<i>The Solid–Liquid Interface</i>

Woodruff, David P.; Bikerman, J. J.

doi:10.1063/1.3128498

Cited by 109 publications

(59 citation statements)

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“…The greatest effect of excess sulfur in Ni40AI was to increase the number of interfacial voids. The void density after only 30 min at 1000°C was as high as 0.l/l-tm 2 , while the average number density on the regular purity Ni40Al (from 5-100 hr oxidation at 1000°C) was only 0.0l/l-tm 2 • Since the energy barrier for heterogeneous nucleation of a void is proportional to (2 + cos 8)(1-cos 8)4 r:., /f1G~ [35], where f1Gy is the volume free energy change of void nucleation, Ym the surface energy of the metal and ethe angle between the pore edge and the oxide scale. Segregation of S to the initial void embryo would reduce Ym, and eas well if the interface and oxide surface energies remain the same.…”

Section: _10mentioning

confidence: 99%

Interfacial Segregation, Pore Formation, and Scale Adhesion on NiAl Alloys

2005

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Ni-40 and 50at%AI alloys were oxidized at 1000°C for various times in oxygen. Auger electron microscopy was used to study the interface chemistry after scale spallation in ultra high vacuum. The interfacial failure stresses were determined using a tensile pull tester and related to the interface chemistry, pore area and density. Results showed that sulfur started to segregate to areas ofthe Ah03INi40AI interface where the scale was in contact with the alloy after a complete layer of a-Ah03 developed there; the concentration then gradually increased to a steady level of~2 at%. However, sulfur did not segregate to similar areas of the Ah03INi50AI interface even after extended oxidation when it was amply present on interfacial void faces. This behavior demonstrated a strong dependence of interface segregation on NiAI alloy composition. Interfacial failure stress was found to decrease with increasing sulfur content between voids and with higher interface porosity. The level of porosity was strongly related to the sulfur content in the alloy. When Ni40AI was doped with excess sulfur, the segregation behavior did not change, but the interfacial pore density increased significantly. The detrimental effect of sulfur on scale adhesion is two-fold: to weaken the interface and to enhance interfacial pore formation.

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Section: _10mentioning

confidence: 99%

Interfacial Segregation, Pore Formation, and Scale Adhesion on NiAl Alloys

2005

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“…Most experimental studies obtain the crystal-liquid interfacial free energy indirectly by applying classical nucleation theory to homogeneous nucleation rate measurements [1,2,4,6,7]. Such nucleation rate measurements represent an average over the various orientations of the crystal and therefore provide no information regarding the anisotropy of the crystal.…”

Section: Introductionmentioning

confidence: 99%

“…The interfacial free energy between a crystal phase in coexistence with its liquid phase, γ cl , is an important thermodynamic quantity which controls the rate of homogeneous nucleation and the morphology of a crystal growing from its melt [1][2][3][4][5]. The magnitude and anisotropy in γ cl determines whether crystal growth occurs in a planar, cellular or dendritic manner.…”

Section: Introductionmentioning

confidence: 99%

Crystal-liquid interfacial free energy via thermodynamic integration

Horbach

2014

The Journal of Chemical Physics

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A novel thermodynamic integration (TI) scheme is presented to compute the crystal-liquid interfacial free energy (γ cl ) from molecular dynamics simulation. The scheme is applied to a Lennard-Jones system. By using extremely short-ranged and impenetrable Gaussian flat walls to confine the liquid and crystal phases, we overcome hysteresis problems of previous TI schemes that stem from the translational movement of the crystal-liquid interface. Our technique is applied to compute γ cl for the (100), (110) and (111) orientation of the crystalline phase at three temperatures under coexistence conditions. For one case, namely the (100) interface at the temperature T = 1.0 (in reduced units), we demonstrate that finite-size scaling in the framework of capillary wave theory can be used to estimate γ cl in the thermodynamic limit. Thereby, we show that our TI scheme is not associated with the suppression of capillary wave fluctuations.

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“…Let θ 1 and θ 2 be the disorientation angles of two adjacent grains G1 and G2, respectively (Figure 15). The surface tension γ GB of a GB such that the value of the angle θ 12 = θ 1 − θ 2 (which is one of the angular components characterizing the misorientation of the GB) is larger than a few degrees, is equal to 2γ N S [36]. The apex angle between the two solid-liquid interfaces on the bottom of a GB groove is zero (Young's law).…”

Section: Nonfaceted and Faceted Gb Grooves At Rest (V = 0)mentioning

confidence: 99%

Surface effects in nucleation and growth of smectic-Bcrystals in thin samples

Börzsönyi

Akamatsu²

2002

Phys. Rev. E

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We present an experimental study of the surface effects (interactions with the container walls) during the nucleation and growth of smectic B crystals from the nematic in free growth and directional solidification of a mesogenic molecule (C4H9 − (C6H10)2CN) called CCH4 in thin (of thickness in the 10 µm range) samples. We follow the dynamics of the system in real time with a polarizing microscope. The inner surfaces of the glass-plate samples are coated with polymeric films, either rubbed polyimid (PI) films or monooriented poly(tetrafluoroethylene) (PTFE) films deposited by friction at high temperature. The orientation of the nematic and the smectic B is planar. In PI-coated samples, the orientation effect of SmB crystals is mediated by the nematic, whereas, in PTFE-coated samples, it results from a homoepitaxy phenomenon occurring for two degenerate orientations. A recrystallization phenomenon partly destroys the initial distribution of crystal orientations. In directional solidification of polycrystals in PTFE-coated samples, a particular dynamics of faceted grain boundary grooves is at the origin of a dynamical mechanism of grain selection. Surface effects also are responsible for the nucleation of misoriented terraces on facets and the generation of lattice defects in the solid.

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The Solid–Liquid Interface

Cited by 109 publications

References 0 publications

Interfacial Segregation, Pore Formation, and Scale Adhesion on NiAl Alloys

Interfacial Segregation, Pore Formation, and Scale Adhesion on NiAl Alloys

Crystal-liquid interfacial free energy via thermodynamic integration

Surface effects in nucleation and growth of smectic-Bcrystals in thin samples

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