scholarly journals Effects of SiCp on microstructures of semi-solid extruded AZ91D magnesium alloys in recrystallization process

China Foundry ◽  
2021 ◽  
Vol 18 (6) ◽  
pp. 565-573
Author(s):  
Ao-xue Jiang ◽  
Zhi-yong You ◽  
Zhuang-zheng Duan ◽  
Gang-ping Qiao ◽  
Jin-shan Zhang ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Recrystallization Process ◽  
Semi Solid

scholarly journals Cyclic Deformation of Semi-solid Processed Magnesium Alloys

2021 ◽  
Author(s):  
Himesh Patel
Keyword(s):  
Fatigue Life ◽  
Magnesium Alloys ◽  
Strain Amplitude ◽  
Cyclic Deformation ◽  
Weight Ratio ◽  
Aging Treatment ◽  
Strain Ratio ◽  
Plastic Strain Amplitude ◽  
Total Strain Amplitude ◽  
Semi Solid

To improve fuel economy and reduce greenhouse gas emissions, magnesium alloys are being considered for automotive and aerospace applications because of their high strength-to-weight ratio. The objective of this thesis was to study monotonic and cyclic deformation behavior of two semi-solid processed (thixomolded) magnesium alloys, AZ91D and AM60B. The fatigue life of these thixomolded alloys was observed to be higher than that of their die cast counterparts. As the total strain amplitude increased, the stress amplitude and plastic strain amplitude increased, while the pseudoelastic modulus decreased. The change in the modulus was attributed to the nonlinear (pseudoelastic) behavior caused by twinning-detwinning during cyclic deformation. The fatigue life increased with decreasing strain ratio, and partial mean stress relaxation occurred mainly in the initial 10-20% of the fatigue life. The fatigue life of theAM60B alloy improved after solution or solution-aging treatment, and the monotonic strength increased by aging, while the thixomolded condition itself exhibited moderate monotonic strength and fatigue life.

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.

Mold Filling Simulation of Semi-Solid Magnesium Alloys

2008 ◽  
pp. 231-236
Author(s):  
Florin Ilinca ◽  
Jean François Hétu ◽  
Frank Ajersch ◽  
Jean François Moisan
Keyword(s):  
Magnesium Alloys ◽  
Mold Filling ◽  
Semi Solid ◽  
Filling Simulation

Application of Semi-Solid Forming to Magnesium Alloys with High Al and Zn Contents

2003 ◽  
Vol 419-422 ◽  
pp. 629-634 ◽  
Author(s):  
Nyoman Antara ◽  
Katsumi Suzuki ◽  
Toru Kayuta ◽  
Shigeharu Kamado ◽  
Yo Kojima
Keyword(s):  
Magnesium Alloys ◽  
Semi Solid

Numerical Simulation of Mould Filling in Rheo-Diecasting Process of Semi-Solid Magnesium Alloys

2006 ◽  
Vol 116-117 ◽  
pp. 554-557 ◽  
Author(s):  
Shu Sen Wu ◽  
Jun Wen Zhao ◽  
Li Wan ◽  
Jirong Luo
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Computer Program ◽  
Magnesium Alloys ◽  
Experimental Results ◽  
Air Entrapment ◽  
Mould Filling ◽  
Slurry Flows ◽  
Semi Solid ◽  
Numeral Simulation

The mould-filling behavior of rheo-diecasting of semi-solid magnesium alloy and diecasting of liquid magnesium alloy has been simulated with the computer program of numerical simulation developed by the authors. Results show that, under the same diecasting conditions, the filling behavior of rheo-diecasting of semi-solid metals is similar to the liquid diecasting, but mould filling of semi-solid slurry is steadier, and the slurry flows into the mould in a state similar to lamellar flow. The air entrapment in semi-solid process is much smaller than that of liquid diecasting, and the castings made with semi-solid rheo-diecasting excel those with liquid diecasting in quality. Experimental results are in accord with the results of numeral simulation.

scholarly journals Microstructural changes of strained AZ91D magnesium alloys on semi-solid state.

1995 ◽  
Vol 45 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Shinji MATSUI ◽  
Kazutoshi SEKIHARA ◽  
Shigeharu KAMADO ◽  
Yo KOJIMA
Keyword(s):  
Solid State ◽  
Magnesium Alloys ◽  
Microstructural Changes ◽  
Semi Solid

scholarly journals Microstructures in Friction-Stir Welded Dissimilar, Semi-Solid-Cast Magnesium Alloys

2003 ◽  
Vol 9 (S02) ◽  
pp. 700-701
Author(s):  
A. C. Somasekharan ◽  
W. C. Davis ◽  
L. E. Murr
Keyword(s):  
Magnesium Alloys ◽  
Friction Stir ◽  
Cast Magnesium Alloys ◽  
Semi Solid ◽  
Cast Magnesium

scholarly journals Semi-Solid Forming of Magnesium Alloys.

Materia Japan ◽  
1998 ◽  
Vol 37 (2) ◽  
pp. 89-92
Author(s):  
Kenji Miwa
Keyword(s):  
Magnesium Alloys ◽  
Semi Solid

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.

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