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用频率为2.5和10兆赫的回波一脉冲法测定超声波在铝合金铸锭中的衰减系数。虽然合金的相成份不同,但在衰减系数和晶粒度之间存在一定的关系,这样就提出了以晶粒作为散射条件的超声波衰减的理论计算。在生产上不采用超声波检验铸锭是因为对铸造的材料中超声振动的衰减问题研究得尚不充分的缘故,为此,本文便专门研究了工业铝合金铸锭中超声波的衰减。
The attenuation coefficient of ultrasonic wave in aluminum alloy ingot was measured by echo-pulse method with frequencies of 2.5 and 10 MHz. Although the alloy phase composition is different, but there is a certain relationship between the attenuation coefficient and the grain size, thus put forward to the grain as the scattering of ultrasonic attenuation theory calculation. Ultrasonic testing of ingots in production is not sufficient because of the inadequacies in the attenuation of ultrasonic vibrations in the cast material. To this end, this paper studies the attenuation of ultrasonic waves in industrial aluminum ingots.