Mechanism of ductile rupture in the Al/sapphire system elucidated using x-ray tomographic microscopy

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The fracture of a thin metal foil constrained between alumina or sapphire blocks has been studied by a number of investigators. The systems that have been investigated include Al, Au, Nb, and Cu. Except for Al/Al{sub 2}O{sub 3} interfaces, these systems exhibit a common fracture mechanism: pores form at the metal/ceramic interface several foil thicknesses ahead of the crack which, under increasing load, grow and link with the initial crack. This mechanism leaves metal o none side of the fracture surface and clean ceramic on the other. This has not been the observation in Al/Al{sub 2}O{sub 3} bonds where at ... continued below

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8 p.

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King, W.E.; Campbell, G.H.; Haupt, D.L.; Kinney, J.H.; Riddle, R.A. & Wien, W.L. December 18, 1995.

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Description

The fracture of a thin metal foil constrained between alumina or sapphire blocks has been studied by a number of investigators. The systems that have been investigated include Al, Au, Nb, and Cu. Except for Al/Al{sub 2}O{sub 3} interfaces, these systems exhibit a common fracture mechanism: pores form at the metal/ceramic interface several foil thicknesses ahead of the crack which, under increasing load, grow and link with the initial crack. This mechanism leaves metal o none side of the fracture surface and clean ceramic on the other. This has not been the observation in Al/Al{sub 2}O{sub 3} bonds where at appropriate thicknesses of Al, the fracture appears to proceed as a ductile rupture through the metal. This paper addresses the question of why the fracture of the Al/Al{sub 2}O{sub 3} system appears to be different from other systems by probing the fracture mechanism using X-ray tomographic microscopy (XTM). The authors have experimentally duplicated the simplified geometry of the micromechanics models and subjected the specimens to a well defined stress state in bending. The bend tests were interrupted and XTM was performed to reveal the mechanism of crack extension.

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8 p.

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OSTI as DE96009990

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995

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  • Other: DE96009990
  • Report No.: UCRL-JC--121400
  • Report No.: CONF-951155--120
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/231570 | External Link
  • Office of Scientific & Technical Information Report Number: 231570
  • Archival Resource Key: ark:/67531/metadc669695

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  • December 18, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 17, 2016, 2:21 p.m.

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King, W.E.; Campbell, G.H.; Haupt, D.L.; Kinney, J.H.; Riddle, R.A. & Wien, W.L. Mechanism of ductile rupture in the Al/sapphire system elucidated using x-ray tomographic microscopy, report, December 18, 1995; California. (digital.library.unt.edu/ark:/67531/metadc669695/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.