scholarly journals Study on Semi-Solid Magnesium Alloys Slurry Preparation and Continuous Roll-Casting Process

10.5772/13505 ◽  
2011 ◽  
Author(s):  
Shuisheng Xie ◽  
Youfeng He ◽  
Xujun Mi
Keyword(s):  
Magnesium Alloys ◽  
Casting Process ◽  
Roll Casting ◽  
Semi Solid ◽  
Slurry Preparation

Continuous Casting of Magnesium Billets for Semi-Solid Processing

2005 ◽  
Vol 475-479 ◽  
pp. 517-520
Author(s):  
Hwa Chul Jung ◽  
Kwang Seon Shin
Keyword(s):  
Aluminum Alloys ◽  
Continuous Casting ◽  
Magnesium Alloys ◽  
Casting Process ◽  
Az91 Alloy ◽  
Attractive Alternative ◽  
Limited Information ◽  
Continuous Casting Process ◽  
Dendritic Microstructure ◽  
Semi Solid

Semi-solid processing is recognized as an attractive alternative method for the near net-shape production of engineering components. Although there has been a significant progress in semi-solid processing of aluminum alloys, very limited information is available on semi-solid processing of magnesium alloys, except for the thixomolding process. Continuous casting process has been utilized to produce the billets with the desirable cross-section at a reduced production cost for many metals, such as steel, copper and aluminum alloys. It has also been commercially utilized to produce the aluminum billets with non-dendritic microstructure for subsequent thixocasting process. However, continuous casting of magnesium billets for semi-solid processing has not yet been commercialized due to the difficulties involved in casting of magnesium alloys. In the present study, a continuous casting process has been developed for the production of the cylindrical billets of magnesium alloys for the subsequent thixocasting process. In order to obtain the desired non-dendritic microstructure with an excellent degree of homogeneity both in microstructure and composition, an electromagnetic stirring system has been utilized. A continuous casting process has been proven to be an efficient way to produce the high quality billets of magnesium alloys for semi-solid processing. A prototype air conditioner cover was produced using the continuously cast billets of AZ91 alloy.

Manufacturing and Application of Continuous Cast Semi-Solid Processed Magnesium Alloys

2005 ◽  
Vol 488-489 ◽  
pp. 397-400
Author(s):  
Hwa Chul Jung ◽  
Ye Sik Kim ◽  
Kwang Seon Shin
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
New Technology ◽  
Casting Process ◽  
Heat Treatments ◽  
Air Conditioner ◽  
Semi Solid ◽  
Cast Magnesium ◽  
Pressure Die Casting

The demand for magnesium alloys has increased significantly during the past decade in the automotive and electronic industries where weight reduction becomes increasingly an important issue. At present, high-pressure die casting (HPDC) is a dominant process in production of magnesium alloy components. However, magnesium alloy components produced by HPDC suffer from porosity problem and this limits the enhancement of mechanical properties through subsequent heat treatments. The semi-solid processing (SSP) is an emerging new technology for near-net shape production of engineering components, in which the alloys are processed in the temperature range where the liquid and solid phases coexist. The SSP has various advantages over the conventional casting processes. It offers the castings with high integrity and less porosity and allows subsequent heat treatments for enhancement of mechanical properties. For these advantages, the SSP of magnesium alloys has received increasing attention in recent years. In the present study, the continuous casting process was developed for the production of magnesium billets for the subsequent SSP. The process utilizes an electromagnetic stirring system in order to obtain desired microstructure with an excellent degree of homogeneity in both microstructure and composition. Prototypes of an air conditioner cover and a telescope housing were produced using the SSP of the continuously cast magnesium alloy billets.

Semi-solid manufacturing process of magnesium alloys by twin-roll casting

2004 ◽  
Vol 155-156 ◽  
pp. 1662-1667 ◽  
Author(s):  
H. Watari ◽  
K. Davey ◽  
M.T. Rasgado ◽  
T. Haga ◽  
S. Izawa
Keyword(s):  
Magnesium Alloys ◽  
Manufacturing Process ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Semi Solid ◽  
Twin Roll

Study on Semi-Solid Continuous Roll-Casting Strips of AZ91D Magnesium Alloy

2008 ◽  
Vol 141-143 ◽  
pp. 469-473
Author(s):  
Shui Sheng Xie ◽  
You Feng He ◽  
Guo Jie Huang ◽  
Mao Peng Geng ◽  
Ying Zhang
Keyword(s):  
Magnesium Alloy ◽  
Cold Rolling ◽  
Hot Rolling ◽  
Casting Process ◽  
High Quality ◽  
Az91d Magnesium Alloy ◽  
Roll Casting ◽  
Semi Solid ◽  
Hot And Cold Rolling ◽  
Process Ability

Semi-solid Continuous roll-casting process applied to produce the AZ91D magnesium strips and its microstructure was studied in this paper. In order to examine further process ability and forming property of the roll-casting strips, hot and cold rolling and punching experiments were investigated. It was clarified that it is significant to combine the semi-solid process techniques with roll-casting techniques, through which we can get high quality magnesium alloy strips with nondendritic structure and improve the overall properties of the products. The largest deformation by cold rolling and hot rolling can reach 18% and 21% respectively with one-pass roller.

