Morphology of Pores and Interfaces and Mechanical Behavior of Nanocluster-Assembled Silicon Nitride Ceramic

Journal Article · Tue Dec 31 23:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.689· OSTI ID:439106

Kalia, R K; Nakano, A; Tsuruta, K; Vashishta, P ^[1]

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1. Concurrent Computing Laboratory for Materials Simulations, Department of Physics and Astronomy and Department of Computer Science, Louisiana State University, Baton Rouge, Louisiana 70803 (United States)

Million atom molecular-dynamics simulations are performed to investigate the structure, dynamics, and mechanical behavior of cluster-assembled Si{sub 3}N{sub 4}. These solids contain highly disordered interfacial regions with 50% undercoordinated atoms. Systems sintered at low pressures have percolating pores whose surface morphologies are well characterized by two values of the roughness exponent, 0.46 and 0.86; these are close to the experimental values found by Bouchaud {bold {ital etal.}}for fracture surfaces. Results for elastic moduli are consistent with a three-phase model for heterogeneous materials. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: FG05-92ER45477
• OSTI ID: 439106
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
ELASTICITY
INTERFACES
MECHANICAL PROPERTIES
MOLECULAR DYNAMICS METHOD
PORE STRUCTURE
SILICON NITRIDES
SOLID CLUSTERS
STRUCTURAL MODELS