Plastic strain accommodation and acoustic emission during melting of embedded particles

TL;DR

This study investigates how embedded indium particles in aluminum accommodate melting-induced strain through acoustic emission, revealing dislocation generation mechanisms and quantifying dislocation density increases with indium content.

Contribution

It provides new insights into the strain accommodation process during melting of embedded particles using acoustic emission analysis and quantifies dislocation density changes.

Findings

Acoustic emission energy increases with indium content.

Dislocation generation accommodates melting volume strain.

Dislocation density increases by 4.1 x 10^13 m^-2 at 17 wt% indium.

Abstract

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.