Solid-liquid surface energies in the AlCuAl2, AlNiAl3 and AlTi systems

Maraşlı, Necmetti̇n; Hunt, J. D.

doi:10.1016/1359-6454(95)00227-8

Cited by 163 publications

(134 citation statements)

References 21 publications

Supporting

Mentioning

134

Contrasting

Order By: Relevance

“…They are listed in Table II. [55][56][57][58][59] It is noted that the variation of the solidliquid interface energy, r SL , resulted from solutes addition, is in the order of 10 À2 J m À2 . The unit of J mol À1 for DG used in the present work in Figures 2, 3 and 5 can be converted to J m À3 through dividing the DG values by molar volume of solid solution, which is within the range of 8:8 $ 11:6 Â 10 À6 m 3 mol À1 .…”

Section: Resultsmentioning

confidence: 99%

The Influence of the Effect of Solute on the Thermodynamic Driving Force on Grain Refinement of Al Alloys

Wang

Liu

Qiu

et al. 2014

Metall Mater Trans A

View full text Add to dashboard Cite

Grain refinement is known to be strongly affected by the solute in cast alloys. Addition of some solute can reduce grain size considerably while others have a limited effect. This is usually attributed to the constitutional supercooling which is quantified by the growth restriction factor, Q. However, one factor that has not been considered is whether different solutes have differing effects on the thermodynamic driving force for solidification. This paper reveals that addition of solute reduces the driving force for solidification for a given undercooling, and that for a particular Q value, it is reduced more substantially when adding eutectic-forming solutes than peritectic-forming elements. Therefore, compared with the eutectic-forming solutes, addition of peritectic-forming solutes into Al alloys not only possesses a higher initial nucleation rate resulted from the larger thermodynamic driving force for solidification, but also promotes nucleation within the constitutionally supercooled zone during growth. As subsequent nucleation can occur at smaller constitutional supercoolings for peritectic-forming elements, a smaller grain size is thus produced. The very small constitutional supercooling required to trigger subsequent nucleation in alloys containing Ti is considered as a major contributor to its extraordinary grain refining efficiency in cast Al alloys even without the deliberate addition of inoculants.

show abstract

Section: Resultsmentioning

confidence: 99%

The Influence of the Effect of Solute on the Thermodynamic Driving Force on Grain Refinement of Al Alloys

Wang

Liu

Qiu

et al. 2014

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…A similar process of cell formation was observed by De Wilde for eutectic growth of a(Al) and Al 2 Cu lamellae in ternary Al-Cu-Si alloys. This specific break-up process may be due to the significant difference between the solid/liquid surface energy of a(Al) and the Al 2 Cu phase, as measured in binary Al-Cu alloys by Gündüz and Hunt [55] and Maraşli and Hunt [56]. In this sense, À6 to 31 Â 10 À6 m/s.…”

Section: Coupled Growth and Morphological Stability Of Univariant Eutmentioning

confidence: 99%

“…Vahlas et al [54] performed experiments on ternary Al-Sn-In and Zn-Pb-Sn alloys in order to check pair interaction models on the influence of concentration and temperature on both, adsorption and interface structure. Ongoing work on ternary alloys, however, is based on the grain boundary groove technique applied by Gündüz and Hunt [55] and Maraşli and Hunt [56] to binary alloys in eutectic and peritectic equilibrium. The method has been used to determine both, the solid/liquid interfacial free energy from the Gibbs-Thomson coefficient and the interfacial free energy of solid/solid hetero-interfaces from force equilibrium at the triple junction.…”

Section: Interfacial Energiesmentioning

confidence: 99%

Multiphase solidification in multicomponent alloys

Hecht

Gránásy

Pusztai

et al. 2004

Materials Science and Engineering: R: Reports

167

View full text Add to dashboard Cite

“…A l l s i m u l a t i o n s w e r e p e r f o r m e d u n d e r a c o n s t a n t undercooling 1 K using Al-Cu eutectic alloy, whose physical parameters [18][19][20][21] are provided in Table 1. It should be noted that the solute expansion coefficient β c was negative, which indicates that the larger the concentration, the heavier the system [18] .…”

Section: Materials and Initial Conditionmentioning

confidence: 99%

Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt

2017

View full text Add to dashboard Cite

A s one of the most important solidification patterns, eutectic microstructure has been recognized for its significant influence on the ultimate mechanical properties of the materials [1,2] . Since the classical mathematical analysis for the steady-state growth of eutectic alloy was presented by Jackson and Hunt [3] , theoretical studies on eutectic solidification have attracted increasing attention.However, the influence of convection on eutectic growth still lacks sufficient research. Generally, there are two main types of convection considered during the directional solidification of eutectic alloys, i.e., forced convection caused by imposed external fields, and natural convection driven by the solute (or density) difference. Considering that there are many uncertainties in experiments, numerical simulation has become an indispensable way to accurately recover the underlying physics during solidification [4][5][6][7] . Wang et al. [8] performed a Monte-Carlo simulation of eutectic growth with weak convection and found that convection made Abstract: In the present study, the influence of natural convection on the lamellar eutectic growth is determined by a phase-field-lattice Boltzmann study for Al-Cu eutectic alloy. The mass difference resulting from concentration difference led to the fluid flow, and a robust parallel and adaptive mesh refinement algorithm was employed to improve the computational efficiency without any compromising accuracy. Results show that the existence of natural convection would affect the growth undercooling and thus control the interface shape by adjusting the lamellar width. In particular, by alternating the magnitude of the solute expansion coefficient, the strength of the natural convection is changed. Corresponding microstructure patterns are discussed and compared with those under no-convection conditions. the distribution of lamellar spacing more scattered. But beyond that, to the best of our knowledge, there has been no more numerical case to study the effect of convection on eutectic growth. Encouragingly, a robust parallel-adaptive mesh refinement algorithm (Para-AMR) has been developed to efficiently solve the phase field equations including the dendritic [9] and eutectic transitions [10] . The lattice Boltzmann method (LBM) has also emerged with great potential to numerically solve the energy, momentum and mass transport problems by a relaxation to a local equilibrium [11][12][13] . Therefore, it seems reasonable to couple the LBM into eutectic phase-field models to retrieve the interaction of eutectic microstructure and flows.In this work, we coupled the LBM into the developed Para-AMR algorithm to reveal the effect of natural convection on eutectic growth. The phase field model was employed to simulate eutectic evolution while the LBM was for the simultaneous calculation of melt convection. The velocity field near the solid/liquid (S/ L) interface was explored and several key mechanisms were highlighted. In particular, by alternating the magnitude of solute expansion coe...

show abstract

Solid-liquid surface energies in the AlCuAl2, AlNiAl3 and AlTi systems

Cited by 163 publications

References 21 publications

The Influence of the Effect of Solute on the Thermodynamic Driving Force on Grain Refinement of Al Alloys

The Influence of the Effect of Solute on the Thermodynamic Driving Force on Grain Refinement of Al Alloys

Multiphase solidification in multicomponent alloys

Phase-field-lattice Boltzmann study for lamellar eutectic growth in a natural convection melt

Contact Info

Product

Resources

About