文献类型：期刊文献

英文题名：Effects of Sr plus Ce on Microstructure and Abrasive Resistance of In-Situ Mg2Si/Al-Si-Cu Composites

作者：Qin, Qingdong Li, Wei

第一作者：秦庆东

通信作者：Qin, QD[1];Qin, QD[2]|[14440b8f0a27c8b88f113]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 450051, 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：5

起止页码：618-623

外文期刊名：MATERIALS TRANSACTIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000378103400008)】；

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：Metal matrix composite; casting; modification; abrasive resistance

摘要：In the present study, the modification effect of Sr+Ce in Mg2Si/Al-Si-Cu composites was investigated for controlling both the microstructure and mechanical properties. Furthermore, the hardness and the abrasive resistance after modification were also studied. The results show that when the composites were modified by 0.40 mass% Ce, the morphology of the primary Mg2Si phase changes to a polygonal morphology with a size of 15 mu m. However, in those with a 0.40 mass% Ce and 0.05 mass% Sr addition, the morphology changes to an irregular and equiaxed shape, and the size increases to 50 mu m. Furthermore, in the 0.40 mass% Ce and 0.10 mass% Sr addition, the primary Mg2Si morphology transforms to a rectangular trapezoid, or "T" shape, with sizes measuring 70 mu m. Additionally, in the 1.00 mass% Ce and 0.05 mass% Sr, and the 1.00 mass% Ce and 0.10 mass% Sr addition, the primary Mg2Si morphologies become either polygonal or irregular shaped, respectively. The eutectic phases change shows that, with the addition of Ce or Sr, the eutectic phases exist in the form of the binary eutectic of Al+Mg2Si or the ternary eutectic of Al+Mg2Si+Si. The hardness test illustrates that the hardness of the 1.00 mass% Ce and 0.05 mass% Sr and the 0.40 mass% Ce and 0.05 mass% Sr, modified composites are higher than the unmodified composites. The abrasive resistance data shows that modified composites with the 1.00 mass% Ce and 0.05 mass% Sr are higher than that of the modified and unmodified composites with a 0.40 mass% Ce and 0.05 mass% Sr. The abrasive resistance agrees with the hardness test results, and this demonstrates that the Sr+Ce addition can change the microstructure and enhance the mechanical properties of the material.