脉冲磁场对A356铝合金凝固组织及硬度的影响  

Add to Favorite Get Latest Update Effects of Pulsed Magnetic Field on Solidification Microstructure and Hardness of A356 Aluminum Alloy

作　　者：宋志起 王军[1] 胡朝晟 赵旭东 刘永珍[1] 麻永林[1] Song Zhiqi;Wang Jun;Hu Chaosheng;Zhao Xudong;Liu Yongzhen;Ma Yonglin(Materials and Metallurgy College,Inner Mongolia University of Science and Technology)

机构地区：[1]内蒙古科技大学材料与冶金学院

出　　处：《特种铸造及有色合金》2023年第7期917-922,共6页Special Casting & Nonferrous Alloys

基　　金：内蒙古自治区科技计划资助项目(2021GG0096)。

摘　　要：采用蔡司显微镜(OM)、场发射扫描电镜(FESEM)和维氏硬度计研究了不同电流强度下的脉冲磁场对A356铝合金凝固组织和硬度的影响。结果表明,脉冲磁场可以显著细化A356铝合金凝固组织中初生α-Al相和共晶Si相并提高其硬度,其中电流为100 A时脉冲磁场细化效果最佳。与未处理相比,脉冲处理试样中初生α-Al晶粒平均尺寸下降了30.97%,共晶Si平均尺寸下降了68.6%,硬度提高了19.6%。分析了脉冲磁场作用下形核过程,结果表明,脉冲磁场能降低形核激活能,使熔体中原子团的数目增加、尺寸减小,提高形核率。The effects of pulsed magnetic field on the solidification microstructure and hardness of A356 aluminum alloy under different current intensities were investigated by Zeiss microscope(OM),field emission scanning electron microscope(FESEM)and Vickers hardness tester.The results indicate that the primaryα-Al phase and eutectic silicon phase in the solidification structure of A356 aluminum alloy can be refined and the hardness can be improved by pulse magnetic field,where the pulse magnetic field with current intensity of 100 A exhibits the desirable refining effect.Compared with untreated ones,the average size of primaryα-Al grains and eutectic silicon is decreased by 30.97%and 68.6%,respectively,and the hardness is increased by 19.6%.The nucleation process under the action of pulsed magnetic field was analyzed.The results reveal that pulsed magnetic field can reduce the activation energy of nucleation,leading to the increase of atomic clusters and nucleation rate as well as reduction of size in the melt.

关 键 词：A356铝合金 脉冲磁场 凝固组织 初生α-Al相 

分 类 号：TG146.21[一般工业技术—材料科学与工程]