skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Micromechanics of deformation in porous liquid phase sintered alumina under hertzian contact

Abstract

A series of fine-grained porous alumina samples, with and without a liquid phase, were fabricated in compositions matched closely to commercially available alumina used as a microelectronic substrates. Hertzian indentation on monolithic specimens of the glass-containing samples produced a greater quasi-ductile stress-strain response compared to that observed in the pure alumina. Maximum residual indentation depths, determined from surface profilometry, correlated with the stress-strain results. Moreover, microstructural observations from bonded interface specimens revealed significantly more damage in the form of microcracking and under extreme loading, pore collapse, in the glass-containing specimens. The absence of the typical twin faulting mechanism observed for larger-grained alumina suggests that the damage mechanism for quasi-ductility in these fine-grained porous alumina derived from the pores acting as a stress concentrator and the grain boundary glass phase providing a weak path for short crack propagation.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
755600
Report Number(s):
SAND2000-1211J
Contract NSF-961668; TRN: AH200021%%46
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Scoiety
Additional Journal Information:
Other Information: Submitted to Journal of the American Ceramic Society; PBD: 15 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; ALUMINIUM OXIDES; SUBSTRATES; MICROELECTRONIC CIRCUITS; CRACK PROPAGATION; DEFORMATION; MICROSTRUCTURE; PORE STRUCTURE; RESIDUAL STRESSES; FRACTURE MECHANICS

Citation Formats

DIGIOVANNI,ANTHONY A., CHAN,HELEN M., HARMER,MARTIN P., and NIED,HERMAN F. Micromechanics of deformation in porous liquid phase sintered alumina under hertzian contact. United States: N. p., 2000. Web.
DIGIOVANNI,ANTHONY A., CHAN,HELEN M., HARMER,MARTIN P., & NIED,HERMAN F. Micromechanics of deformation in porous liquid phase sintered alumina under hertzian contact. United States.
DIGIOVANNI,ANTHONY A., CHAN,HELEN M., HARMER,MARTIN P., and NIED,HERMAN F. Mon . "Micromechanics of deformation in porous liquid phase sintered alumina under hertzian contact". United States. https://www.osti.gov/servlets/purl/755600.
@article{osti_755600,
title = {Micromechanics of deformation in porous liquid phase sintered alumina under hertzian contact},
author = {DIGIOVANNI,ANTHONY A. and CHAN,HELEN M. and HARMER,MARTIN P. and NIED,HERMAN F.},
abstractNote = {A series of fine-grained porous alumina samples, with and without a liquid phase, were fabricated in compositions matched closely to commercially available alumina used as a microelectronic substrates. Hertzian indentation on monolithic specimens of the glass-containing samples produced a greater quasi-ductile stress-strain response compared to that observed in the pure alumina. Maximum residual indentation depths, determined from surface profilometry, correlated with the stress-strain results. Moreover, microstructural observations from bonded interface specimens revealed significantly more damage in the form of microcracking and under extreme loading, pore collapse, in the glass-containing specimens. The absence of the typical twin faulting mechanism observed for larger-grained alumina suggests that the damage mechanism for quasi-ductility in these fine-grained porous alumina derived from the pores acting as a stress concentrator and the grain boundary glass phase providing a weak path for short crack propagation.},
doi = {},
journal = {Journal of the American Ceramic Scoiety},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}