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, QD[1];Qin, QD[2]|[14440c17cf7bd1f4ff05e]秦庆东;[144400fa133c5f6c59dc2]秦庆东;

机构：[1]Guizhou Inst Technol, Dept Mat & Met Engn, 1 Caiguan Rd, Guiyang 550003, Peoples R China;[2]2011 Special Funct Mat Collaborat Innovat Ctr Gui, 1 Caiguan Rd, Guiyang 550003, Peoples R China;[3]Zhengzhou Technol Coll, Dept Mat Engn, 81 Zhengshang Rd, Zhengzhou 450041, Peoples R China

第一机构：贵州理工学院材料与冶金工程学院

通信机构：corresponding author), Guizhou Inst Technol, Dept Mat & Met Engn, 1 Caiguan Rd, Guiyang 550003, Peoples R China;corresponding author), 2011 Special Funct Mat Collaborat Innovat Ctr Gui, 1 Caiguan Rd, Guiyang 550003, Peoples R China.|贵州理工学院材料与冶金工程学院;贵州理工学院;

年份：2016

卷号：57

期号：2

起止页码：85-90

外文期刊名：MATERIALS TRANSACTIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000372671200001)】；

基金：This work is supported by The National Natural Science Foundation of China (51564005, 51465009), The National Natural Science Foundation of Guizhou Province (Qian Ke He J[2015]2058), The High Qualified People Starting Foundation of GIT (XJGC20140603) and The Scientific & Technological Innovation Talent Team of Guizhou Province (Qian Ke He Talent Team [2015]4008).

语种：英文

外文关键词：crystal morphology; formation; hypereutectic Al-Mg2Si alloys; Mg2Si dendrite

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] = root 3 the crystal grows as a perfect octahedral dendrite (the dendrite is composed of octahedrons), and if V-[100]/V-[111] < root 3 the crystal grows with imperfect octahedral subunits. Lastly, the growth process of the primary Mg2Si dendrites is discussed.