Liquid-liquid phase transition in Pb-Sn melts

Zu, Fang‐Qiu; Zhu, Zhiyuan; Guo, Lu; Zhang, B.; Shui, Jiapeng; Liu, C. S.

doi:10.1103/physrevb.64.180203

Cited by 91 publications

(46 citation statements)

References 18 publications

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“…The rise of internal friction peaks was observed as the liquidliquid transition occurred. This effect was explained by the interface produced during transition [12]. It is important to emphasize that the shear modulus was not clearly changed during 'pre-solidification'.…”

Section: Resultsmentioning

confidence: 99%

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Internal Friction Of Phase Transformations Observed Around Room Temperature In Ga-In-Sn Eutectic Alloys

Jin¹,

Li²,

Ying³

et al. 2015

Archives of Metallurgy and Materials

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Tarcie wewnęTrzne przemian fazowych obserwowanych przy TemperaTurze pokojowej w euTekTycznym sTopie Ga-In-SnThe phase transformation phenomena in eutectic Ga-In-Sn alloys around room temperature are studied by thermal analysis, internal friction, and in-situ XRD methods. The results show that in addition to the solidification transformation, a novel the so-called 'pre-solidification' phase transition, demonstrating first-order feature, is observed prior to the crystallization during cooling. The internal friction increases when the 'pre-solidification' effect occurs. The shear modulus increases until crystallization. An internal friction peak is attributed to the melting process observed during heating. The mechanism of the 'pre-solidification' transformation in Ga-In-Sn eutectic alloy is discussed.Key words: Ga-In-Sn alloy, internal friction, liquid-liquid transition Zjawiska przemian fazowych w eutektycznych stopach Ga-In-Sn, około temperatury pokojowej, badane są metodami analizy termicznej, tarcia wewnętrznego i XRD in-situ. Wyniki pokazują, że w dodatku do przemiany krzepnięcia, nowa przemiana tzw. "wstępne krzepnięcie", o charakterze przemiany pierwszego rzędu, obserwowana jest przed krystalizacją podczas chłodzenia. Tarcie wewnętrzne zwiększa się, gdy występuje "wstępnie krzepnięcie". Moduł sprężystości poprzecznej zwiększa się aż do krystalizacji. Wewnętrzny pik tarcia przypisany jest do topienia obserwowanego podczas ogrzewania. Omówiono mechanizm przemiany "wstępnego krzepnięcia" w eutektycznym stopie Ga-In-Sn.

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Section: Resultsmentioning

confidence: 99%

“…Zu [11,12] investigated temperature-dependent discontinuous structural change in some binary liquids, such as In-Sn, Pb-Sn, Pb-Bi alloys by mechanical spectroscopy. The rise of internal friction peaks was observed as the liquidliquid transition occurred.…”

Section: Resultsmentioning

confidence: 99%

Internal Friction Of Phase Transformations Observed Around Room Temperature In Ga-In-Sn Eutectic Alloys

Jin¹,

Li²,

Ying³

et al. 2015

Archives of Metallurgy and Materials

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“…In our work, an improved torsion pendulum internal friction apparatus was, for the first time, used to study liquids, and it was verified to also be valid and sensitive to liquid structures [31][32][33][34][35]. The prior-prepared samples were re-melted and held for 60 min before internal friction experiments and shielded with 5N pure argon, and all experimental conditions and data collection were automatically controlled by a computer, for details of which please refer to [31][32][33].…”

Section: The Behaviors Of Internal Friction With Changing Temperaturementioning

confidence: 96%

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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“…DTA measurements of prior investigations [16,[28][29][30] showed the melts absorbed heat during LLST. This result implied that C p may decrease with LLST.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, Liu et al [27] have mentioned that in Sn--Bi melts at low temperature above the liquidus temperature there are metastable clusters that are broken with temperature rising until the melt reaches a stable state with a new liquid structure. Prior investigations have indicated that some physical parameters including thermal conductivity [28], heat capacity [16,[28][29][30] and density [28,31] are sensitive to liquid structure. It can be expected that, if the liquid structure changes its thermal diffusivity, which includes heat capacity and density, they may change.…”

Section: Resultsmentioning

confidence: 99%

Change of solidification behaviors in the superheating Sn-40wt.%Bi alloy from the viewpoint of the relaxation of properties

Ding¹,

Li²,

Chen³

2021

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The effects of melt overheating treatment on solidification of Sn-Bi alloys are studied from the viewpoint of the relaxation of properties. The results reveal that the change trends of cooling rate, undercooling degree of the primary and eutectic nucleation and maximum solidification rates of primary phase of melts not undergoing the relaxation are contrary to those of melts undergoing the relaxation. However, the change of these parameters could not explain the change on the microstructures. The present paper suggests the increasing of the apparent primary undercooling during solidification can be used to describe the refinement of primary phase after melts undergoing the relaxation. Our study may open new possibilities for the control of solidification process, which governs the microstructure, mechanical and physical properties of solids.K e y w o r d s : structural relaxation, alloys, crystal growth

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Liquid-liquid phase transition in Pb-Sn melts

Cited by 91 publications

References 18 publications

Internal Friction Of Phase Transformations Observed Around Room Temperature In Ga-In-Sn Eutectic Alloys

Internal Friction Of Phase Transformations Observed Around Room Temperature In Ga-In-Sn Eutectic Alloys

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

Change of solidification behaviors in the superheating Sn-40wt.%Bi alloy from the viewpoint of the relaxation of properties

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