Effect of a direct magnetic field on the interfacial microstructure between molten aluminium and solid iron was studied. The intermetallic phases formed in the intermetallic layers were investigated by means of electr...Effect of a direct magnetic field on the interfacial microstructure between molten aluminium and solid iron was studied. The intermetallic phases formed in the intermetallic layers were investigated by means of electron probe microanalysis (EPMA) and X-ray diffraction (XRD). It was found that the DC magnetic field can reduce the average thickness of the intermetallic layer and the average aluminium content in the intermetallic layer. Moreover, the intermetallic phases formed in the intermetallic layers are identified as Al3Fe and Al5Fe2 in the absence of the DC magnetic field, while only Al5Fe2 phase present in the presence of the DC magnetic field.展开更多
A pulse magnetic field(PMF)was applied on the hypereutectic A1-23%Si alloy of different temperature range(830-780 ℃,830-730 ℃,830-700 ℃,780-700 ℃,730-700 ℃)during its solidification processing.The influence of pu...A pulse magnetic field(PMF)was applied on the hypereutectic A1-23%Si alloy of different temperature range(830-780 ℃,830-730 ℃,830-700 ℃,780-700 ℃,730-700 ℃)during its solidification processing.The influence of pulse magnetic field on the size and distribution of primary Si was studied.The results show that,the primary Si is very coarse strip,distributs non-unifromly and gathers at the edge of the sample when the alloy solidifies under the condition of no PMF.By applying PMF can significantly refine the primary Si,and make the primary Si distribute uniformly.There has no significant effect on the refinement of primary Si when PMF applied from 830 ℃ to 780 ℃,indicating that PMF has no outstanding effect on the high temperature liquid metal.Applying PMF from 50 ℃ above the liquidus to 30 ℃ below the liquidus(i.e.from liquid to the initial nucleation stage)can get the best refinement result.The refining mechanism of the pulse magnetic field on the solidification structure of Ai-23%Si alloy was discussed,展开更多
基金The paper is supported by National Key Basic Research Pro-gram (973) under grant No. 2005CB623707.
文摘Effect of a direct magnetic field on the interfacial microstructure between molten aluminium and solid iron was studied. The intermetallic phases formed in the intermetallic layers were investigated by means of electron probe microanalysis (EPMA) and X-ray diffraction (XRD). It was found that the DC magnetic field can reduce the average thickness of the intermetallic layer and the average aluminium content in the intermetallic layer. Moreover, the intermetallic phases formed in the intermetallic layers are identified as Al3Fe and Al5Fe2 in the absence of the DC magnetic field, while only Al5Fe2 phase present in the presence of the DC magnetic field.
基金Item Sponsored by National Natural Science Foundation of China[No.51074048]Fundamental Research Funds for the Central Universities[N110408002]
文摘A pulse magnetic field(PMF)was applied on the hypereutectic A1-23%Si alloy of different temperature range(830-780 ℃,830-730 ℃,830-700 ℃,780-700 ℃,730-700 ℃)during its solidification processing.The influence of pulse magnetic field on the size and distribution of primary Si was studied.The results show that,the primary Si is very coarse strip,distributs non-unifromly and gathers at the edge of the sample when the alloy solidifies under the condition of no PMF.By applying PMF can significantly refine the primary Si,and make the primary Si distribute uniformly.There has no significant effect on the refinement of primary Si when PMF applied from 830 ℃ to 780 ℃,indicating that PMF has no outstanding effect on the high temperature liquid metal.Applying PMF from 50 ℃ above the liquidus to 30 ℃ below the liquidus(i.e.from liquid to the initial nucleation stage)can get the best refinement result.The refining mechanism of the pulse magnetic field on the solidification structure of Ai-23%Si alloy was discussed,