Development of Slurry Preparation Method by Applying Mechanical Vibration

2019 ◽  
Vol 285 ◽  
pp. 333-338
Author(s):  
Yuichiro Murakami ◽  
Kenji Miwa ◽  
Masayuki Kito ◽  
Takashi Honda ◽  
Naoki Omura
Keyword(s):  
Aluminum Alloys ◽  
Preparation Method ◽  
Mechanical Vibration ◽  
Casting Process ◽  
Solid Particles ◽  
Astm Standard ◽  
Velocity Amplitude ◽  
Die Casting Process ◽  
Semi Solid ◽  
Slurry Preparation

The preparation of a semi-solid slurry with fine and spherical solid particles dispersed in the liquid phase is a key technology for the semi-solid process. In this study, we have developed the slurry preparation method by applying mechanical vibration for JIS AC4CH (equivalent to A356 in the ASTM standard) and ADC12 (equivalent to A383 in the ASTM standard) aluminum alloys. In this method, the mechanical vibration was applied to the aluminum alloys during cooling from a liquid state to semi-solid state. The shape of the particle was varied by controlling vibration conditions. Therefore, we investigated the effect of conditions on mechanical vibrations. There are four parameters which are frequency, acceleration amplitude, velocity amplitude and displacement amplitude in the mechanical vibration. Among these parameters, the velocity amplitude had highest effects on the shape of solid particles. By properly controlling of the frequency and the velocity amplitude, the slurry with fine and spherical solid particles could be obtained. Moreover, the fraction solid of slurry could be controlled by varied initial liquid temperature. Especially, ADC12 aluminum alloy has low liquid-solid coexistence temperature range, so it is not considered to be suited for the semi-solid process. However, by using this mechanical vibration method, the semi-solid slurry could be obtained stably. This method is expected to be effective for the semi-solid high-pressure die-casting process.

Formability of Magnesium Alloy Sheets Manufactured by Semi-Solid Roll Strip Casting

2004 ◽  
Vol 449-452 ◽  
pp. 181-184 ◽  
Author(s):  
Hisaki Watari ◽  
Nobuhio Koga ◽  
R. Paisarn ◽  
Ryoji Nakamura
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Casting Process ◽  
Solid Material ◽  
Strip Casting ◽  
Drawing Ratio ◽  
Iron And Steel ◽  
Semi Solid ◽  
Molten Magnesium ◽  
Cast Magnesium

An experimental investigation was performed into the formability of magnesium alloy sheets that were hot-rolled after a semi-solid roll strip casting process. Semi-solid forming helps reduce the total product weight if the semi-solid material produced by light metals, such as aluminum and magnesium can be used to replace conventional iron and steel products. However, the problems of utilizing magnesium alloys are still related to high manufacturing costs. This means that improved quality must be balanced by economic validity. Magnesium alloy AZ31B was used in this experiment to ascertain the effectiveness of semi-solid roll strip casting for producing magnesium alloy sheets. The temperature of the molten magnesium, and the roll speeds of the upper and lower rolls, (which could be changed independently), were varied to find an appropriate manufacturing condition. Rolling conditions and heat treatment were changed to examine which condition would be appropriate for producing wrought magnesium alloys with good formability. Microscopic observation of the crystals of the finished products was performed. It has been found that a limiting drawing ratio of 2.4 was possible in a deep drawing process of the cast magnesium alloy sheets.

Numerical Simulation of Semi-Solid Magnesium Alloy in Continuous Roll-Casting Process

2006 ◽  
Vol 116-117 ◽  
pp. 583-586 ◽  
Author(s):  
Shui Sheng Xie ◽  
Hao Qiang Yang ◽  
Lei Li ◽  
Guo Jie Huang
Keyword(s):  
Heat Transfer ◽  
Magnesium Alloy ◽  
Dendritic Structure ◽  
Casting Process ◽  
Inlet Temperature ◽  
Technical Parameters ◽  
Roll Casting ◽  
Semi Solid ◽  
Strip Quality ◽  
Volume Method

It is significative to link the semi-solid process and continuous roll-casting process (CRP), through which we can get high quality magnesium alloy strips with non-dendritic structure and improve the overall properties of the products. Furthermore, because CRP of semi-solid metal combines casting and forming, it shortens the period of technological process. In general, several technical parameters such as the inlet temperature of semi-solid slurry, the heat transfer between roll and molten alloy, the roll-casting speed, the position of solidification final point influence on the strip quality in continuous roll-casting process. Therefore, the effects of the parameter to continuous roll-casting process should be investigated. In this paper, the finite volume method is used in the analysis of the CRP, a two-dimensional incompressible non-Newtonian flow with heat transfer is considered. Based on the simulated results, the optimizational technical parameters are obtained and the experiment of CRP was carried out. An ideal AZ91D strip with non-dendritic structure has been obtained and also has been tested by cold rolling and hot rolling. The results show that microstructure and mechanical properties of the strip are fine.

scholarly journals Effect of Temperature Semi-solid Casting Process on AZ91D Magnesium Alloys to Hardness and Microstructures

2019 ◽  
Vol 30 (1) ◽  
pp. 18-22
Author(s):  
Kusharjanto Kusharjanto ◽  
Sutarno Sutarno ◽  
R. Henny Mulyani
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Grain Shape ◽  
Casting Process ◽  
Effect Of Temperature ◽  
Hardness Testing ◽  
Lightweight Structures ◽  
Semi Solid

This study investigates the effect of temperature semi-solid casting process for magnesium alloys AZ91D in an effort to increase the mechanical properties for the application of lightweight structures. In this experiments, semi-solid casting process is varied temperatures ranging from 500, 510, 520, 530 and 540°C. Results of hardness testing obtained the highest average is 64.4 BHN at a temperature of 500°C, which higher than the as-cast 42.56 BHN (an increase of 33.91%). The increasing of hardness occur because of changes in the microstructure of dendrite structures into globular grains, which have α-Mg phase and ß-Mg17Al12. Small spherical grain shape and spread evenly with a size of 40.08 μm obtained at temperatures of 500°C and size 77.2 μm at temperatures 540°C.

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