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利用两套自制的功率超声双振动头试验装置,对A356铝合金流动熔体进行处理获得半固态浆料,对比分析了1.0kW和1.5kW超声换能器交错式排布流道及对向式排布流道装置处理A356合金的凝固组织,研究了合金熔体在运动状态中加上功率超声场影响下的凝固机理,分析了功率超声的机械效应、热效应及声流效应对半固态金属结晶的影响。结果表明,浆料经处理后的试样金相组织的细化、球化效果与振动头的摆放位置有关,交错式比对向式处理效果好;流道上的凝料因激冷和整个凝固过程都在流道上受到振动影响而更细小,流出流道的晶粒易长大,受到超声和斜流道影响而球化更好。
Two sets of self-powered ultrasonic dual vibrating head test devices were used to process the semi-solid slurry of the A356 aluminum alloy melt, and compared the staggered arrangement of the 1.0kW and 1.5kW ultrasonic transducers and the counter- The solidification microstructure of A356 alloy was treated with the arrangement of flow channel device. The solidification mechanism of the alloy melt under dynamic ultrasonic field was studied. The mechanical, thermal and acoustic effects of power ultrasound were analyzed. Impact. The results show that the refinement and the spheroidization effect of microstructure of the treated sample are related to the placement of the vibrating head. The staggered pattern is better than the opposite pattern; Solidification process in the flow channel by the vibration and more small, out of the flow of the grain easy to grow, by the impact of ultrasound and oblique flow and better ball.