Thermal and mechanical properties of AlSi7Mg matrix syntactic foams reinforced by Al$_2$O$_3$ or SiC particles in matrix

TL;DR

This paper investigates the thermal and mechanical properties of AlSi7Mg matrix syntactic foams reinforced with Al₂O₃ or SiC particles, using advanced experimental methods and the Guyer--Krumhansl heat equation to account for non-Fourier heat conduction.

Contribution

It introduces a novel evaluation procedure for transient thermal response data of heterogeneous metal foams using the Guyer--Krumhansl model, improving parameter estimation.

Findings

Deviation from Fourier's law observed in experiments

Proposed method for more reliable thermal diffusivity and conductivity estimation

Effective thermal parameters characterized for composite metal foams

Abstract

Materials with complex inner structure can be challenging to characterize in an effective way. First, it is difficult to determine the representative volume for such a heterogeneous material. Second, the effective material parameters significantly depend on the structure, and thus on the interface properties. In the present paper, we focus on composite metal foams, and we attempt to determine the effective thermal parameters. We use the heat pulse experiment to study its transient thermal response. We observed deviation from Fourier's law, and thus we propose an evaluation procedure for such experimental data using the Guyer--Krumhansl heat equation. Furthermore, we studied the effective parameters, the specific heat, mass density, thermal conductivity and thermal diffusivity, and we propose a method for deducing a more reliable thermal diffusivity and thermal conductivity based on the transient temperature history.