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Title: On the Effect of Local Grain-Boundary Chemistry on the Macroscopic Mechanical Properties of a High Purity Y2O3-Al2O3-Containing Silicon Nitride Ceramic: Role of Oxygen

Abstract

The effects of grain-boundary chemistry on the mechanical properties were investigated on high-purity silicon nitride ceramics, specifically involving the role of oxygen. Varying the grain-boundary oxygen content, by control of oxidizing heat treatments and sintering additives, was found to result in a transition in fracture mechanism from transgranular to intergranular fracture, with an associated increase in fracture toughness. This phenomenon is correlated to an oxygen-induced change in grain-boundary chemistry that appears to affect fracture by ''weakening'' the interface, facilitating debonding and crack advance along the boundaries, and consequently toughening by grain bridging. It is concluded that if the oxygen content in the thin grain-boundary films exceeds a lower limit, which is {approx}0.87 equiv% oxygen content, then the interfacial structure and bonding characteristics favor intergranular debonding during crack propagation; otherwise, transgranular fracture ensues.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15014652
Report Number(s):
UCRL-CONF-208303
Journal ID: ISSN 1946-4274; TRN: US200802%%1407
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 839; Conference: Presented at: 2004 MRS Fall Meeting, Boston, MA, United States, Nov 29 - Dec 03, 2004
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADDITIVES; BONDING; CERAMICS; CHEMISTRY; CRACK PROPAGATION; FRACTURE PROPERTIES; FRACTURES; HEAT TREATMENTS; MECHANICAL PROPERTIES; OXYGEN; SILICON NITRIDES; SINTERING

Citation Formats

Ziegler, A, McNaney, J M, Hoffman, M J, and Ritchie, R O. On the Effect of Local Grain-Boundary Chemistry on the Macroscopic Mechanical Properties of a High Purity Y2O3-Al2O3-Containing Silicon Nitride Ceramic: Role of Oxygen. United States: N. p., 2004. Web. doi:10.1557/PROC-839-P3.14.
Ziegler, A, McNaney, J M, Hoffman, M J, & Ritchie, R O. On the Effect of Local Grain-Boundary Chemistry on the Macroscopic Mechanical Properties of a High Purity Y2O3-Al2O3-Containing Silicon Nitride Ceramic: Role of Oxygen. United States. https://doi.org/10.1557/PROC-839-P3.14
Ziegler, A, McNaney, J M, Hoffman, M J, and Ritchie, R O. Tue . "On the Effect of Local Grain-Boundary Chemistry on the Macroscopic Mechanical Properties of a High Purity Y2O3-Al2O3-Containing Silicon Nitride Ceramic: Role of Oxygen". United States. https://doi.org/10.1557/PROC-839-P3.14. https://www.osti.gov/servlets/purl/15014652.
@article{osti_15014652,
title = {On the Effect of Local Grain-Boundary Chemistry on the Macroscopic Mechanical Properties of a High Purity Y2O3-Al2O3-Containing Silicon Nitride Ceramic: Role of Oxygen},
author = {Ziegler, A and McNaney, J M and Hoffman, M J and Ritchie, R O},
abstractNote = {The effects of grain-boundary chemistry on the mechanical properties were investigated on high-purity silicon nitride ceramics, specifically involving the role of oxygen. Varying the grain-boundary oxygen content, by control of oxidizing heat treatments and sintering additives, was found to result in a transition in fracture mechanism from transgranular to intergranular fracture, with an associated increase in fracture toughness. This phenomenon is correlated to an oxygen-induced change in grain-boundary chemistry that appears to affect fracture by ''weakening'' the interface, facilitating debonding and crack advance along the boundaries, and consequently toughening by grain bridging. It is concluded that if the oxygen content in the thin grain-boundary films exceeds a lower limit, which is {approx}0.87 equiv% oxygen content, then the interfacial structure and bonding characteristics favor intergranular debonding during crack propagation; otherwise, transgranular fracture ensues.},
doi = {10.1557/PROC-839-P3.14},
url = {https://www.osti.gov/biblio/15014652}, journal = {},
issn = {1946-4274},
number = ,
volume = 839,
place = {United States},
year = {2004},
month = {11}
}

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Works referenced in this record:

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