the volume fraction of cavities are shown in Fig. [19] The effects of a field on the volume fraction of cavities are shown in Fig.…”

Section: Effects Of Electric Fields On Deformation Of Metalsmentioning

confidence: 98%

The Effects of Electric Currents and Fields on Deformation in Metals, Ceramics, and Ionic Materials: An Interpretive Survey

Antolovich

Conrad²

2004

Materials and Manufacturing Processes

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“…Dippon et al [4] performed orthogonal cutting tests and developed a model to express the cutting forces as functions of cutting constants, tool geometry and uncut chip area to predict the cutting forces on the MDF surface when machining with tools having complex geometry such as router bits. Gaitonde et al [5,6] conducted the drilling tests on MDF panel and found that increase in feed rate at lower cutting speeds increases the delamination factor and concluded that the most dominant factors are the cutting speed and feed rate values. Lin et al [7] studied the machinability of MDF disc and observed that the surface roughness and deformation was small in the high-density MDF disc than the low-density disc.They concluded that the most dominant control factor which influences the machinability was board density.…”

Section: Introductionmentioning

confidence: 99%

Thrust Force Studies in Drilling of Medium Density Fiberboard Panels

Valarmathi

Palanikumar²,

Sekar³

2012

AMR

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Medium density fiberboard (MDF) is an engineered wood generally used in wooden industries. Drilling is the most frequently used machining operation in the assembly of furniture working. During drilling cutting forces are developed. These cutting forces are affecting the surface qualities and also causes delamination damage. The cutting conditions and the process parameters play an important role in controlling the cutting forces. The objective of this work is to study the influence of cutting parameters such as spindle speed, feed rate and point angle to reduce the cutting forces developed during drilling. Drilling tests are conducted using Taguchi design of experiments. The mathematical model is developed using response surface methodology (RSM) to evaluate the influence of spindle speed, feed rate and point angle on thrust force. It is seen that high spindle speed with low feed rate combination gives better results in drilling of MDF panels.

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“…Similar effects of an electric field were obtained The Al 2 O 3 starting material was the same reactive-grade during the SPD of an Al-SiC particulate composite. [6] In powder doped with ϳ300 ppm MgO used in the studies in the contrast to the reduction in flow stress during SPD of the companion article. [15] Dog-bone shaped tensile specimens Al alloys, an electric field reduced the creep rate (i.e., (Figure 1) with gage dimensions of 14 ϫ 3.4 ϫ 2 mm were increased the flow stress) during SPD of the Zn-5 wt pct fabricated from the spray-dried powder by dry pressing (207 Al alloy.…”

Section: Introductionmentioning

confidence: 99%

Influence of an electric field on the plastic deformation of fine-grained Al2O3

Campbell

Fahmy

Conrad

1999

Metall Mater Trans A

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The influence of an electric field E ϭ 300 V/cm on the plastic deformation at 1450 ЊC to 1600 ЊC of fine-grained alumina with ϳ300 ppm MgO and d o ϭ 1.4 to 2.5 m was investigated. After removal of the effect of Joule heating, the field reduced the flow stress by ϳ4 MPa relatively independent of temperature, representing a 25 to 70 pct reduction in the flow stress. The field had no effect on the stress exponent n ϭ 2.2, nor on the grain size exponent p ϭ 1.9. It did however have an appreciable effect on the combined constant AD o of the Weertman-Dorn equation and the activation energy Q. The latter increased from 492 kJ/mole without the field (typically that for Al 3ϩ ion lattice diffusion) to 880 to 1070 kJ/mole with the field, which is more typical of sub-boundary or grain boundary diffusion of either Al 3ϩ or O 2Ϫ -ions in alumina. It therefore appears that the field changed the ratecontrolling, grain boundary sliding accommodation mechanism from the lattice diffusion of Al 3ϩ ions to either sub-boundary or grain boundary diffusion of Al 3ϩ or O 2Ϫ -ions. The electric field caused isotropic swelling of the specimen when applied for an extended period of time without application of stress. Pores responsible for the swelling occurred along the grain boundaries. They may have resulted from electrotransport of Al 3ϩ ions, leaving behind an Al-deficient layer from which free oxygen bubbles formed along the grain boundaries. Electric field-enhanced gas reactions at the pores may have also contributed to the swelling. It is proposed that swelling due to electrotransport may possibly be avoided by the addition of solutes, which increase the electronic or oxygen ion conductivity transference numbers compared to the aluminum ions.

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Electric field modification during superplastic deformation of 15 vol% SiCp/LY12 Al composite

Cited by 7 publications

References 6 publications

The Effects of Electric Currents and Fields on Deformation in Metals, Ceramics, and Ionic Materials: An Interpretive Survey

The Effects of Electric Currents and Fields on Deformation in Metals, Ceramics, and Ionic Materials: An Interpretive Survey

Thrust Force Studies in Drilling of Medium Density Fiberboard Panels

Influence of an electric field on the plastic deformation of fine-grained Al2O3

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