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Refinement and growth enhancement of Al2Cu phase during magnetic field assisting directional solidification of hypereutectic Al-Cu alloy.

Wang J, Yue S, Fautrelle Y, Lee PD, Li X, Zhong Y, Ren Z - Sci Rep (2016)

Bottom Line: Understanding how the magnetic fields affect the formation of reinforced phase during solidification is crucial to tailor the structure and therefor the performance of metal matrix in situ composites.With rising magnetic fields, both increase of Al2Cu phase's total volume and decrease of each column's transverse section area were found.To verify this, a real structure based 3D simulation of TEMF in Al2Cu column was carried out, and the dislocations in the Al2Cu phase obtained without and with a 10T high magnetic field were analysed by the transmission electron microscope.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China.

ABSTRACT
Understanding how the magnetic fields affect the formation of reinforced phase during solidification is crucial to tailor the structure and therefor the performance of metal matrix in situ composites. In this study, a hypereutectic Al-40 wt.%Cu alloy has been directionally solidified under various axial magnetic fields and the morphology of Al2Cu phase was quantified in 3D by means of high resolution synchrotron X-ray tomography. With rising magnetic fields, both increase of Al2Cu phase's total volume and decrease of each column's transverse section area were found. These results respectively indicate the growth enhancement and refinement of the primary Al2Cu phase in the magnetic field assisting directional solidification. The thermoelectric magnetic forces (TEMF) causing torque and dislocation multiplication in the faceted primary phases were thought dedicate to respectively the refinement and growth enhancement. To verify this, a real structure based 3D simulation of TEMF in Al2Cu column was carried out, and the dislocations in the Al2Cu phase obtained without and with a 10T high magnetic field were analysed by the transmission electron microscope.

No MeSH data available.


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3D morphology of primary Al2Cu column solidified under different magnetic field flux intensities at the growth rate of 2 μm/s and thermal gradient of 6000 K/m.
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f1: 3D morphology of primary Al2Cu column solidified under different magnetic field flux intensities at the growth rate of 2 μm/s and thermal gradient of 6000 K/m.

Mentions: Figure 1 shows the 3D morphology of primary Al2Cu columns achieved under axial magnetic fields of 0T, 6T and 12T respectively. The eutectic phases, which occupy the interspaces between columns, have been eliminated from the 3D view to expose the Al2Cu phase. Without magnetic field, many typical 90° angles between faces of the columns indicate that these Al2Cu phases are faceted, and it can see that these columns grow continuously in axial direction. The refinement of Al2Cu column can be observed both in transverse and longitudinal sections of the sample obtained under a 6T axial magnetic field, and the decrease of interspaces between columns means the increase of Al2Cu phase’s total volume. Moreover, less 90° angle faces in the columns suggests that the faceted feature of the primary Al2Cu phase tends to transform into a non-faceted appeal. By increasing the magnetic field to 12T, the degrees of refinement and growth enhancement further increase, and Al2Cu phases’ non-faceted feature become dominating.


Refinement and growth enhancement of Al2Cu phase during magnetic field assisting directional solidification of hypereutectic Al-Cu alloy.

Wang J, Yue S, Fautrelle Y, Lee PD, Li X, Zhong Y, Ren Z - Sci Rep (2016)

3D morphology of primary Al2Cu column solidified under different magnetic field flux intensities at the growth rate of 2 μm/s and thermal gradient of 6000 K/m.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835779&req=5

f1: 3D morphology of primary Al2Cu column solidified under different magnetic field flux intensities at the growth rate of 2 μm/s and thermal gradient of 6000 K/m.
Mentions: Figure 1 shows the 3D morphology of primary Al2Cu columns achieved under axial magnetic fields of 0T, 6T and 12T respectively. The eutectic phases, which occupy the interspaces between columns, have been eliminated from the 3D view to expose the Al2Cu phase. Without magnetic field, many typical 90° angles between faces of the columns indicate that these Al2Cu phases are faceted, and it can see that these columns grow continuously in axial direction. The refinement of Al2Cu column can be observed both in transverse and longitudinal sections of the sample obtained under a 6T axial magnetic field, and the decrease of interspaces between columns means the increase of Al2Cu phase’s total volume. Moreover, less 90° angle faces in the columns suggests that the faceted feature of the primary Al2Cu phase tends to transform into a non-faceted appeal. By increasing the magnetic field to 12T, the degrees of refinement and growth enhancement further increase, and Al2Cu phases’ non-faceted feature become dominating.

Bottom Line: Understanding how the magnetic fields affect the formation of reinforced phase during solidification is crucial to tailor the structure and therefor the performance of metal matrix in situ composites.With rising magnetic fields, both increase of Al2Cu phase's total volume and decrease of each column's transverse section area were found.To verify this, a real structure based 3D simulation of TEMF in Al2Cu column was carried out, and the dislocations in the Al2Cu phase obtained without and with a 10T high magnetic field were analysed by the transmission electron microscope.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China.

ABSTRACT
Understanding how the magnetic fields affect the formation of reinforced phase during solidification is crucial to tailor the structure and therefor the performance of metal matrix in situ composites. In this study, a hypereutectic Al-40 wt.%Cu alloy has been directionally solidified under various axial magnetic fields and the morphology of Al2Cu phase was quantified in 3D by means of high resolution synchrotron X-ray tomography. With rising magnetic fields, both increase of Al2Cu phase's total volume and decrease of each column's transverse section area were found. These results respectively indicate the growth enhancement and refinement of the primary Al2Cu phase in the magnetic field assisting directional solidification. The thermoelectric magnetic forces (TEMF) causing torque and dislocation multiplication in the faceted primary phases were thought dedicate to respectively the refinement and growth enhancement. To verify this, a real structure based 3D simulation of TEMF in Al2Cu column was carried out, and the dislocations in the Al2Cu phase obtained without and with a 10T high magnetic field were analysed by the transmission electron microscope.

No MeSH data available.


Related in: MedlinePlus