Effect of Aluminum Content on Mechanical Properties of Cast Magnesium Alloy Sheets Fabricated by Twin-Roll Casting

2010 ◽  
Vol 97-101 ◽  
pp. 1077-1080 ◽  
Author(s):  
Hisaki Watari ◽  
Yoshimasa Nishio ◽  
Ryoji Nakamura ◽  
Keith Davey ◽  
Nobuhio Koga
Keyword(s):  
Magnesium Alloy ◽  
Aluminum Content ◽  
Roll Speed ◽  
Vertical Roll ◽  
Roll Casting ◽  
High Aluminum Content ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium ◽  
Twin Roll ◽  
High Aluminum

This paper describes the twin-roll casting technology of magnesium alloys that contain relatively high weight ratios of aluminum, such as AM60, AZ91 and AZ121. The magnesium alloy sheets were cast by a vertical roll caster to manufacture relatively high-strength Mg alloys with high aluminum content. The influences of such process parameters as roll materials, casting temperature, and roll speed were ascertained. A simple method of predicting the convection heat transfer coefficient between casting rolls and molten metal is introduced. The microstructures of cast magnesium alloy sheets are microscopically observed to investigate the effects of roll-casting conditions on crystal growth in the cast products. It was found that Mg alloys with high aluminum content can be fabricated at a roll speed of 90m/min with a vertical-roll caster. The grain size of the manufactured wrought magnesium alloy sheet was about 30 micrometers due to rapid solidification in the proposed process.

Mechanical Properties and Metallurgical Qualities of High Aluminum Content Magnesium Alloys Fabricated by Twin-Roll Casting

2010 ◽  
Vol 654-656 ◽  
pp. 1440-1443 ◽  
Author(s):  
Hisaki Watari ◽  
Yoshimasa Nishio ◽  
Mayumi Suzuki ◽  
Ryoji Nakamura ◽  
Nobuhio Koga ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Aluminum Content ◽  
Mg Alloys ◽  
Roll Speed ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
High Aluminum Content ◽  
Twin Roll ◽  
High Aluminum

This paper describes the twin-roll casting technology of magnesium alloys that contain relatively high weight ratios of aluminum, such as AZ91, AZ101 and AZ111. The magnesium alloy sheets were cast by a horizontal twin roll caster to manufacture relatively high-strength Mg alloys with high aluminum content. The influences of such process parameters as casting temperature and roll speed were ascertained. The microstructures of cast magnesium alloy sheets are observed to investigate the effects of roll-casting conditions on crystal growth in the cast products. It was found that Mg alloys with high aluminum content can be fabricated at a roll speed of 15 m/min with a horizontal-roll caster. The grain size of the manufactured wrought magnesium alloy sheet was about 10 micrometers due to rapid solidification in the proposed process.

Effects of Aluminum Content on Plastic Formability of Wrought Mg Alloy Sheet Produced by Twin-Roll Casting Process

2011 ◽  
Vol 675-677 ◽  
pp. 667-670 ◽  
Author(s):  
Hisaki Watari ◽  
Yoshimasa Nishio ◽  
Mayumi Suzuki ◽  
Toshio Haga ◽  
Keith Davey ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Aluminum Content ◽  
Alloy Sheet ◽  
Mg Alloys ◽  
Roll Speed ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
High Aluminum Content ◽  
Twin Roll ◽  
High Aluminum

A total weight reduction approach has been key issue for car manufacturers to cope with more and more stringent requirements for fuel economy. This paper describes the twin-roll casting technology of magnesium alloys that contain relatively high weight ratios of aluminum, such as AZ91,AZ101 and AZ111. The magnesium alloy sheets were cast by a horizontal twin roll caster to manufacture relatively high-strength Mg alloys with high aluminum content. The influences of such process parameters as casting temperature and roll speed were ascertained. The microstructures of cast magnesium alloy sheets were observed to investigate the effects of roll-casting conditions on crystal growth in the cast products. It was found that Mg alloys with high aluminum content can be fabricated at a roll speed of 15 m/min with a horizontal-roll caster. The grain size of the manufactured wrought magnesium alloy sheet was about 10 μm due to rapid solidification in the proposed process.

Hot Forging of Roll-Cast Magnesium Alloys with High Aluminum Content

2018 ◽  
Vol 789 ◽  
pp. 187-194
Author(s):  
Sueji Hirawatari ◽  
Hisaki Watari ◽  
Shinichi Nishida ◽  
Mayumi Suzuki ◽  
Toshio Haga
Keyword(s):  
Grain Size ◽  
Magnesium Alloys ◽  
Aluminum Content ◽  
Hot Forging ◽  
Roll Casting ◽  
High Aluminum Content ◽  
Cast Magnesium ◽  
Twin Roll Cast ◽  
Twin Roll ◽  
High Aluminum

