刘车凯,李志勇,裴小龙,杨柳青,薛铜辉,仁杰亮.AZ91D镁合金表面堆焊Al-Si合金涂层微观组织及分析[J].表面技术,2018,47(4):172-176.
LIU Che-kai,LI Zhi-yong,PEI Xiao-long,YANG Liu-qing,XUE Tong-hui,REN Jie-liang.Microstructure and Analysis of Surfacing Al-Si Coating on AZ91D Magnesium Alloy[J].Surface Technology,2018,47(4):172-176
AZ91D镁合金表面堆焊Al-Si合金涂层微观组织及分析
Microstructure and Analysis of Surfacing Al-Si Coating on AZ91D Magnesium Alloy
投稿时间:2017-11-23  修订日期:2018-04-20
DOI:10.16490/j.cnki.issn.1001-3660.2018.04.025
中文关键词:  AZ91D镁合金  ER4043焊丝  DC-PMIG堆焊  金属间化合物  微观组织
英文关键词:AZ91D magnesium alloy  ER4043 welding wire  DC-PMIG surfacing  intermetallic compound  microstructure
基金项目:山西省重点研发计划工业项目(201603D121002-1);山西省自然科学基金(2012011021-1);山西省回国留学人员科研基金资助项目(2013-07)
作者单位
刘车凯 中北大学 焊接研究中心,太原 030051 
李志勇 中北大学 焊接研究中心,太原 030051 
裴小龙 中北大学 焊接研究中心,太原 030051 
杨柳青 中北大学 焊接研究中心,太原 030051 
薛铜辉 中北大学 焊接研究中心,太原 030051 
仁杰亮 中北大学 焊接研究中心,太原 030051 
AuthorInstitution
LIU Che-kai Welding Research Center, North University of China, Taiyuan 030051, China 
LI Zhi-yong Welding Research Center, North University of China, Taiyuan 030051, China 
PEI Xiao-long Welding Research Center, North University of China, Taiyuan 030051, China 
YANG Liu-qing Welding Research Center, North University of China, Taiyuan 030051, China 
XUE Tong-hui Welding Research Center, North University of China, Taiyuan 030051, China 
REN Jie-liang Welding Research Center, North University of China, Taiyuan 030051, China 
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中文摘要:
      目的 在镁合金上堆焊Al-Si合金涂层,分析Mg/Al界面处过渡区的组织、成分与形成过程。方法 采用低成本、高效的直流脉冲熔化极气体保护焊(DC-PMIG welding),在低热输入下将ER4043(AlSi5)焊丝堆焊到AZ91D镁合金表面,形成Al-Si合金涂层。采用金相显微镜、扫描电镜、能谱仪、X射线衍射仪分析Mg/Al过渡区的微观组织,讨论过渡区的组织、成分,并分析其形成过程与机理。结果 过渡区分为两部分。区域I的主要成分依次为Mg+Al12Mg17、Al12Mg17、Al12Mg17+Al3Mg2和Al3Mg2,不规则块状Mg2Si相弥散分布于其中。区域II的主要成分为柱状α-Al,表面析出了大量点状Al3Mg2,α-Al柱状晶晶界处存在黑色点状Mg2Si。结论 直流脉冲熔化极气体保护焊能够在AZ91D镁合金表面制备Al-Si合金涂层,基体与涂层之间存在过渡区,过渡区中不同位置的镁、铝相对含量不同,成分也不相同。区域I与区域II中Mg2Si不同的析出顺序,使其微观结构不同:Mg2Si在镁含量相对较多的区域I中优先析出并长大,形成块状Mg2Si;而区域II中率先析出α-Al,随后在α-Al晶界处形成了黑色点状Mg2Si。
英文摘要:
      The work aims to overlayAl-Si alloy coating on magnesium alloy, and analyze microstructure, composition and formation process of the transition zone on Al/Mg interface. A low-cost high-efficiency production process-direct current (DC) pulse metal inert gas (PMIG) shielded welding was used to deposit Al-Si alloy coating on AZ91D magnesium alloy using ER4043 wires (AlSi5). Microstructure, morphology and composition of the Mg/Al transition zone were measured with metallurgical microscope, scanning electron microscope, energy-dispersive spectrometer (EDS) and X-ray diffractometer(XRD). Formation process and composition of the transition zone were analyzedas well. The transition zone consisted of two regions. Region I was made up of Mg+Al12Mg17, Al12Mg17, Al12Mg17+Al3Mg2 and Al3Mg2, respectively. Irregular massive Mg2Si phase was dispersed in region I. The region II was mainly made up of columnar α-Al, with plenty of precipitated dotted Al3Mg2, and there was black dotted Mg2Si on grain boundary of columnar α-Al. Direct current pulse metal inert gas shielded welding can be used to prepare Al-Si coating on AZ91D magnesium alloy. There is a transition zone between substrate and coating. Relative Mg and Al content and composition are differentin positions of the transition zone.The precipitation of Mg2Si in region I and region II was different, which explained the different morphology. Mg2Si preferentially precipitated and grew tomassive Mg2Si in region I with relatively high magnesium content, while α-Al precipitated first in region II, and subsequently forms black dotted Mg2Si on grain boundary of α-Al.
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