Microheterogeneity of liquid metallic solutions and its influence on the structure and properties of rapidly quenched alloys

Popel, P. S.; Сидоров, В. Е.

doi:10.1016/s0921-5093(96)10624-9

Cited by 66 publications

(50 citation statements)

References 29 publications

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“…In developing semiconductors, the melt thermal history was shown to have a decisive influence on defect formation (twins) during crystallization and quality of ZnSe-based blue light-emitting laser diodes [18,19]. The microstructure of amorphous alloys is found to be much more homogeneous if precursor melts are much over-heated [20,21]. In order to refine solidified crystals, various techniques, like melt overheating and melt thermal treatment, have been explored and sometimes proved to be quite effective [22][23][24][25][26].…”

Section: Open Accessmentioning

confidence: 99%

Temperature-Induced Liquid-Liquid Transition in Metallic Melts: A Brief Review on the New Physical Phenomenon

2015

Metals

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Understanding the nature of liquid structures and properties remains an open problem for many fundamental and applied fields. It is well known that there is no other defined phase line above liquidus (TL) in phase diagrams of ordinary alloys. However, via resorts of internal friction, electric resistivity, thermal analysis, X-ray diffraction, solidification, etc., the results of our research on lots of single-and multiple-component melts show a novel physical image: temperature induced liquid-liquid structure transition (TI-LLST) can occur above TL. Moreover, the solidification behaviors and structures out of the melts that experienced TI-LLST are distinct from those out of the melts before TI-LLST. In this paper, some typical examples of TI-LLST and characteristic aspects of the TI-LLST are briefly reviewed, in which the main contents are limited in our own achievements, although other groups have also observed similar phenomena using different methods. In the sense of phenomenology, TI-LLST reported here is quite different from other recognized liquid transitions, i.e., there are only a few convincing cases of liquid P, Si, C, H2O, Al2O3-Y2O3, etc. in which the transition occurs, either induced by pressure or at a supercooled state and near liquidus.

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Section: Open Accessmentioning

confidence: 99%

Temperature-Induced Liquid-Liquid Transition in Metallic Melts: A Brief Review on the New Physical Phenomenon

2015

Metals

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“…This effect can be attributed to the dissolution of atom clusters present in the melt at the superheat temperature. According to Pople and Sidorov [11], if the superheat temperature is high enough for the atom clusters to dissolve fully in the melt, the cooling rate should have no effect on the eutectic Si particle characteristics in the microstructure. However, by comparing Figs.…”

Section: Resultsmentioning

confidence: 99%

“…The effect of cooling rate on the Si particle characteristics in Al-Si alloys has been investigated by many researchers [11][12][13][14]. In the present study, the A356.2 alloy melts subjected to different modification methods were cast into end-chilled molds that provided a range of cooling rates in the same casting, along the height of the casting block.…”

Section: Resultsmentioning

confidence: 99%

Effect of Melt Thermal Treatment on Eutectic Silicon Particles Characteristics in Cast Al-Si-Mg Alloys

Kahtani

2013

AMSA

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Abstract-A new means of obtaining fine Si particles is through the use of a melt thermal treatment (MTT), where the mixing of low and high temperature alloy melts produces a fine Si structure. Modification is achieved by nuclei resulting from the degeneration of large atom clusters and some refractory solids in the low temperature melt when it is heated by the high temperature melt. This is a relatively recent technique which demonstrates promise as an alternative to Sr-modification, as it requires no element addition, thus reducing the risk of increased porosity normally associated with the addition of strontium to the melt. The use of melt superheat is also found to produce refinement of the eutectic Si structure. In this case, the high melt temperature assists in the degeneration of atom clusters, providing more nuclei for α-Al dendrite formation, and a resulting refinement of the microstructure.

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“…The effect of temperature in preparing the melt before casting, which is aimed at creating an amorphous structure in iron-based alloys, was investigated in a number of works [2][3][4][5][6]. It was shown that with increasing the temperature of the melt before casting the ribbon becomes more plastic, its electrical resistance and crystallization temperature grow, and its density lowers.…”

Section: Introductionmentioning

confidence: 99%

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy

2017

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Abstract. Temperature dependences of the kinematic viscosity of a multicomponent Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 melt have been studied. A critical temperature is detected above which the activation energy of the melt' viscous flow changes. Comparison of the temperature dependences of the kinematic viscosity of the melts prepared from the initial ingot and an amorphous ribbon shows that the melt viscosity essentially depends on the initial structural state of the alloy. In amorphous ribbon produced in the mode with overheating, and the melt is above the critical temperature, the enthalpy of crystallization grows; the following heat treatment results in an increase in magnetic permeability.

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Microheterogeneity of liquid metallic solutions and its influence on the structure and properties of rapidly quenched alloys

Cited by 66 publications

References 29 publications

Temperature-Induced Liquid-Liquid Transition in Metallic Melts: A Brief Review on the New Physical Phenomenon

Temperature-Induced Liquid-Liquid Transition in Metallic Melts: A Brief Review on the New Physical Phenomenon

Effect of Melt Thermal Treatment on Eutectic Silicon Particles Characteristics in Cast Al-Si-Mg Alloys

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy

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Microheterogeneity of liquid metallic solutions and its influence on the structure and properties of rapidly quenched alloys

Cited by 66 publications

References 29 publications

Temperature-Induced Liquid-Liquid Transition in Metallic Melts: A Brief Review on the New Physical Phenomenon

Temperature-Induced Liquid-Liquid Transition in Metallic Melts: A Brief Review on the New Physical Phenomenon

Effect of Melt Thermal Treatment on Eutectic Silicon Particles Characteristics in Cast Al-Si-Mg Alloys

Melt Viscosity of the Soft Magnetic Nanocrystalline Fe72.5Cu1Nb2Mo1.5Si14B9Alloy

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Melt Viscosity of the Soft Magnetic Nanocrystalline Fe_72.5Cu₁Nb₂Mo_1.5Si₁₄B₉Alloy