Evaluation of Fracture Toughness Distribution in Ceramic-Metal Functionally Graded Materials
This paper deals with evaluation of fracture toughness in functionally graded materials (FGMs) consisting of partially stabilized zirconia (PSZ) and austenitic stainless steel SUS 304. FGMs and non-graded composites (non-FGMs) with fine and coarse microstructures are fabricated by powder metallurgy using PSZ and two kinds of SUS 304 powders. The fracture toughness is determined by conventional tests for several non-FGMs with each material composition and by a method utilizing stable crack growth for FGMs. Based on the experimental results, fracture mechanism, influences of microstructure on fracture toughness, and difference in fracture toughness between the FGMs and non-FGMs has been discussed.
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
K. Tohgo et al., "Evaluation of Fracture Toughness Distribution in Ceramic-Metal Functionally Graded Materials ", Key Engineering Materials, Vols. 345-346, pp. 497-500, 2007