Comparative study on effects of microstructures of hot rolled and twin roll casting 1235 aluminium alloy on surface quality of aluminium foils produced

2011 ◽  
Vol 27 (4) ◽  
pp. 761-766 ◽  
Author(s):  
Y Z Zhu ◽  
R Y Huang ◽  
Z Zhu ◽  
Z D Xiang
Keyword(s):  
Comparative Study ◽  
Aluminium Alloy ◽  
Surface Quality ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Hot Rolled ◽  
Twin Roll

Microstructure and Tensile Properties of Al-(5~10)wt%Mg Alloy Sheets Fabricated by Twin Roll Casting and Rolling Process

2010 ◽  
Vol 443 ◽  
pp. 45-50 ◽  
Author(s):  
Hyoung Wook Kim ◽  
Jae Hyeng Cho ◽  
Cha Yong Lim ◽  
Suk Bong Kang
Keyword(s):  
Tensile Properties ◽  
Surface Quality ◽  
Intermetallic Particle ◽  
Process Condition ◽  
High Strength ◽  
Mg Alloy ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

High strength Al-Mg alloy strips with high Mg contents (5-10wt%Mg) were successfully fabricated by twin roll casting. In order to get a good surface quality of Al-Mg strips, an optimum process condition was investigated in this experiment. The morphology of the cast nozzle and the roll separate force during twin roll casting was important to improve the surface quality of the strip and homogeneity of the cast structure through the thickness. The size of intermetallic particle like Al-Fe compounds was reduced down to 1~2m due to a high cooling rate of Al melt during strip casting. In addition, the dendrite structure was very fine and the segregation of Al8Mg5 phase between grains was remarkably reduced. Therefore, the Al-Mg strips have good workability during additional cold/warm rolling processes. After annealing, the rolled sheets have superior tensile properties to a commercial high strength Al-Mg alloy sheet.

scholarly journals Influence of Twin-Roll Casting Speed on Microstructural Homogeneity, Centerline Segregation, and Surface Quality of Three Different Mg Alloys

JOM ◽  
2021 ◽  
Author(s):  
J. Victoria-Hernández ◽  
G. Kurz ◽  
J. Bohlen ◽  
S. Yi ◽  
D. Letzig
Keyword(s):  
Surface Quality ◽  
Az31 Alloy ◽  
Mg Alloys ◽  
Centerline Segregation ◽  
Twin Roll Casting ◽  
Fine Grained ◽  
Roll Casting ◽  
Columnar Grains ◽  
Twin Roll

AbstractIn this work, the influence of twin-roll casting (TRC) speed on the microstructure of the through-thickness uniformity, centerline segregation, and surface quality of three wrought Mg alloys was investigated. The microstructural features of the AZ31, ZX11, and ZWK200 alloys produced at TRC speeds ranging from 1.8 m/min to 2.2 m/min (for the AZ31 and ZWK200), and 1.5–2.5 m/min (for the ZX11 alloy) were analyzed. There were clear differences in the microstructure uniformity depending on the alloy composition. Columnar grains coexisting with globular grains were found in the AZ31 and ZX11 alloys, whereas the ZWK200 alloy showed a homogeneous fine-grained microstructure characterized by a weaker texture even at the highest TRC speed used. While there is a tendency to reduce the centerline segregation as the TRC speed is decreased during casting of the AZ31 alloy, the formation of this defect cannot be prevented in the ZX11 and ZWK200 alloys by only varying the TRC speed.

Properties of Magnesium Strips Produced by Twin-Roll-Casting and Hot Rolling

2011 ◽  
Vol 690 ◽  
pp. 21-24 ◽  
Author(s):  
Rudolf Kawalla ◽  
Madlen Ullmann ◽  
Christian Schmidt ◽  
Joanna Dembińska ◽  
Hans Peter Vogt
Keyword(s):  
Mechanical Properties ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll Cast ◽  
Hot Rolled ◽  
Twin Roll ◽  
Metallurgical Processes ◽  
Positive Effect ◽  
Strength And Ductility

The combination of Twin-Roll-Casting (TRC) and subsequent rolling constitutes the most promising process chain for producing magnesium strips economically. Fast solidification (10 times faster than continuous casting) combined with partial deformation lead to a fine primary microstructure as well as less shrinking holes, pores, segregations and brittle precipitations which all together has a very positive effect on forming behavior of the initial material and quality of the final product. The paper elaborates on metallurgical processes in consideration of microstructure and texture results and on the obtained mechanical properties of TRC magnesium strips and finished strips. In addition, the influence of twin-roll-cast and rolling conditions on the mechanical properties will be discussed. The investigation has also been expanded to possible heat treatments and their influence. Concluding remarks will be made on results of rolling trail which were carried out on an industrial scale rolling mill, revealing that the production of hot rolled thin sheets of magnesium alloy AZ31 is possible with a very promising combination of strength and ductility.

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