Effect of CaC_2 particulates concentration on microstructure and tensile properties of elemental magnesium  

作　　者：马玉涛 张兴国 郝海 

机构地区：[1]School of Materials Science and Engineering,Dalian University of Technology [2]State Key Laboratory of Materials Modification by Laser,Ion and Electron Beams

出　　处：《中国有色金属学会会刊：英文版》2008年第A01期283-287,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50475157)supported by the National Natural Science Foundation of China;Project(105052)supported by the Key Project ofMinistry of Education of China

摘　　要：CaC_2 particulates reinforced magnesium materials were synthesized using a new technique-electromagnetic suspension casting(ESC).The microstructure and composition of magnesium alloys were investigated and the mechanical properties of alloys were tested.The tensile fracture surfaces were also studied by scanning electron microscopy.And the grain refinement effect of alloys was also examined.The results indicate that proper additions of CaC_2 particulates are found to be efficient in refining the microstructure of magnesium materials.The tensile properties of alloys are consistent with the grain sizes.0.26%(mass fraction) of CaC_2 addition reduces the mean grain size of pure magnesium from more than 2 mm to 125μm,and the ultimate tensile strength of pure magnesium at room temperature decreases from 77 to 148 MPa.CaC2 particulates reinforced magnesium materials were synthesized using a new technique- electromagnetic suspension casting（ESC）. The microstructure and composition of magnesium alloys were investigated and the mechanical properties of alloys were tested. The tensile fracture surfaces were also studied by scanning electron microscopy. And the grain refinement effect of alloys was also examined. The results indicate that proper additions of CaC2 particulates are found to be efficient in refining the microstructure of magnesium materials. The tensile properties of alloys are consistent with the grain sizes. 0.26% （mass fraction） of CaC2 addition reduces the mean grain size of pure magnesium from more than 2 mm to 125 um, and the ultimate tensile strength of pure magnesium at room temperature decreases from 77 to 148 MPa.

关 键 词：镁合金 变形 电磁-悬浮 铸造 

分 类 号：TG146.22[一般工业技术—材料科学与工程]