A New Approach to Ultrasonic Degassing to Improve the Mechanical Properties of Aluminum Alloys
A New Approach to Ultrasonic Degassing to Improve the Mechanical Properties of Aluminum Alloys
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DOI：
10.1007/s11665-014-1133-2
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发表时间：
2014-07
影响因子：
2.3
通讯作者：
H. Puga;J. Barbosa;J. C. Teixeira;M. Prokić
中科院分区：
文献类型：
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作者：
H. Puga;J. Barbosa;J. C. Teixeira;M. Prokić
过去几年，人们对液态金属的超声波脱气进行了研究，但仅限于少量熔体的实验室规模实验。在这项工作中，使用专门设计的低频机械振动器与超声波脱气装置耦合，研究了声空化与超声波辐射器本身的机械振动引起的金属搅拌的综合效应。通过高速数字 Photron—FastCam APX RS 摄像机和激光多普勒风速计来表征水中的液体运动，以选择最有利的超声和机械振动器频率来引起适当的水搅拌。使用选定的参数对 10 L 的 AlSi9Cu3(Fe) 合金进行脱气。使用合适的压电传感器来测量距超声波发生器不同距离处的声压，以识别声学活动较高的区域。结果表明，熔体搅拌显着提高了 US 脱气效率（因为在 3 分钟处理时间后几乎可以达到铝合金的理论密度），这有助于提高合金的拉伸性能。
Ultrasonic degassing of liquid metals has been studied over the last years, but it has been limited to laboratorial scale experiments of low volumes of melt. In this work, the combined effect of acoustic cavitation with metal agitation induced by the mechanical vibration of the ultrasonic radiator itself was studied, using a specially designed low frequency mechanical vibrator coupled to the ultrasonic degassing unit. Liquid motion in water was characterized by high speed digital Photron—FastCam APX RS video camera and Laser Doppler Anemometry to select the most favorable US and mechanical vibrator frequencies to induce suitable water stirring. Selected parameters were used to degas 10 L of AlSi9Cu3(Fe) alloy. A suitable piezoelectric sensor was used to measure sound pressure at different distances from the sonotrode to identify the zone of higher acoustic activity. Results have shown that melt stirring significantly improves US degassing efficiency (since it is possible to achieve almost the aluminum alloy theoretical density after 3 min processing time) which contributed to increase the tensile properties of the alloy.