文献类型：期刊文献

英文题名：The Formation and Characterization of the Primary Mg2Si Dendritic Phase in Hypereutectic Al-Mg2Si Alloys

作者：Qin, Qingdong Li, Wei

第一作者：秦庆东

通信作者：Qin, Qingdong|[14440b8f0a27c8b88f113]秦庆东;

机构：[1] Department of Materials and Metallurgy Engineering, Guizhou Institute of Technology, No. 1 Caiguan Road, Guiyang, 550003, China; [2] 2011 Special Functional Materials Collaborative Innovation Center of Guizhou Province, No. 1 Caiguan Road, Guiyang, 550003, China; [3] Department of Materials Engineering, Zhengzhou Technology College, No. 81 Zhengshang Road, Zhengzhou, 450041, China

第一机构：贵州理工学院材料与冶金工程学院

通信机构：|贵州理工学院材料与冶金工程学院

年份：2016

卷号：57

期号：2

起止页码：85-90

外文期刊名：Materials Transactions

收录：EI(收录号：20160801991991);Scopus(收录号：2-s2.0-84958568172)

语种：英文

外文关键词：Melt spinning - Aluminum alloys - Magnesium alloys - Hypereutectic alloys - Silicon alloys

摘要：The formation of a primary Mg2Si dendritic phase in hypereutectic Al-Mg2Si alloys is investigated using melt-spinning techniques. The results indicate that, at the initial stage, the primary Mg2Si crystal rapidly grows in a non-faceted manner, forming a smooth dendritic or fluted structure. As the undercooling of the process is varied, the growth behavior transitions from non-faceted to faceted. Subsequently, Mg2Si crystals grow preferentially along the [100] direction producing growth hillocks and forming stable branches. The morphology of the primary Mg2Si crystal exhibits angular facets. Furthermore, if V[100]=V[111] √3 p , the crystal grows as a perfect octahedral dendrite (the dendrite is composed of octahedrons), and if V[100]=V[111]=√3 the crystal grows as a perfect octahedral dendrite (the dendrite is composed of octahedrons), and if [100]=V[111]=√3, the crystal grows with imperfect octahedral subunits. Lastly, the growth process of the primary Mg2Si dendrites is discussed. ? 2016 The Japan Institute of Metals and Materials.