Application of Computational Thermodynamics and Calphad in Magnesium Alloy Development

2013 ◽  
pp. 3-8 ◽  
Author(s):  
Alan A. Luo
Keyword(s):  
Magnesium Alloy ◽  
Alloy Development ◽  
Computational Thermodynamics

Evaluation of Magnesium Extrusion Production

2005 ◽  
Vol 488-489 ◽  
pp. 483-486 ◽  
Author(s):  
Ming Zhou ◽  
Jianyong Cao ◽  
Fulin Yu ◽  
Xia Wei
Keyword(s):  
Magnesium Alloy ◽  
High Pressure Processing ◽  
Alloy Development ◽  
Molding Process ◽  
Specific Strength ◽  
Hexagonal Close Packed ◽  
Slip Planes ◽  
Copper Zinc ◽  
Increasing Temperature ◽  
Development Application

Compared with any other pressure processing methods, extrusion is more prone to develop the plasticity of the metal. Extrusions have much better size precision and surface quality than products by rolling and forging. As one-shot molding process, extrusion can eliminate some machining. In addition, extrusions have very high strengths and elongations because of their compact interior structures and fine grains. This paper summarizes some experiences and plans in extrusion production of CQMST(Chongqing Magnesium Science & Technology Co.Ltd). Magnesium, a plentiful element with density of 1.78g/cm3，2/3 of aluminum and 1/4 of steel, is characterized by its high specific strength and toughness, good dumping performance, thermal conductivity and electromagnetism shielding as well as recyclability. Following the advancing technologies of magnesium smelting, high pressure processing, surface treatment and soldering since 1990’s, the prices of magnesium and its ingot stepped down. As an important light engineering material, magnesium application is growing at annual speed of 15%, much higher than aluminum, copper, zinc, nickel and steel. In China, magnesium and magnesium alloy development, application and industrialization has been placed on the National “Tenth Five-year Plans” and the National “863” Scheme, which indicated the coming of new age for magnesium and magnesium alloy development and application in China. In the past, most of the magnesium products were produced by casting, especially die casting and thixomolding. It’s always considered that the crystal structure of magnesium is hexagonal close-packed, and only two slip planes exist at room temperature, so compared with other alloys, it’s very difficult to produce magnesium parts by forging, rolling or extrusion. Nevertheless, practice showed that if heated to a certain temperature, magnesium extrusion may not be hard work, and even easier than 5056 and 2024 aluminum. When extruded with distributary die, magnesium alloy can have better soldering performance than aluminum alloys mentioned above, just because new slip system forms along with increasing temperature (>225°C) and accordingly increases the plasticity of magnesium.

Magnesium Alloy Development using Phase Equilibria Computation and Microstructure Validation

2012 ◽  
pp. 1-3 ◽  
Author(s):  
A.A. Luo ◽  
R.K. Mishra ◽  
B.R. Powell ◽  
A.K. Sachdev
Keyword(s):  
Magnesium Alloy ◽  
Phase Equilibria ◽  
Alloy Development

scholarly journals A diffusion mobility database for magnesium alloy development

Calphad ◽  
2015 ◽  
Vol 48 ◽  
pp. 123-130 ◽  
Author(s):  
Z.L. Bryan ◽  
P. Alieninov ◽  
I.S. Berglund ◽  
M.V. Manuel
Keyword(s):  
Magnesium Alloy ◽  
Diffusion Mobility ◽  
Alloy Development ◽  
Mobility Database

Influence of Processing Route on the Properties of Magnesium Alloys

2008 ◽  
Vol 141-143 ◽  
pp. 43-48 ◽  
Author(s):  
Frank Hagen ◽  
Norbert Hort ◽  
Hajo Dieringa ◽  
Karl Ulrich Kainer
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Processing Route ◽  
Chemical Compositions ◽  
Alloy Development ◽  
Heat Resistant ◽  
Eu Directive ◽  
Property Profile ◽  
The Eu

Magnesium alloys had gained an increasing interest in recent years due to their promising property profile for light weight constructions. They offer drastic advantages in weight reductions in automotive industries compared to steel or even aluminium. Therefore they can be used to decrease the emission of green house gases as requested by the EU directive for the reduction of CO2 emissions and moreover due to their recyclability they also help to fulfill the requirements from the EU directive regarding the end of life of vehicles. But still there are some limitations with regard to strength, mostly at elevated temperatures above 130 °C. To overcome these limitations alloy development as well as process optimization has to be done for further enhancement of the range of magnesium applications. This paper will show and discuss the property profiles of the standard magnesium alloy AZ91D compared to the recently developed, heat resistant magnesium alloy MRI153. The alloys have been processed using normal high pressure die casting (HPDC), New Rheocasting (NRC) and Thixomolding® (TM). As methods of investigation tensile and creep tests have been applied. The creep properties have been determined in the temperature range of 135-150 °C and loads of 50-85 MPa. All these trials have been accompanied by metallographic observations (light optical metallography, SEM) and density measurements to investigate the influence of the processing routes on microstructure and the porosity of the materials. It will be shown that the differences in the property profile of the chosen alloys are dependent on their different chemical compositions as well as on different microstructures that are obtained by the different processing routes. While in the case of AZ91D, TM is showing advantages compared to HPDC for room temperature applications, the NRC in combination with the heat resistant alloy leads to an improvement of creep rates by two orders of magnitudes.

Emerging Hot Topics and Research Questions in Wrought Magnesium Alloy Development

JOM ◽  
2020 ◽  
Vol 72 (7) ◽  
pp. 2561-2567 ◽  
Author(s):  
Maria-Teresa Pérez-Prado ◽  
Jan Bohlen ◽  
Sangbong Yi ◽  
Dietmar Letzig ◽  
Talal Al-Samman ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Alloy Development ◽  
Wrought Magnesium Alloy ◽  
Research Questions

scholarly journals Magnesium Alloy Development using Phase Equilibria Computation and Microstructure Validation

2012 ◽  
pp. 3-3
Author(s):  
A. A. Luo ◽  
R. K. Mishra ◽  
B. R. Powell ◽  
A. K. Sachdev
Keyword(s):  
Magnesium Alloy ◽  
Phase Equilibria ◽  
Alloy Development
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