High Strength Aluminum Alloy Sheets Fabricated by Twin Roll Casting for Automobile Application

In this work, a Al-Cu-Li alloy plate with outstanding mechanical properties was successfully prepared with electromagnetic twin-roll casting (TRC) technology. The microstructure of Al-Cu-Li alloy manufactured by conventional mold casting, TRC, and electromagnetic TRC was studied in detail. The action mechanism of electromagnetic oscillation field (EOF) in the TRC process was studied by systematic experimental characterization and numerical simulation. The results show that the EOF will enlarge the circumfluence area in the cast-rolling zone, accelerate the mass transfer and heat transfer in the molten pool, and make the solute field and flow field in the liquid cavity tend to be evenly distributed. Further, the introduction of the EOF will produce the electromagnetic body force F with the maximum strength of 14 N/m3. The F acting on the solidification front will eliminate the accumulation and deposition of Cu2+, Li+, Mg2+, Zn2+, Mn2+ at the dendrite tip and inhibit the growth of dendrites. At the same time, the F can refine the microstructure of the TRC plate, promote the formation of equiaxed crystals, improve the supersaturated solid solubility of solute elements in the a(Al) matrix, and avoid the appearance of obvious solute segregation area or the formation of excessive solute enrichment area. Therefore, the macro-segregation in TRC plate was significantly reduced, the solidification structure was dramatically refined, and the comprehensive properties of the alloy were remarkably improved.

Download Full-text

Effect of Magnetostatic Field on Microstructure of 7075 Aluminum Alloy Strip Manufactured by Twin-Roll Casting

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.2427 ◽

2013 ◽

Vol 652-654 ◽

pp. 2427-2431 ◽

Cited By ~ 3

Author(s):

Xin Su ◽

G M Xu ◽

Y H Feng

Keyword(s):

Electromagnetic Field ◽

Aluminum Alloy ◽

Central Zone ◽

Alloy Strip ◽

7075 Aluminum Alloy ◽

Magnetostatic Field ◽

Dendritic Crystal ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

In this paper, the effect of magnetostatic field on the microstructure and microsegregation of 7075 aluminum alloy strip by twin-roll casting is researched , and the result shows that when no electromagnetic field is applied during the process of roll-casting , the microstructure of 7075 strip is most composed of coarse columnar and dendritic crystal , the direction of grains is equal to roll-casting direction. When the magnetostatic field with 0.13T intensity is applied during the twin-roll casting, the microstructural of strip becomes uniform ,refined and equiaxed at the central zone of strip, and the dendritic crystal at the surficial is disordered and refined significantly.

Download Full-text

Development of Aluminum Alloy AA5754 Production with a Different Magnesium Content by a Twin-Roll Casting Process

Metallurgist ◽

10.1007/s11015-015-0162-x ◽

2015 ◽

Vol 59 (7-8) ◽

pp. 705-711

Author(s):

K. Turbalioglu ◽

Y. Sun ◽

Y. Türen

Keyword(s):

Aluminum Alloy ◽

Casting Process ◽

Magnesium Content ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

Download Full-text

A Novel Approach to Improve the Microstructure and Mechanical Properties of Al–Mg–Si Aluminum Alloys during Twin-Roll Casting

Materials ◽

10.3390/ma13071713 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1713 ◽

Cited By ~ 1

Author(s):

Yong Li ◽

Chen He ◽

Jiadong Li ◽

Zhaodong Wang ◽

Di Wu ◽

...

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Crystallization Front ◽

Alloying Elements ◽

Cast Slab ◽

Energy Dispersion Spectroscopy ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll Cast ◽

Twin Roll

The main purpose of this present study was to investigate the different processing conditions on the microstructure, segregation behavior of alloying elements, and mechanical properties of Al−Mg−Si alloy twin-roll cast slab prepared using a novel twin-roll casting technology. The simulation of temperature field, distribution of alloying elements, tensile properties, hardness, and conductivity were examined by a Leica optical microscope, scanning electron microscopy, energy dispersion spectroscopy, electron probe microanalysis, and tensile tests. The results indicated that when the traditional twin-roll casting method was used to produce aluminum alloy strip, there are obvious centerline segregation defects due to the deep crystallization front depth and symmetrical solidification characteristics. When the forced-cooling technology was applied in the twin-roll casting process, by virtue of the changing of crystallization front depth and crystallization front shape, the segregation defects are obviously suppressed. Suggesting that this method can significantly improve the uniformity of alloying elements in the thickness direction of the twin-roll cast slab, ultimately improve the mechanical properties of AA6022 aluminum alloy.

Download Full-text