Effect of Volume Fraction on the Flow Behavior of Al-SiC Composites Considering the Spatial Distribution of Delaminated Particles

Abstract

The effect of the volume fraction of second-phase particles on the distribution of damaged particles and its relation to the tensile deformation behavior were investigated in the particle reinforced metal-matrix composites, Al-SiC. The spatial distributions of all SiC particles and the delaminated SiC particles were evaluated from their two-dimensional local number (LN2D). During tensile deformation, larger SiC particles in more highly clustered regions were more easily delaminated at the particle/matrix interface. The amount of particle delamination in the more highly clustered region increased with increasing volume fraction and strain during tensile deformation. A model was developed to explain the flow behavior of the composites; this showed a good fit to the experimental results in the presence of particle damage, especially when the spatial distribution of damaged particles was taken into consideration.

Prediction of Flow Behavior in the Heterogeneously Dispersed Al-10 vol%SiC Composites

“…It was shown in our previous study that many particles were failed by a particle/matrix delamination 23) in deformation process. Figures 2 and 3 show that the average of LN2D of delaminated particles, LN2D d;av , and the NF of delaminated particles, f nd , increase with increasing plastic strain.…”

“…Figures 2 and 3 show that the average of LN2D of delaminated particles, LN2D d;av , and the NF of delaminated particles, f nd , increase with increasing plastic strain. Both of them could be well approximated by the empirical equations proposed in the previous study 23) by fitting the experimental results,…”

“…It was determined in our previous study 23) that the relationship between k and V p was approximated by the following linear function.…”

“…[17][18][19][20] Here, a 2-dimensional local number, LN2D, is introduced to quantitatively evaluate the clustering tendency of the composite, detailed in our previous paper. 21,22) In our previous paper, 23) a simple model was developed to explain the flow behavior of the homogeneous composites having different volume fraction, especially considering the spatial distribution of the damaged particles and gave a good fit to the experimental results. Here, based on our previous research, we have systematically evaluated the flow and strain-hardening behavior of the heterogeneously dispersed Al-10 vol%SiC composites.…”

Effect of the Interfacial Thermal Resistance on the Effective Thermal Conductivity of Aluminum Matrix Composites

“…Nowadays, high-thermal-conductivity heat-sink for the power semiconductor is demanded. Silicon-carbide particle is one of candidates as a reinforcing material because it exhibits high elastic modulus and hardness, high melting point and good thermal stability [1][2][3] . The interfacial thermal resistance between the matrix and the reinforcement is thought to have a considerable effect on the effective thermal conductivity of composites.…”