脉冲磁场对高含量自生Mg_2Si/Mg-Al基复合材料凝固组织的影响

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英文篇名：Improved Solidification Structure of in-situ Mg_2Si/Mg-Al Composites by Applying Pulsed Magnetic Field: a Comparative Study 作者：刘飞 ; 尹健 ; 邵琦 ; 卢春辉 英文作者：LIU Fei;YIN Jian;SHAO Qi;LU Chunhui;School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University; 关键词：Mg-Al基复合材料 ; 脉冲磁场(PMF) ; 凝固组织 ; Mg_2Si 英文关键词：Mg-Al matrix composites;;pulsed magnetic field(PMF);;solidification structure;;Mg_2Si 中文刊名：CLDB 英文刊名：Materials Reports 机构：南昌航空大学航空制造工程学院; 出版日期：2019-01-25 出版单位：材料导报 年：2019 期：v.33 基金：国家自然科学基金(51661023);; 江西省自然科学基金(20151BAB216002)~~ 语种：中文; 页：CLDB201902018 页数：5 CN：02 ISSN：50-1078/TB 分类号：94-98

摘要

本工作旨在考察脉冲磁场下制备的自生Mg_2Si/Mg-Al基复合材料的凝固组织。设计了Mg-9Al-3Si、Mg-9Al-6Si和Mg-9Al-9Si三种高含量自生Mg_2Si/Mg-Al复合材料,借助光学显微镜观察了常规条件和不同频率的脉冲磁场条件下复合材料凝固组织的宏观及微观形貌。实验发现,脉冲磁场的引入使得三种复合材料凝固组织中缩孔缩松缺陷得到显著改善;初生Mg_2Si相均由粗大树枝状变为小块状或短枝晶状,且分布趋于均匀,但α-Mg基体晶粒未得到明显细化。在0～20 Hz范围内,脉冲磁场的频率越大对Mg-9Al-6Si凝固组织中初生Mg_2Si相的细化效果越好。
        The purpose of this work is to comparatively investigate the solidification structure of in situ Mg_2 Si/Mg-Al composites obtained under pulsed magnetic field( PMF). We designed three material compositions,i. e. Mg-9 Al-3 Si,Mg-9 Al-6 Si and Mg-9 Al-9 Si,and determined macroscopic and microscopic microstructure of the composites solidified under conventional circumstances and with a PMF applied via optical microscopic observation. The results showed that the introduction of PMF during solidification process leads to obvious reduction in porosity and shrinkage cavity. Meanwhile,the primary Mg_2 Si phases transform from coarse dendrites into fine blocks or small dendrites and distribute uniformly,but α-Mg grains are not refined. In the pulse frequency range of 0—20 Hz,PMF with higher frequencies can achieve better grain refinement effect for primary Mg_2 Si phase in the Mg-9 Al-6 Si composite.

引文

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