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INTRODUCTION Since the early 1990's, there has been significant research devoted to the melting and

Since the early 1990's, there has been significant research devoted to the melting and
crystallization of Pb precipitates embedded in Al matrices. The Al-Pb system is a
convenient model system for such studies as it displays a simple monotectic phase diagram
with negligible mutual solubility in the solid-solid and solid-liquid domains. These
characteristics allow the study of virtually pure solid and liquid Pb precipitates in an
essentially pure Al matrix.
Solid monocrystalline Pb precipitates adopt a cubo-octahedral shape bounded by eight
{111} and six {100} facets, and display a cube-on-cube orientation relationship with the Al
matrix, despite a large (9:11) mismatch of the lattice constants of Al and Pb. Measurements
on alloys containing Pb particles, a few hundred nanometers in size, embedded in Al
matrices, showed a ratio of interfacial energies of the {100} and {111} facets, 100/ 111 of
1.15, which is significantly larger than 1.02 anisotropy ratio of surface energies displayed fo
these orientations by isolated Pb crystals.
Much of the work on Al-Pb alloys has been aimed at better understanding of
nucleation phenomena associated with freezing and melting of small confined particles.
However, some important details of these processes are difficult to observe. Interesting
opportunities are therefore available to investigate those phenomena by atomistic
computer simulation.
The purpose of the present work is to construct suitable interatomic potentials for the


Source: Adams, James B - Department of Chemical and Materials Engineering, Arizona State University


Collections: Materials Science