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Grain-Size Distribution Effects on the Attenuation of Laser-Generated Ultrasound in α-Titanium Alloy

Bai, Xue ; Zhao, Yang ; Ma, Jian ; Liu, Yunxi ; Wang, Qiwu

Materials, 2018-12, Vol.12 (1), p.102 [Periódico revisado por pares]

Switzerland: MDPI

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  • Título:
    Grain-Size Distribution Effects on the Attenuation of Laser-Generated Ultrasound in α-Titanium Alloy
  • Autor: Bai, Xue ; Zhao, Yang ; Ma, Jian ; Liu, Yunxi ; Wang, Qiwu
  • Assuntos: grain-size distribution ; laser ultrasonics ; ultrasonic attenuation ; α-titanium alloy
  • É parte de: Materials, 2018-12, Vol.12 (1), p.102
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Average grain size is usually used to describe a polycrystalline medium; however, many investigations demonstrate the grain-size distribution has a measurable effect on most of mechanical properties. This paper addresses the experimental quantification for the effects of grain-size distribution on attenuation in α-titanium alloy by laser ultrasonics. Microstructures with different mean grain sizes of 26⁻49 μm are obtained via annealing at 800 °C for different holding times, having an approximately log-normal distribution of grain sizes. Experimental measurements were examined by using two different theoretical models: (i) the classical Rokhlin's model considering a single mean grain size, and (ii) the improved Turner's model incorporating a log-normal distribution of grain sizes in the attenuation evaluation. Quantitative agreement between the experiment and the latter model was found in the Rayleigh and the Rayleigh-to-stochastic transition regions. A larger attenuation level was exhibited than the classical theoretical prediction considering a single mean grain size, and the frequency dependence of attenuation reduced from a classical fourth power to an approximately second power due to a greater probability of large grains than the assumed Poisson statistics. The provided results would help support the use of laser ultrasound technology for the non-destructive evaluation of grain size distribution in polycrystalline materials.
  • Editor: Switzerland: MDPI
  • Idioma: Inglês
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