Evaluation of Fracture Toughness Distribution in Ceramic-Metal Functionally Graded Materials

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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.

Info:

Periodical:

Key Engineering Materials (Volumes 345-346)

Edited by:

S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim

Pages:

497-500

Citation:

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

Online since:

August 2007

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$38.00

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DOI: https://doi.org/10.1007/978-1-4615-5301-4_6

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[5] [10] [15] [20] [25] [30] 0 20 40 60 80 100 100 80 60 40 20 0 Volume fraction of SUS304 (%) Non-FGM (45µm) FGM (45µm) Volume fraction of PSZ (%) Indentation fracture method.

[5] [10] [15] [20] [25] [30] 0 20 40 60 80 100 100 80 60 40 20 0 Volume fraction of SUS304 (%) Non-FGM (45µm) FGM (45µm) Non-FGM (45µm) FGM (45µm) Volume fraction of PSZ (%) Indentation fracture method.

[5] [10] [15] [20] [25] [30] 0 20 40 60 80 100 Volume fraction of PSZ (%) 100 80 60 40 20 0 Volume fraction of SUS304 (%) Non-FGM (10µm) FGM (10µm) Indentation fracture method.

[5] [10] [15] [20] [25] [30] 0 20 40 60 80 100 Volume fraction of PSZ (%) 100 80 60 40 20 0 Volume fraction of SUS304 (%) Non-FGM (10µm) FGM (10µm) Non-FGM (10µm) FGM (10µm) Indentation fracture method Fig. 8 Comparison of fracture toughness between non-FGM and FGM. (a) Coarse microstructure (b) Fine microstructure.

DOI: https://doi.org/10.1155/2016/3298685

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