Microstructure analysis of ZA alloy rod directionally solidified by heated mold continuous casting

	Microstructure analysis of ZA alloy rod directionally solidified by heated mold continuous casting
	Ma, Ying; Hao, Yuan; Yan, Feng-Yun; Liu, Hong-Jun
	2004
会议日期	March 14, 2004 - March 18, 2004
会议地点	Charlotte, NC, United states
关键词	Aluminum alloys Continuous casting Heat treatment Microstructure Molds Phase transitions Solidification Surface chemistry Columnar steel Heated mold Lanzhou University of Technology Zinc-aluminium alloy
页码	261-268
英文摘要	The as-cast and heat treatment microstructure of ZA alloy rod directionally solidified by continuous casting has been analyzed. The results show that the microstructure of the ZA alloy line is the parallel directional dendritic columnar crystal. Each dendritic crystal of eutectic alloy ZA5 is composed of many layer eutectic β and η phases. The microstructure of hyper eutectic ZA alloys is primary dendritic crystal and interdendritic eutectic structure. The primary phase of ZA8 and ZA12 is β phase, while the primary phase of ZA22 and ZA27 is α phase. The technique of heated mold continuous casting, that is OCC, was invented by Ohno A[1-3]. The main difference between this method and traditional continuous casting is that it have changed the cooling mold of traditional continuous casting into the heated mold, to avoid the surface solidification of molten metal on the inner mold. During the solidification of heated mold continuous technique, heat of molten metal transfers alone the one dimension of solidified solid phase to form the directional solidified condition. The solidified structure of casting is determined by the heat and quantity transfer and the composition of alloy together. Having entered into the stable growth stage of crystal, only the crystal with a parallel direction to heat flow can growth well. Therefore, the rod made by heated mold continuous casting is the directional continuous columnar structure. Alloy composition determines the solidification structure and the forming tendency of phase structure. The alloy with a different composition has a different solidification character. The microstructure of alloys with a columnar structure but different composition has an obvious difference. Hence, authors have observed and analyzed the structure of heated mold continuous casting ZA alloy rod in order to find an effect method to increase the properties of ZA alloy.
会议录	TMS Annual Meeting
会议录出版者	Minerals, Metals and Materials Society
语种	英语
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/117129]
专题	材料科学与工程学院国际教育学院
作者单位	State Key Laboratory of Advanced Non-Ferrous Materials, Lanzhou University of Technology, Lanzhou 730050, China
推荐引用方式 GB/T 7714	Ma, Ying,Hao, Yuan,Yan, Feng-Yun,et al. Microstructure analysis of ZA alloy rod directionally solidified by heated mold continuous casting[C]. 见:. Charlotte, NC, United states. March 14, 2004 - March 18, 2004.