Pola Annalisa, Montesano Lorenzo, Tocci Marialaura, La Vecchia Giovina Marina
DIMI-Mechanical and Industrial Engineering Department, Via Branze, 38-25123 Brescia, Italy.
Materials (Basel). 2017 Mar 3;10(3):256. doi: 10.3390/ma10030256.
Ultrasound treatment of liquid aluminum alloys is known to improve mechanical properties of castings. Aluminum foundry alloys are frequently used for production of parts that undergo severe cavitation erosion phenomena during service. In this paper, the effect of the ultrasound treatment on cavitation erosion resistance of AlSi7 alloy was assessed and compared to that of conventionally cast samples. Cavitation erosion tests were performed according to ASTM G32 standard on as-cast and heat treated castings. The response of the alloy in each condition was investigated by measuring the mass loss as a function of cavitation time and by analyzing the damaged surfaces by means of optical and scanning electron microscope. It was pointed out that the ultrasound treatment increases the cavitation erosion resistance of the alloy, as a consequence of the higher chemical and microstructural homogeneity, the finer grains and primary particles and the refined structure of the eutectic induced by the treatment itself.
众所周知，对液态铝合金进行超声处理可改善铸件的机械性能。铝铸造合金常用于生产在使用过程中会遭受严重空蚀现象的零件。本文评估了超声处理对AlSi7合金抗空蚀性能的影响，并与传统铸造样品进行了比较。根据ASTM G32标准，对铸态和热处理后的铸件进行了空蚀试验。通过测量质量损失随空蚀时间的变化以及借助光学显微镜和扫描电子显微镜分析受损表面，研究了合金在每种条件下的响应。结果表明，由于超声处理本身导致合金具有更高的化学和微观结构均匀性、更细的晶粒和初生颗粒以及细化的共晶组织，超声处理提高了合金的抗空蚀性能。
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