Instrumented and Vickers Indentation for the characterization of stiffness, hardness and toughness of zirconia toughened Al<inf>2</inf>O<inf>3</inf> and SiC Armor

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DOIResolve DOI: http://doi.org/10.1016/j.jmst.2015.06.005
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TypeArticle
Journal titleJournal of Materials Science and Technology
ISSN1005-0302
Volume31
Issue8
Pages773783; # of pages: 11
SubjectAlumina; Armor; Ceramic materials; Cracks; Elastic moduli; Fracture; Silicon carbide; Vickers hardness; Zirconia; Fracture toughness values; Indentation fracture toughness; Indentation size effects; Microstructure analysis; Silicon carbides (SiC); Vickers indentation testing; Zirconia toughened alumina; Fracture toughness
AbstractInstrumented and Vickers indentation testing and microstructure analysis were used to investigate zirconia toughened alumina (ZTA) and silicon carbide (SiC). Several equations were studied to relate the Vickers indentation hardness, Young's modulus and crack behavior to the fracture toughness. The fracture in SiC is unstable and occurs primarily by cleavage leading to a relatively low toughness of 3MPam1/2, which may be inappropriate for multi-hit capability. ZTA absorbs energy by plastic deformation, pore collapse, crack deviation and crack bridging and exhibits time dependent creep. With a relatively high toughness around 6.6MPam1/2, ZTA is promising for multi-hit capability. The higher accuracy of median equations in calculating the indentation fracture toughness and the relatively high c/a ratios above 2.5 suggest median type cracking for both SiC and ZTA. The Young's modulus of both ceramics was most accurately measured at lower indentation loads of about 0.5kgf, while more accurate hardness and fracture toughness values were obtained at intermediate and at higher indentation loads beyond 5kgf, respectively. A strong indentation size effect (ISE) was observed in both materials. The load independent hardness of SiC is 2563 HV, putting it far above the standard armor hardness requirement of 1500 HV that is barely met by ZTA.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Aerospace
Peer reviewedYes
NPARC number21277039
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Record identifierf3357ec7-da5d-4af6-a902-89deeb20c9c2
Record created2015-11-10
Record modified2016-05-09
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