Assessment of Temperature and Pressure Dependence of Molar Volume and Phase Diagrams of Binary Al&amp;ndash;Si Systems

Liu, Xuantong; Oikawa, Katsunari

doi:10.2320/matertrans.maw201407

Cited by 14 publications

(6 citation statements)

References 59 publications

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“…The semiempirical models are, at their foundation, based on Vegard's Law. Some of the binary solid solutions in aluminium that have been investigated by CALPHAD include Al-Ni ( 446), Al-Li (447), Al-Mg (447) and Al-Si (447,448).…”

Section: Lattice Parametersmentioning

confidence: 99%

The Crystallography of Aluminum and Its Alloys

Nakashima

2019

Encyclopedia of Aluminum and Its Alloys

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This article begins with pure aluminum and a discussion of the form of the crystal structure and different unit cells that can be used to describe it. Measurements of the face-centered cubic lattice parameter and thermal expansion coefficient in pure aluminum are reviewed and parametrizations are given which allow the reader to evaluate them across the full range of temperatures where aluminum is a solid. A new concept called the “vacancy triangle” is introduced and demonstrated as an effective means for determining vacancy concentrations near the melting point of aluminum. The Debye–Waller factor, quantifying the thermal vibration of aluminum atoms in pure aluminum, is reviewed and parametrized over the full range of temperatures where aluminum is a solid. The nature of interatomic bonding and the history of its characterization in pure aluminum are reviewed with the unequivocal conclusion that it is purely tetrahedral in nature. The crystallography of aluminum alloys is then discussed in terms of all of the concepts covered for pure aluminum, using prominent alloy examples. The electron density domain theory of solid-state nucleation and precipitate growth is introduced and discussed as a new means of rationalizing phase transformations in alloys from a crystallographic point of view.

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Section: Lattice Parametersmentioning

confidence: 99%

The Crystallography of Aluminum and Its Alloys

Nakashima

2019

Encyclopedia of Aluminum and Its Alloys

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“…Figure 1(b) compares the calculated Al–Si phase diagram of present work with calculation results from literature at the pressure of 1 GPa [28, 29]. Shcmitz et al [28] measured the temperature and pressure dependent molar volume first and then integrated the term ( P – P 0 ) V to calculate Gibbs energy under pressure.…”

Section: Resultsmentioning

confidence: 74%

Effect of pressure on solidification cracking susceptibility of Al–Si alloys

Liu

Zeng

et al. 2019

Science and Technology of Welding and Joining

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An approach was developed to calculate the crack susceptibility under various levels of pressure, and the corresponding numerical method was presented. The binary Al-Si alloy system was selected for study because the effect of high pressure on its phase diagram has been reported. The results showed a higher pressure can lead to a higher crack susceptibility and shift the most crack susceptible composition to higher solute contents. It was found a higher pressure can increase the effect of back diffusion on the solidification path and hence the crack susceptibility. This study provides a new understanding of the effect of pressure on solidification cracking susceptibility and can be a relevant starting point for studying solidification cracking under high pressures.

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“…And these solidification parameters are the key factors in changing SDAS and CET during the solidification process. [ 7,17–22 ]…”

Section: Resultsmentioning

confidence: 99%

Effect of Pressure on Second Dendrite Arm Spacing and Columnar to Equiaxed Transition of 30Cr15Mo1N Ingot

et al. 2021

steel research int.

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In order to clarify the effects of pressure on the second dendrite arm spacing (SDAS) and columnar to equiaxed transition (CET) of 30Cr15Mo1N ingot, changes in solidification parameters, cooling rate and columnar dendrite tip growth rate with pressure have been investigated. A formula is proposed to obtain the quantitative correlation between pressure (≤ 2 MPa) and interfacial heat transfer coefficient: hi=(28.01P2+299.28P+1129.10)t−0.24. And then, A formula is proposed to calculate SDAS with cooling rate: λ2=21.48×R−0.77, which is applicable for low pressure (≤2 MPa) and low cooling rate (0.4–1.4 K · s−1). There are tiny changes in solidification mode and equilibrium partition coefficient with increasing pressure from 0.5 to 2 MPa. Therefore, increasing pressure refines SDAS mainly by enlarging cooling rate. Pressurization can increase columnar dendrite tip growth rate by enhancing undercooling, and inhibit nucleation and growth of equiaxed dendrite by decreasing constitutional undercooling. It results that the distance between the center of ingot and CET position decreased with increasing pressure from 0.5 to 2 MPa. And a formula is proposed to calculate columnar dendrite tip growth rate with undercooling: V=1.33×10‐5ΔT2+2.71×10‐7ΔT3, which is suitable for low pressure (≤2 MPa).

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Assessment of Temperature and Pressure Dependence of Molar Volume and Phase Diagrams of Binary Al–Si Systems

Cited by 14 publications

References 59 publications

The Crystallography of Aluminum and Its Alloys

The Crystallography of Aluminum and Its Alloys

Effect of pressure on solidification cracking susceptibility of Al–Si alloys

Effect of Pressure on Second Dendrite Arm Spacing and Columnar to Equiaxed Transition of 30Cr15Mo1N Ingot

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