Deformation and Fracture Mechanics of Superior Nanocomposites

Abstract:

Lightweight ultra-fine grained (<1 μm size) SiC-ZrO₂(3Y₂O₃) composites, with a combination of high hardness, high bending strength and high fracture toughness, were successfully prepared by high energy mechanical milling followed by heat treatment. The SiC-ZrO₂(3Y₂O₃) composites exhibitied high hardness (1707 MPa), high bending strengh (as high as 1689 MPa) and high fracture toughness (up to approximately 12.6 MPa.m^1/2). Such a combination of mechanical properties was attributed to the fine microstructure with a distinct feature consisting of almost continuous network of ZrO₂(3Y₂O₃) phase around SiC grains, or we call harmonic microstructure. It has been demonstrated that a combination of these unique microstructural characteristics was very effective in supressing the initiation of cracks and governing the path of their subsequent growth during fracture, leading to excellent combination of mechanical properties.

• Periodical: Materials Science Forum (Volume 990)
• Pages: 244-249
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.990.244
• Online since: May 2020
• Authors: Lydia Anggraini*
• Keywords: Ceramics Nanocomposite, Heat Treatment, High Energy Milling, Mechanical Characterization, Phase Transformation

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