Transformation toughening: Final technical report

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The main objectives of the program were to develop a fundamental theory of transformation toughening which would include these previously ignored factors: (1) the contribution of the shear components of the transformation strain; (2) the precise details of the location of stress induced martensitic nucleation in the stress field around a propagating crack tip; and (3) non-isotropic and non-linear elastic effects. The method of attack on this problem was to analyze the toughening characteristics of a specific transforming system at the level of atomic resolution with its full non-linear complexity through the use of both molecular dynamics and Monte-Carlo computer ... continued below

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Medium: P; Size: 3 p.

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Creator: Unknown. December 31, 1996.

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Description

The main objectives of the program were to develop a fundamental theory of transformation toughening which would include these previously ignored factors: (1) the contribution of the shear components of the transformation strain; (2) the precise details of the location of stress induced martensitic nucleation in the stress field around a propagating crack tip; and (3) non-isotropic and non-linear elastic effects. The method of attack on this problem was to analyze the toughening characteristics of a specific transforming system at the level of atomic resolution with its full non-linear complexity through the use of both molecular dynamics and Monte-Carlo computer simulation methods. The authors concentrated on the intermetallic compound, NiAl, which is known to undergo a martensitic transformation. A working hypothesis of a more correct nucleation criterion for stress induced martensite was formulated and is being applied to the case of ZrO{sub 2} where fairly good transformation toughening data exists to provide a check of the new ideas. Assuming that this test is successful, this new nucleation model will become the central feature of a general purpose theory that can be used to guide materials developers in other applications where transformation toughening might be used to advantage.

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Medium: P; Size: 3 p.

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OSTI as DE98001754

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  • Other Information: PBD: [1996]

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  • Other: DE98001754
  • Report No.: DOE/ER/45318--T2
  • Grant Number: FG02-87ER45318
  • DOI: 10.2172/573268 | External Link
  • Office of Scientific & Technical Information Report Number: 573268
  • Archival Resource Key: ark:/67531/metadc690977

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 31, 1996

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 6, 2015, 8:23 p.m.

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Transformation toughening: Final technical report, report, December 31, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc690977/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.