<i>In situ</i>high-resolution electron microscopy observation of the melting process of In particles embedded in an Al matrix

Sasaki, Katsuhiro; Saka, Hiroyasu

doi:10.1080/01418619108205578

Cited by 67 publications

(22 citation statements)

References 7 publications

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“…Meanwhile, the corresponding ÁT la m and the kinetic superheating limit based on homogeneous melt nucleation ÁT K m [6] are also given in table 1. Both of these are higher than ÁT in m , indicating that melting prefers to initiate at the particle-matrix interface, in accordance with computer simulations [16] and experimental observations [27].…”

Section: Calculation Of the Results And Discussionsupporting

confidence: 71%

The kinetic limit of superheating induced by semicoherent interfaces

Mei¹,

Jin²,

Lu³

2005

Philosophical Magazine Letters

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The superheating behaviour of embedded particles induced by semicoherent interfaces has been observed in many circumstances. In this paper, a phenomenological model for melt nucleation on misfit dislocations at a semicoherent interface is proposed. A kinetic limit for semicoherent-interface-induced superheating, which is in good agreement with the results of experiments and computer simulations, is derived from this model. Calculations and analyses based on the model reveal that melting prefers to initiate at the semicoherent interface and that superheating of embedded particles is possible for a melt nucleation contact angle less than 90. Among the matrix-dependent parameters, the contact angle and the shear modulus of the matrix are found to be dominant in determining the superheating of embedded particles.

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Section: Calculation Of the Results And Discussionsupporting

confidence: 71%

The kinetic limit of superheating induced by semicoherent interfaces

Mei¹,

Jin²,

Lu³

2005

Philosophical Magazine Letters

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“…That this diffuse contrast region should be associated with a molten phase, agrees with other experimental data showing small particle melting initiated on (100) surfaces [15]. Molecular dynamics simulations on small gold particles have obtained similar conclusions [t6], and have shown that the densely packed (111) planes may retain their order even quite close to the melting temperature [17].…”

Section: Discussionsupporting

confidence: 76%

Revisiting the structural instability observed in small particles in the electron microscope

Ugarte

1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract. We present experimental results of the structural instability of gold clusters in the electron microscope. Observations of surface melting in a dynamic HREM study of small gold particles (2-5 nm) are provided. We argue that the temperature regime of the particle during observation, remains quite high at about 50-t00 K below the particle's melting temperature. At this temperature, a further 15-30eV would be enough to raise the particle's temperature above the melting point. We conclude that the structural instabilities observed are due to a mechanism based on a recrystallization from a highly excited state.

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“…Saka et al explained this behaviour empirically in terms of the interface energies between the solid and liquid precipitates and the surrounding aluminium matrix. The importance of the interface was further emphasized when it was shown that melting of the indium inclusions is nucleated at cavities situated in the boundary between the matrix and the inclusion or at one of the {OOI} facets (Sasaki and Saka 1991).…”

Section: Introductionmentioning

confidence: 99%