| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Precipitate Contribution to the Acoustic Nonlinearity in Nickel-Based Superalloy |
| Chung-Seok KIM, Cliff J. LISSENDEN |
| Engineering Science and Mechanics, The Pennsylvania State University, 212 EES Bldg. University Park, PA 16802 USA |
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| Cite this article: |
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Chung-Seok KIM, Cliff J. LISSENDEN 2009 Chin. Phys. Lett. 26 086107 |
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Abstract The influence of γ' precipitate on the acoustic nonlinearity is investigated for a nickel-based superalloy, which is subjected to creep deformation. During creep deformation, the cuboidal γ' precipitate is preferentially coarsened in a direction perpendicular to the applied stress axis. The length and shape factor of the γ' precipitate increase with creep time. The increase of relative acoustic nonlinearity with increasing fraction of creep life is discussed in relation to the rafting of γ' precipitate, which is closely related to the scattering and distortion of the acoustic wave.
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| Keywords:
61.72.-y
43.25.+y
07.64.+z
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Received: 11 May 2009
Published: 30 July 2009
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| PACS: |
61.72.-y
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(Defects and impurities in crystals; microstructure)
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43.25.+y
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(Nonlinear acoustics)
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07.64.+z
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(Acoustic instruments and equipment)
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