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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.


Related in: MedlinePlus

Total volume of the Al2Cu phase and transverse section area of each Al2Cu column plotted as a function of applied magnetic field flux intensities.
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f2: Total volume of the Al2Cu phase and transverse section area of each Al2Cu column plotted as a function of applied magnetic field flux intensities.

Mentions: To confirm and quantify the refinement and growth enhancement of Al2Cu phase under magnetic field, the transverse section area of each column and their total volume were respectively calculated based on the 3D tomography data and plotted as a function of magnetic fields as shown in Fig. 2. It clearly shows that the total volume of primary Al2Cu phase increase with the magnetic fields, and reversely the transverse section area of each column gradually decrease. The decreased area indicates the refinement of the Al2Cu column. The 3D structure quantification shows that all the Al2Cu columns contacting with each other, which is understandable because columns may contact during growth or initially grow from the same seed. This makes identifying a single Al2Cu column difficult, and thus its transverse section area but not the volume was used to indicate the refinement effect. Better than cutting the sample into a number of slices and then measuring the transverse section area of columns in each slice to minimize the error, we can easily get sufficient slices using the tomography data. To more precise, the transverse section area of each Al2Cu column in Fig. 2 was produced by averaging that from 60 slices over the sample.


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)

Total volume of the Al2Cu phase and transverse section area of each Al2Cu column plotted as a function of applied magnetic field flux intensities.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: Total volume of the Al2Cu phase and transverse section area of each Al2Cu column plotted as a function of applied magnetic field flux intensities.
Mentions: To confirm and quantify the refinement and growth enhancement of Al2Cu phase under magnetic field, the transverse section area of each column and their total volume were respectively calculated based on the 3D tomography data and plotted as a function of magnetic fields as shown in Fig. 2. It clearly shows that the total volume of primary Al2Cu phase increase with the magnetic fields, and reversely the transverse section area of each column gradually decrease. The decreased area indicates the refinement of the Al2Cu column. The 3D structure quantification shows that all the Al2Cu columns contacting with each other, which is understandable because columns may contact during growth or initially grow from the same seed. This makes identifying a single Al2Cu column difficult, and thus its transverse section area but not the volume was used to indicate the refinement effect. Better than cutting the sample into a number of slices and then measuring the transverse section area of columns in each slice to minimize the error, we can easily get sufficient slices using the tomography data. To more precise, the transverse section area of each Al2Cu column in Fig. 2 was produced by averaging that from 60 slices over the sample.

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