Microstructure and solidification behavior of Al-18%Si hypereutectic alloy prepared by controlled diffusion solidification

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	Microstructure and solidification behavior of Al-18%Si hypereutectic alloy prepared by controlled diffusion solidification
	Zhou, Hong-Wei 2; Li, Yuan-Dong 1,2; Ma, Ying 1,2; Zhang, Xin-Long 2; Liu, Xing-Hai 2
刊名	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
	2014-07-01
卷号	24 期号:7 页码:1761-1770
关键词	Aluminum alloys Diffusion in solids Microstructure Phase interfaces Process control Solidification Temperature Controlled diffusion solidification Equilibrium temperatures Primary silicon Si alloys Solute diffusion
ISSN号	10040609
英文摘要	Using the controlled diffusion solidification (CDS) technology, the predetermined hypereutectic Al-18%Si alloy was prepared. The solidification microstructure evolutions of Al-18%Si alloy with the changing temperatures of low-temperature precursor alloy and solidification behavior were investigated. The results show that, the anisotropy growth of primary Si phase is inhibited by the CDS during solidification process, which can effectively improve the solidification microstructure of Al-18%Si alloy. Adopting an appropriate precursor alloys mixing condition, which is Al-25%Si alloy at 800 and pure Al at 580, the distribution of primary Si phase is uniformly and the average size of Si phase is 42.85 μm in the solidification microstructure. When the temperature of pure Al is too low, serious segregation of primary Si phase exists in the solidification microstructure, and when the temperature of pure Al is too high, the average size of primary Si phase is large. The analysis results show that, during the little constitutional supercooling forming on the interface of solid-liquid in controlled diffusion solidification process, the primary Si phase tends to planar interface growth. The relationship between diffused distance square of solute and equilibrium temperature is logarithmic, the higher the equilibrium temperature, the more sufficient the solute diffusion, and the less the segregation.
语种	中文
出版者	Central South University of Technology
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112720]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.Key Laboratory of Nonferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou ; 730050, China 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou ; 730050, China;
推荐引用方式 GB/T 7714	Zhou, Hong-Wei,Li, Yuan-Dong,Ma, Ying,et al. Microstructure and solidification behavior of Al-18%Si hypereutectic alloy prepared by controlled diffusion solidification[J]. Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,2014,24(7):1761-1770.
APA	Zhou, Hong-Wei,Li, Yuan-Dong,Ma, Ying,Zhang, Xin-Long,&Liu, Xing-Hai.(2014).Microstructure and solidification behavior of Al-18%Si hypereutectic alloy prepared by controlled diffusion solidification.Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,24(7),1761-1770.
MLA	Zhou, Hong-Wei,et al."Microstructure and solidification behavior of Al-18%Si hypereutectic alloy prepared by controlled diffusion solidification".Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals 24.7(2014):1761-1770.