Ultrasonic Attenuation Caused by Scattering in Polycrystalline Metals

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<jats:p>Ultrasonic-attenuation measurements have been made on fine-grained specimens of several metals. The grain-size distributions and ultrasonic velocities in these metals were also determined. The experimental attenuation is in good quantitative as well as qualitative agreement with current theory. Nickel and three iron alloys, one 30% nickel reported previously, the second 12% chromium (type 416 stainless steel), and the third 17% chromium and 1% carbon (type 440-C stainless steel), all gave good results. Brass also gave good results, but copper showed much twinning, which as yet is unaccounted for.</jats:p>

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