  Melting point phenomena of micron-sized indium particles embedded in an
aluminum matrix were studied by means of acoustic emission. The acoustic energy
measured during melting increased with indium content. Acoustic emission during
the melting transformation suggests a dislocation generation mechanism to
accommodate the 2.5% volume strain required for melting of the embedded
particles. A geometrically necessary increase in dislocation density of 4.1 x
10^13 m^-2 was calculated for the 17 wt% indium composition.
