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Ultrasonic linear and nonlinear properties of fatigued aluminium 6061-T6 with voids
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 Title & Authors
Ultrasonic linear and nonlinear properties of fatigued aluminium 6061-T6 with voids
Kang, To; Song, Sung-Jin; Na, Jeong K.; Park, Jin-Ho;
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It is known that in aluminum 6061-T6, which is composed of and , void nucleation grows around of Al606-T6. In this work, growth of voids was checked by scanning a 6061-T6 specimen with SEM observation. The effects of dislocation damping, coherency strain and voids on ultrasonic attenuation and nonlinearity parameters were experimentally measured. It was observed that a nonlinearity parameter increases until 75 percent of fatigue life and decreases after that. From the results, the authors inferred that dislocation damping and coherency damping increase nonlinearity parameters and void nucleation decreases them as ultrasonic scattering increases with void. The application of nonlinearity parameters in estimating degradation of materials with complex microstructures through fatigue process, therefore, should be carefully considered.
Al6061-T6;voids;attenuation;nonlinearity parameter;
 Cited by
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