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Noncontact evaluation of the dependency of electrical conductivity on stress for various Al alloys as a function of plastic deformation and annealing

Lookup NU author(s): Dr Maxim Morozov, Professor Gui Yun TianORCiD


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This paper presents a method of noncontact evaluation of the anisotropic dependency of electrical conductivity of metallic specimens exposed to tensile stress. The method combines eddy current (EC) measurements using a directional probe with numerical modeling to infer the electrical conductivity longitudinal and transverse to an essentially static uniaxial applied tensile stress. The inversion method has been applied to various aluminum alloys (AA1050, AA2024, AA5083, and AA7075). The recovered changes in electrical conductivity lie within the theoretically expected range of a few percent at the yield stress. The effect of prior plastic strain and heat treatment on electrical conductivity has also been evaluated. The electrical conductivity tensor for hardenable alloys exhibit a distinct dependence on cold work compared to the nonhardenable ones. The outcomes are discussed in terms of their implications for the use of EC measurements for diagnosing the state of residual stress for aluminum alloys. (C) 2010 American Institute of Physics. [doi:10.1063/1.3456996]

Publication metadata

Author(s): Morozov M, Tian GY, Withers PJ

Publication type: Article

Publication status: Published

Journal: Journal of Applied Physics

Year: 2010

Volume: 108

Issue: 2

Print publication date: 30/07/2010

ISSN (print): 0021-8979

ISSN (electronic): 1520-8850

Publisher: American Institute of Physics


DOI: 10.1063/1.3456996

Notes: Article no. 024909 9 pages


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Funder referenceFunder name
EP/E025498Engineering and Physical Sciences Research Council
EP/E005071Engineering and Physical Sciences Research Council