Mechanical resonancespectroscopy of interparticle boundaries in high-density iron powder compacts

Abstract

Characteristics of mechanical resonance are measured on powder iron samples with aporosity of 0.06 produced by die compaction and sintering at 573 to 1373 K. Young"smodulus and parameter С_N that describes how the resonant frequency varies with increasing amplitude of oscillation are calculated. It is established that С_N decreases with increasing temperature of sintering. Comparing the resonance characteristics with results from fracture toughness tests and structural analysis shows that С_N correlates with fracture toughness andfailure mode of samples. The results indicate that С_N is related to the evolution of the inter-particle boundaries and may be used as a highly sensitive criterion to quantitatively assessthe quality of sintered powder materials