Modification of eutectic silicon and β-Al_5FeSi phases in as-cast ADC12 alloys by using samarium addition  

作　　者：饶远生 闫洪 胡志 

机构地区：[1]Institute of Advanced Forming,Nanchang University [2]Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials,Jiangxi Academy of Sciences

出　　处：《Journal of Rare Earths》2013年第9期916-922,共7页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China(51165032,51364035);Department of Education of JiangxiProvince(GJJ13203);Innovative Group of Science and Technology of College of Jiangxi Province(00008713);Jiangxi Province Education Commission Foundation(GJJ13203);University-industry Cooperation Plan of Non-party Experts and Doctor of Nanchang (2012-CYH-DW-XCL-002) for financial support

摘　　要：The effects of Sm additions （0, 0.5 wt.%, 1.0 wt.%and 1.5 wt.%） on the eutectic Si and β-Al5FeSi phases of ADC12 as-cast alloys were studied by optical microscopy （OM）, scanning electron microscopy （SEM） and differential thermal analysis （DTA）. The experimental results showed that Sm was an effective modifying agent for the eutectic Si of ADC12 alloy, when 1.0 wt.%-1.5 wt.%Sm was added to the alloy, the coarse acicular eutectic Si was modified into fine particle or short rod structure. Moreover, the appropriate addition of Sm （about 1.0 wt.%） had marked effects on shortening the length of needle-likeβ-Al5FeSi phase. Whereas, Sm was less effective on modifying the needle-likeβ-iron to the Chinese script or sphericalα-iron phase. The modification mecha-nism was also discussed.The effects of Sm additions （0, 0.5 wt.%, 1.0 wt.%and 1.5 wt.%） on the eutectic Si and β-Al5FeSi phases of ADC12 as-cast alloys were studied by optical microscopy （OM）, scanning electron microscopy （SEM） and differential thermal analysis （DTA）. The experimental results showed that Sm was an effective modifying agent for the eutectic Si of ADC12 alloy, when 1.0 wt.%-1.5 wt.%Sm was added to the alloy, the coarse acicular eutectic Si was modified into fine particle or short rod structure. Moreover, the appropriate addition of Sm （about 1.0 wt.%） had marked effects on shortening the length of needle-likeβ-Al5FeSi phase. Whereas, Sm was less effective on modifying the needle-likeβ-iron to the Chinese script or sphericalα-iron phase. The modification mecha-nism was also discussed.

关 键 词：ADC12 alloy Sm MODIFICATION eutectic Si β-Al5FeSi rare earths 

分 类 号：TG136.1[一般工业技术—材料科学与工程]