熔体温度与Sr变质对Al-20Si合金中Si相的影响  

Effect of Melt Thermal Treatment and Strontium Modification on Morphology of Silicon Phases in Al-20Si Alloy

作　　者：李秋菊[1] 魏喆良[1] 王连登[1] 陈永禄[2] 洪丽华[2] 高军[3] 吴颍[1] 

机构地区：[1]福州大学机械工程及自动化学院 [2]福建工程学院材料科学与工程系 [3]福州大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2012年第9期859-862,共4页Special Casting & Nonferrous Alloys

基　　金：福建省科技厅重点项目(2010H0002);国家大学生创新性实验计划项目(101038606);福州大学科技发展基金资助项目(2010-XY-11);福建省教育厅A类科研项目(JA09173)

摘　　要：研究了熔体温度处理工艺(包括熔体混合及熔体过热处理)与Sr变质对Al-20Si合金中Si相形态的影响。结果表明,在试验条件下,单纯Sr变质对Al-20Si中的初晶Si细化作用较弱,对共晶Si变质效果不明显。经Sr变质的Al-10Si低温熔体与高温Al-30Si熔体按1:1混合后,Al-20Si熔体中的形核核心数量增加,初晶Si明显细化;在熔体混合的基础上,对熔体进行过热处理,当熔体温度过热至1000℃时,初晶Si平均尺寸可细化至14μm,共晶Si也由未变质前的长针状变为短纤维状。The compound influence of melt thermal treatment,including melt mixing and melt superheating,and strontium modification on silicon phases in Al-20Si alloy was investigated.The results show that with only strontium modification,the primary silicon in the alloy is modified weakly,and the morphology change of the eutectic silicon can be ignored.The low temperature Sr modified Al-10Si melt mixed with the high temperature Al-30Si melt in the ratio of 1：1,nuclei number in Al-20Si melt is increased,resulting in the significant refinement of primary Si phase.And then,mixed melt is treated by superheating to 1 000 ℃,and the average size of the primary silicon is decreased to approximately 14 μm,and the morphology of the eutectic silicon is changed from long needle-shape into short fiber-like.

关 键 词：过共晶AL-SI合金 变质 熔体温度处理 熔体混合 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.1[金属学及工艺—金属材料]