Effects of passing electric current on structural relaxation, crystallization and elastic property in amorphous Cu50 Ti50

Takemoto, R.; Mizubayashi, H.

doi:10.1016/0956-7151(94)00354-k

Cited by 35 publications

(29 citation statements)

References 36 publications

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“…After electric current passing by, state 1 is left at high free energy state but unable to transform into the lower free energy state 0 because of the high kinetic barrier at low temperature. The kinetic barrier is much lower during the passing of high density electric current according to the previous experimental observations [ [14][15][16][17].…”

Section: Resultsmentioning

confidence: 54%

“…The general conclusion after all of those calculations is that the passing electric current promotes the formation and growth of phase with higher electrical conductivity. Kinetically, it has been found that passing electric current can accelerate microstructure transformation [7,14] and decrease the transition starting temperature [15][16][17]. Recently, Samuel et al reported the electropulsing-accelerated spheroidization of cementite plates in deformed pearlitic steels [18].…”

Section: Introductionmentioning

confidence: 99%

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Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

2011

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Passing one electric-current pulse through deformed pearlitic steel wires at room temperature causes the formation of cementite particles around 30 nm in size. This is found not only in some particular locations but throughout the cementite area, which reveals a different mechanism from traditional spheroidization of cementite plates because the latter leads to the formation of particles with much large size. Transmission electron microscopy images show electropulse-induced strain relief and formation of fine precipitations. Differential scanning calorimetry analysis demonstrates the additional stored free energy by electropulsing treatment. The raised free energy accounts the increased interface area in finer microstructure of materials. The experiment evidences that the passing electric current in metal has alternated the free energy sequence of various microstructures in comparison with that of current-free system.

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Section: Resultsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

2011

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“…Mizubayashi et al [18][19][20][21][22][23][24] have investigated effects of passing electric current on the structural relaxation and crystallization of some kinds of amorphous alloys, which shows that crystallization is very much accelerated by the electropulsing far below the normal crystallization temperature without the pulsing. Recently, elastic and anelastic properties of Zr 55 Al 10 Ni 5 Cu 30 25) and Pd 40 Ni 40 P 20 26) bulk metallic glasses around T g have been studied with the electromagnetic acoustic resonance (EMAR) method within the frequency range of 300-1500 kHz.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-Induced Structural Anomaly of Supercooled Liquid in Some Bulk Metallic Glasses

et al. 2004

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We have studied the elastic and anelastic behavior of fully structural-relaxed Pd 40 Ni 40 P 20 and Zr 55 Al 10 Ni 5 Cu 30 bulk metallic glasses using high-frequency ultrasound vibrations at elevated temperature, and found that the structural anomaly is induced by ultrasound vibrations in a supercooled liquid region. The electromagnetic acoustic resonance and resonant ultrasound spectroscopy methods were employed to measure the resonant spectra and ultrasonic attenuation coefficients. When the glassy samples are subjected to sub/low-MHz ultrasound vibrations during heating process, the crystallization is accelerated around their glass transition temperatures, and with this abrupt structural change, irregular Ã-shaped internal friction peaks appear. From the standpoint of ultrasonic echography, the glass transition and crystallization temperatures are considerably lowered by ultrasound vibrations in the present measurements.

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“…After the consideration, one may expect that the dynamic Young's modulus at a low strain amplitude shows an increase by an electric current instead of an increase in the strain amplitude because an electric direct-current may induce the internal stress due to the concentration of electromigration force associated with a collective motion of many atoms. Experimentally, it was observed for a-Cu 50 Ti 50 , 6,18) that the dynamic Young's modulus at the strain amplitude of 10 À6 and around 10 2 Hz showed an increase by passing an electric direct-current of 10 7 A/m 2 . We assumed that the increase in the dynamic Young's modulus by the electric direct-current is caused by the internal stress due to the concentration of electromigration force associated with a collective motion of many atoms.…”

Section: Introductionmentioning

confidence: 99%

“…3) For amorphous (a-) Cu 50 Ti 50 , a-Cu 50 Zr 50 and a-(Zr 70 -Cu 30 ) 92:5 Al 7:5 , an electric direct-current of 10 7 A/m 2 caused a decrease in the crystallization temperature, T x , by 10 to 20 K and the enhancement of the homogeneous nucleation process was observed. [4][5][6][7] Since the effective charge number to explain such enhancement of atomic diffusion by the electromigration force induced at an electric direct-current of 10 7 A/m 2 was the order of 10 6 , the concentration of the electromigration force through a collective motion of many atoms was claimed to enhance atomic diffusion. [4][5][6][7] For FeSi-B amorphous alloys, repetition of electric square pulses of 10 9 A/m 2 with about 0.1 ms duration for one hour, a total of a few seconds for passing current, brought about a decrease in the crystallization temperature by 150 to 170 K, where enhancement of atomic diffusion by the stochastic resonance was claimed to take place.…”

Section: Introductionmentioning

confidence: 99%

Transformation to Nanocrystallites in Amorphous Alloys Induced by Resonant Electropulsing

2005

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The electropulsing-induced low temperature crystallization (e-LTC) of marginal amorphous (a-) alloys, a-Cu 50 Ti 50 and a-Pd 80 Si 20 , and a bulk amorphous alloy, a-Zr 60 Cu 30 Al 10 , was investigated by electropulsing at room temperature (RT) and in liquid nitrogen (LN 2 ). Electropulsing was made by means of discharge of a condenser which is characterized by the initial current density, i d0 , and the decay time, , where the frequency of the principal constituent Fourier component of the electropulsing is 1=2. The range of i d0 was between 10 8 and 10 10A/m 2 and that of was between 0.1 and 20 ms. For all the amorphous alloys, the e-LTC took place during single electropulsing with i d0 beyond the threshold current density, i d0,c , where i d0,c was a function of . The maximum specimen temperature during the e-LTC was, e.g., 200 K for electropulsing in LN 2 , indicating that the e-LTC is associated with an athermal process, the resonant collective motion of the relatively high density region here. The dependence of i d0,c on found for electropulsing in LN 2 showed good agreement with that observed at RT, indicating that the density fluctuation responsible for the e-LTC was that frozen at the glass transition temperature. The transmission electron microscopy observation revealed that crystallites formed by the e-LTC showed crystallographic alignment with each other, suggesting that the transformation of the relatively high density regions to a crystalline phase took place. The underlying mechanism of the e-LTC was discussed.

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Effects of passing electric current on structural relaxation, crystallization and elastic property in amorphous Cu50 Ti50

Cited by 35 publications

References 36 publications

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

Electropulse-induced cementite nanoparticle formation in deformed pearlitic steels

Ultrasound-Induced Structural Anomaly of Supercooled Liquid in Some Bulk Metallic Glasses

Transformation to Nanocrystallites in Amorphous Alloys Induced by Resonant Electropulsing

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