Structural relaxation in amorphous Fe40Ni40P14B6alloy studied by positron annihilation

Mihara, T.; Otake, Shuichi; Fukushima, Hiroshi; Doyama, Masao

doi:10.1088/0305-4608/11/3/018

Cited by 26 publications

(4 citation statements)

References 17 publications

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“…Fig. 5a reported earlier [21,22] in the case of metallic glass Fe,,Ni,,P,,B,. However, Doyama et al [22] have attributed their deduced relaxation time to the process involving the shrinkage of Bernal holes.…”

Section: Isothermal Annealing Study Of Vicalloysupporting

confidence: 66%

Structural Relaxation and Crystallization of Metallic Glasses Fe35Co52V13 and Fe45Co45V6Ni4

Sreeramalu

Ravindrachary

Sreepad

et al. 1990

phys. stat. sol. (a)

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Section: Isothermal Annealing Study Of Vicalloysupporting

confidence: 66%

Structural Relaxation and Crystallization of Metallic Glasses Fe35Co52V13 and Fe45Co45V6Ni4

Sreeramalu

Ravindrachary

Sreepad

et al. 1990

phys. stat. sol. (a)

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“…Positron annihilation studies have been frequently used to study structural relaxation (see, for example, the early review of Chen, 1983). Mihara et al (1981) attribute changes in the Doppler-broadened line shape observed upon annealing Fe 40 Ni 40 P 14 B 6 below the crystallization temperature to the loss of excess volume of the as-quenched sample.…”

Section: Conventional Metallic Glassesmentioning

confidence: 90%

Diffusion in Metallic Glasses and Supercooled Melts

Faupel

Rätzke

2005

Diffusion in Condensed Matter

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Amorphous metallic alloys, also called metallic glasses, are of considerable technological importance. The metastability of these systems, which gives rise to various rearrangement processes at elevated temperatures, calls for an understanding of their diffusional behavior. From the fundamental point of view, these metallic glasses are the paradigm of dense random packing. Since the recent discovery of bulk metallic glasses it has become possible to measure atomic diffusion in the supercooled liquid state and to study the dynamics of the liquid-to-glass transition in metallic systems. In the present article the authors review experimental results and computer simulations on diffusion in metallic glasses and supercooled melts. They consider in detail the experimental techniques, the temperature dependence of diffusion, effects of structural relaxation, the atom-size dependence, the pressure dependence, the isotope effect, diffusion under irradiation, and molecular-dynamics simulations. It is shown that diffusion in metallic glasses is significantly different from diffusion in crystalline metals and involves thermally activated, highly collective atomic processes. These processes appear to be closely related to low-frequency excitations. Similar thermally activated collective processes were also found to mediate diffusion in the supercooled liquid state well above the caloric glass transition temperature. This strongly supports the mode-coupling scenario of the glass transition, which predicts an arrest of liquidlike flow already at a critical temperature well above the caloric glass transition temperature. CONTENTS

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“…The reversible effect was ascribed to CSRO, while the non-reversible effect was assigned to TSRO. The TSRO is usually related to the loss of excess free volume in the as-quenched amorphous alloy [11]. The origin of the CSRO ordering is not clear.…”

Section: The Positron Lwetime -The Results Of the Lifetime Measurements (Tablementioning

confidence: 99%

Study of transformation kinetics in the Fe40Ni38Mo4B18 metallic glass by positron annihilation methods

Mbungu-Tsumbu

Segers

Dorikens

et al. 1985

Rev. Phys. Appl. (Paris)

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We report on transformations induced in the metallic glass Fe40Ni 38Mo4B18 by thermal treatments from the amorphous to the crystallized state, following the variation of the positron lifetime and the Doppler broadening of the annihilation line. The behaviour of the annihilation lineshape shows reversible and non-reversible contributions. We suggest the reversible part to be related to the changes induced by thermal expansion. The non-reversible variation chiefly shows phase transitions. Crystallization of the sample appears as a three-stage process. The results support the idea that positrons are trapped in the as-received metallic glass

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Structural relaxation in amorphous Fe₄₀Ni₄₀P₁₄B₆alloy studied by positron annihilation

Cited by 26 publications

References 17 publications

Structural Relaxation and Crystallization of Metallic Glasses Fe35Co52V13 and Fe45Co45V6Ni4

Structural Relaxation and Crystallization of Metallic Glasses Fe35Co52V13 and Fe45Co45V6Ni4

Diffusion in Metallic Glasses and Supercooled Melts

Study of transformation kinetics in the Fe40Ni38Mo4B18 metallic glass by positron annihilation methods

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