This paper deals with characteristics of hot forging of twin roll cast magnesium alloyswhich have relatively high aluminum content. High tensile strength magnesium alloys containing 9 to12% aluminum, such as Mg-9%Al-1%Zn, Mg-10%Al-1%Zn, Mg-11%Al-1%Zn, andMg-12%Al-1%Zn have been made by twin roll casting. A new experiment was performed for hotforging of high strength magnesium alloys with high aluminum content was performed. From theresults, using magnesium alloys with high aluminum content yielded less compressive deformationresistance than AXM403. It was also demonstrated that hot forging of magnesium alloys with highaluminum content produces small magnesium crystals (about six micro meters) and crystallizedsubstances. The mean grain size of the microstructure of Mg-12%Al-1%Zn forged at 623K was lessten micrometers although that of the Mg-9%Al-1%Zn was about thirty micrometers. The small betaphase which precipitates in the twin roll cast Mg-12%Al-1%Zn was distributed uniformly comparingto Mg-9%Al-1%Zn. From the result of microscopic observation of the forged products, it has beenrecognised that the Hall-petch rule between mean grain size of forged materials and Vickers hardnesshas been proved. The effects of the dynamic recrystallization on the microstructures of the twin-rollcast products seem to be different in terms of aluminum content. Due to rapid cooling of twin-rollcasting process process, the fabricated magnesium material could be used for hot forging. By applyinga servo press machine, a hot-forging experiment was performed with development of high strengthmagnesium alloys. A novel material that show higher hardness have been fabricated by usingtwin-roll casting process. It has also been clarified that the aluminum content affect precipitation ofbeta phase as well as grain size.

712 Twin roll casting of wrought high aluminum content Mg alloys

2012 ◽  
Vol 2012.20 (0) ◽  
pp. _712-1_-_712-5_
Author(s):  
Yuya YAMAMOTO ◽  
Hideto HARADA ◽  
Masaki ENDO ◽  
Shinichi NISHIDA ◽  
Mayumi SUZUKI ◽  
...  
Keyword(s):  
Aluminum Content ◽  
Mg Alloys ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
High Aluminum Content ◽  
Twin Roll ◽  
High Aluminum

Casting of High Aluminum Content AM Series Magnesium Alloys by Using a Horizontal Twin Roll Caster

2020 ◽  
Vol 841 ◽  
pp. 340-345
Author(s):  
Hotaka Tozuka ◽  
Kanae Seki ◽  
Hisaki Watari ◽  
Toshio Haga
Keyword(s):  
Magnesium Alloys ◽  
Aluminum Content ◽  
Hot Forging ◽  
Original Material ◽  
Roll Casting ◽  
Average Grain Size ◽  
High Aluminum Content ◽  
Twin Roll Caster ◽  
Twin Roll ◽  
High Aluminum

In this paper, twin roll casting of magnesium alloys with high aluminum content such as, Mg-11 mass%Al-0.2 mass%Mn, Mg-12 mass%Al-0.2 mass%Mn, Mg-13 mass%Al-0.2 mass% have been performed for the purpose of use as an original material for hot forging. Also the mechanical properties of the cast materials were examined. A 10 miri-meters thick strip was cast by the use of a horizontal twin roll caster. The microscopic observation was conducted to investigate into the precipitation of the metal compounds such as Mg17Al12, and the Vickers hardness of the cast strips test were performed. From the result of the roll casting experiments, a 10 mm thick strip was continuously cast at a roll speed of 3.1 m/min. The average grain size of the casting strips was about 46 micron meters. When the aluminum content was 13%, the hardness of the twin roll cast (TRC) strips became 1.7 times higher than that of extruded AZ 31. Also, a uniaxial compression test at elevated temperature was conducted to obtain a true strain-true stress curve for examining possibility of direct hot forging (DHF) of TRC magnesium alloys with high aluminum content.

An XPS Study of Native Oxide and Isothermal Oxidation Kinetics at 300 °C of AZ31 Twin Roll Cast Magnesium Alloy

2013 ◽  
Vol 81 (5-6) ◽  
pp. 529-548 ◽  
Author(s):  
H. Saleh ◽  
T. Weling ◽  
J. Seidel ◽  
M. Schmidtchen ◽  
R. Kawalla ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Oxidation Kinetics ◽  
Isothermal Oxidation ◽  
Native Oxide ◽  
Cast Magnesium Alloy ◽  
Cast Magnesium ◽  
Xps Study ◽  
Twin Roll Cast ◽  
Twin Roll

Thermal Flow-Solidification Simulation and Analysis of Strip Defects in Vertical Twin-Roll Casting of Magnesium Alloy

2015 ◽  
Vol 833 ◽  
pp. 15-18 ◽  
Author(s):  
Zhi Pu Pei ◽  
Dong Ying Ju ◽  
Hong Yang Zhao ◽  
Xiao Dong Hu
Keyword(s):  
Temperature Distribution ◽  
Magnesium Alloy ◽  
Casting Process ◽  
Thermal Flow ◽  
Twin Roll Casting ◽  
Solidification Simulation ◽  
Roll Casting ◽  
Pool Level ◽  
Cast Magnesium ◽  
Twin Roll

A quantitative understanding of the twin-roll casting process is required to get high quality as-cast magnesium alloy strips. In this paper, a thermal flow-solidification simulation was carried out to study the behavior of casting zone and its effects on defects generation deeply. Results show that a lower pouring temperature is not suitable for producing defect-free magnesium alloy strips. With increasing of the casting speed, the tendency of cracks formation will getting smaller because of the more uniform temperature distribution. A low pool level leads to a small metal-roll contact area, and a sharp temperature distribution will generates under this situation, which is not good for strips quality.

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