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

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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 ... continued below

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31 p.

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DIGIOVANNI,ANTHONY A.; CHAN,HELEN M.; HARMER,MARTIN P. & NIED,HERMAN F. May 15, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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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.

Physical Description

31 p.

Notes

OSTI as DE00755600

Medium: P; Size: 31 pages

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  • Journal Name: Journal of the American Ceramic Scoiety; Other Information: Submitted to Journal of the American Ceramic Society

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  • Report No.: SAND2000-1211J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 755600
  • Archival Resource Key: ark:/67531/metadc710162

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  • May 15, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 1:11 p.m.

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DIGIOVANNI,ANTHONY A.; CHAN,HELEN M.; HARMER,MARTIN P. & NIED,HERMAN F. Micromechanics of deformation in porous liquid phase sintered alumina under hertzian contact, article, May 15, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc710162/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.