Development of microstructures with improved cryogenic toughness through local variations in stress state: Aluminum-lithium alloys

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Microstructurally-induced changes in the local stress state (triaxial constraint) and their effect on fracture-toughness behavior are examined at ambient and cryogenic temperatures in an Al-Li-Cu-Zr alloy, processed in the form of 12.7 mm-thick naturally laminated'' plate containing aligned-weak interfaces and 1.6 mm-thin unlaminated sheet. It is shown that marked improvements in long-transverse (L-T) toughness can be achieved in the plate material at cryogenic temperatures by promoting through-thickness delamination along these interfaces, which relaxes local constraint and promotes a fracture-mode transition from global plane strain to local plane stress. Conversely, in thin sheet material, the absence of such interface delamination leads ... continued below

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Pages: (14 p)

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Venkateswara Rao, K.T. & Ritchie, R.O. (Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering) April 1, 1990.

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Description

Microstructurally-induced changes in the local stress state (triaxial constraint) and their effect on fracture-toughness behavior are examined at ambient and cryogenic temperatures in an Al-Li-Cu-Zr alloy, processed in the form of 12.7 mm-thick naturally laminated'' plate containing aligned-weak interfaces and 1.6 mm-thin unlaminated sheet. It is shown that marked improvements in long-transverse (L-T) toughness can be achieved in the plate material at cryogenic temperatures by promoting through-thickness delamination along these interfaces, which relaxes local constraint and promotes a fracture-mode transition from global plane strain to local plane stress. Conversely, in thin sheet material, the absence of such interface delamination leads to a reduction in toughness with decrease in temperature, consistent with the greater degree of crack-tip constraint. 17 refs., 4 figs., 1 tab.

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Pages: (14 p)

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OSTI; NTIS; GPO Dep.

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  • Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 16-21 Apr 1990

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  • Other: DE92000900
  • Report No.: LBL-28964
  • Report No.: CONF-900466--102
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 5295904
  • Archival Resource Key: ark:/67531/metadc1069722

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Office of Scientific & Technical Information Technical Reports

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  • April 1, 1990

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  • Feb. 4, 2018, 10:51 a.m.

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  • April 25, 2018, 5:58 p.m.

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Venkateswara Rao, K.T. & Ritchie, R.O. (Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering). Development of microstructures with improved cryogenic toughness through local variations in stress state: Aluminum-lithium alloys, article, April 1, 1990; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1069722/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.