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在A356合金凝固过程中,对锭坯进行超声振动处理。采用不同工艺将锭坯重新加热至半固态,然后采用模铸机进行触变铸造。结果表明,经重新加热和触变铸造后,超声处理的锭坯具有均匀分布的细小球状α(Al)。与未进行超声处理的锭坯相比,经超声处理的触变铸造锭坯具有更高的拉伸强度和伸长率。经超声处理的触变铸造锭坯在拉力作用下表现出韧性断裂倾向,而未经处理的锭坯则呈现出明显的小刻面,表现为脆性断裂。超声熔体处理作为一种触变铸造的处理方法具有可行性和竞争力。
In the A356 alloy solidification process, the billet ultrasonic vibration treatment. Adopt different technology to reheat the billet to the semi-solid state, and then use the die-casting machine for thixoforming. The results show that, after reheating and thixotrope casting, the sonicated billets have uniformly distributed fine spherical α (Al). The sinterable cast thixotropy billet has higher tensile strength and elongation than the billet without sonicating. The thixo-cast billets that were sonicated showed a tendency of ductile fracture under tension, whereas the untreated billets showed obvious facets with brittle fracture. Ultrasonic melt processing as a thixotropic casting method is feasible and competitive.