Interfacial reaction between AZ91D magnesium alloy melt and mild steel under high temperatureOACSTPCDEI
The metallurgical quality control of magnesium(Mg)and Mg alloys in melting process is required to ensure a satisfied mechanical and corrosion performance,while the typical used steel crucible introduces impurities and interfacial interaction during melting process.Therefore,a systematic study about impurities diffusion and interfacial interaction between molten Mg and steel is necessary.In the present study,the interfacial reaction between molten AZ91D Mg alloy and mild steel during melting process was investigated with the melting temperatures of 700℃,750℃ and 800℃.The results show that Al(Fe,Mn)intermetallic layer is the intermetallic primarily formed at the interfaces of AZ91D melt and mild steel.Meanwhile,Al_(8)(Mn,Fe)5is indexed between Al(Fe,Mn)and AZ91D.AlFe_(3)C appears between the mild steel and Al(Fe,Mn)at 700℃ and 750℃,but absent at 800℃ due to the increased solubility of carbon in Mg matrix.It is found that the growth of the intermetallic layer is controlled by diffusion mechanism,and Al and Mn are the dominant diffusing species in the whole interfacial reaction process.By measuring the thickness of different layers,the growth constant was calculated.It increases from 1.89(±0.03)×10^(-12)m^(2)·s^(-1)at 700℃ to 3.05(±0.05)×10^(-12)m^(2)·s^(-1)at 750℃,and 5.18(±0.05)×10^(-12)m^(2)·s^(-1)at 800℃.Meanwhile,the content of Fe is linearly increased in AZ91D with the increase of holding time at 700℃ and 750℃,while it shows a significantly increment after holding for 8 h at 800℃,indicating holding temperature is more crucial to determine the Fe content of AZ91D than holding time.
Jia-hong Dai;Jian-yue Zhang;Bin Jiang;Xiang-jun Xu;Zhong-tao Jiang;Hong-mei Xie;Qing-shan Yang;Guo-qing Zhang;
College of Materials Science and Engineering,Yangtze Normal University,Chongqing 408100,China National Engineering Research Center for Magnesium Alloys,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China Chongqing Jiulongyuan High-tech Industry Group Co.,Ltd.,Chongqing 400080,China Loncin Industry Co.,Ltd.,Chongqing 400080,ChinaDepartment of Materials Science and Engineering,The Ohio State University,Columbus,OH 43210,USANational Engineering Research Center for Magnesium Alloys,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,ChinaCollege of Materials Science and Engineering,Yangtze Normal University,Chongqing 408100,ChinaChongqing Key Laboratory of Materials Surface&Interface Science,Chongqing University of Arts and Sciences,Chongqing 402160,ChinaSchool of Metallurgy and Material Engineering,Chongqing University of Science and Technology,Chongqing 401331,ChinaCollege of Materials Science and Engineering,Yangtze Normal University,Chongqing 408100,China Chongqing Jiulongyuan High-tech Industry Group Co.,Ltd.,Chongqing 400080,China
金属材料
AZ91Dmild steelinterface reactionintermetallic growthkinetics
《China Foundry》 2024 (002)
P.159-167 / 9
supported by the Natural Science Foundation of Chongqing,China(Grant Nos.cstc2020jcyj-msxm X0544,CSTB2022NSCQ-MSX0352,CSTB2022NSCQ-MSX0891,cstc2020jcyj-msxm X0184);Scientific and Technological Research Program of Chongqing Municipal Education Commission(Grant No.KJQN202001416);National Natural Science Foundation of China(Grant Nos.11847077,52001028)。
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