Formation of Microstructure in Al-Si Alloys Under Ultrasonic Melt Treatment
Formation of Microstructure in Al-Si Alloys Under Ultrasonic Melt Treatment
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超声波熔融处理铝硅合金显微组织的形成
DOI：
10.1002/9781118359259.ch174
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
L. Katgerman
中科院分区：
文献类型：
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作者：
L. Zhang;D. Eskin;A. Miroux;L. Katgerman
众所周知，超声熔体处理（UST）为铸造工艺提供了许多好处，特别是对于铸态组织的细化或改性。尽管有许多关于亚共晶A356型和过共晶（18-24重量% Si）合金的报告，显示出初级Al或Si细化，但缺乏对Al-Si合金的系统研究。本文系统地分析了超声处理对亚共晶、近共晶和过共晶铝硅合金（包括工业活塞合金）显微组织形成的影响。结果表明，在一定的温度范围内，超声处理可细化晶粒和初晶Si颗粒，而在整个凝固过程中超声处理可粗化共晶Si相或初晶Si颗粒。
It is well known that ultrasonic melt treatment (UST) provides many benefits to casting processing, especially for the refinement or modification of as-cast structure. There is a lack for systematic studies on Al-Si alloys, although a number of reports are available on hypo-eutectic A356-type and hyper-eutectic (18–24 wt% Si) alloys, showing primary Al or Si refinement. In this paper, the effect of UST on the formation of microstructure was systematically analyzed in hypo-eutectic, near-eutectic and hyper-eutectic Al-Si alloys, including commercial piston alloys. The results show that UST usually results in the refinement of grains and primary Si particles when it is applied in a proper temperature range, while ultrasonic treatment during the whole solidification processing leads to coarsening effect on eutectic Si phase or primary Si particles.