scholarly journals Infiltration of Cellular Silicon by Molten Magnesium Alloys

2017 ◽  
Vol 19 (10) ◽  
pp. 1700023 ◽  
Author(s):  
Alexander Martin Matz ◽  
Bettina Stefanie Mocker ◽  
Johann Heimann ◽  
Norbert Jost
Keyword(s):  
Magnesium Alloys ◽  
Molten Magnesium

A Development of Virtual Manufacturing System for Magnesium High Pressure Die Casting Processes

Materials ◽  
2003 ◽  
Author(s):  
Weilong Chen
Keyword(s):  
High Pressure ◽  
Magnesium Alloys ◽  
Die Casting ◽  
Virtual Manufacturing ◽  
Mold Design ◽  
High Pressure Die Casting ◽  
Molten Magnesium ◽  
Pressure Die Casting ◽  
Soft And Hardware ◽  
Free Magnesium

In recent years, high-pressure die-casting magnesium components have been gaining currency worldwide because of the excellent properties that magnesium alloys can offer to meet new product requirements. With the increasing application of magnesium parts worldwide, many research and development projects have been carried out to advance HPDC technology. However, truly optimized mold design and production of defect free castings remains a challenge for die casters. For many HPDC magnesium products, especially those specified for porosity-free and high cosmetic requirement, the challenge not only comes form a lack of a deeper understanding of how molten magnesium alloys fill the mold cavity and form defects, but also from improper preliminary part design. This study proposes a virtual prototyping system that integrates several effective soft and hardware tools for both the part and mold-design engineer to evaluate part manufacturability. Also, investigated in this study are the major causes of those defects that are the predominant cause of rejection of thin walled, leak-free magnesium parts requiring highly cosmetic finishes.

Investigation of Protective Cover Gas Mixtures for Prevention of Melt Ignition during Magnesium Alloy Melting

2005 ◽  
Vol 475-479 ◽  
pp. 2543-2546 ◽  
Author(s):  
Won Ha ◽  
Jae-Eon Lee ◽  
Young Jig Kim
Keyword(s):  
Magnesium Alloy ◽  
Mild Steel ◽  
Magnesium Alloys ◽  
Gas Mixtures ◽  
Hfc 134A ◽  
Protective Cover ◽  
Protection Property ◽  
Molten Magnesium

In this study, melt protection property of SF6+synthetic air and HFC-134a+synthetic air cover gas mixtures were investigated for most commonly used magnesium alloys, AZ91D and AM60B. Each alloy was melted in mild steel crucible with different temperature, cover gas concentrations and sealing conditions. HFC-134a+synthetic air cover gas mixtures offered better melt protection property for all variables of temperatures, alloys, cover gas concentrations and sealing conditions. However, crucible (AISI 1020) surface that is exposed to HFC-134a cover gas mixtures was seriously damaged due to the corrosive characteristics of HFC-134a in molten magnesium temperature.

Analysis of Pipe Flow during Transportation of Magnesium Alloy Melt

2005 ◽  
Vol 486-487 ◽  
pp. 233-236
Author(s):  
Hwang Gu Lee ◽  
Dong Jin Kim ◽  
Jeong Whan Han ◽  
Byung Don You ◽  
Ji Young Byun
Keyword(s):  
Magnesium Alloys ◽  
Pipe Flow ◽  
Water Model ◽  
Molten State ◽  
Metal Oxidation ◽  
Interface Area ◽  
Molten Magnesium ◽  
Different Diameters ◽  
Optimized Conditions ◽  
Extreme Care

Magnesium alloys have been well known as active metals. Thus, magnesium alloys in molten state must be handled with extreme care during melting and casting. In this study, water model experiments and numerical analyses were carried out to optimize a pipe flow that can transport magnesium alloys in molten state safely from melting to casting furnace. Especially, during a transportation of molten magnesium alloys, a flow pattern in a pipe becomes important, because the interface between air and melt can be the source of the metal oxidation, and therefore, an air/melt interface area must be minimized. For these purposes, two vessels connected with a long pipe having two elbows with different diameters and radii of the curvature were simulated as melting and casting furnace for magnesium alloys. Optimized conditions with minimized air/melt interface area for the melt transportation were discussed in several pipe configurations.

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.

Effect of Er on Ignition-Proof Property of Mg-Zn Alloys

2011 ◽  
Vol 284-286 ◽  
pp. 1554-1558
Author(s):  
Jian Fen Zhang ◽  
Zhao Hui Wang ◽  
Xu Dong Wang ◽  
Wen Bo Du
Keyword(s):  
Magnesium Alloys ◽  
Oxidation Process ◽  
Ignition Point ◽  
Molten Magnesium ◽  
Zn Alloy ◽  
Zn Alloys

In this paper, the effect of Er element on ignition-proof property of Mg-Zn alloys was studied. XRD, SEM and EDS were used to investigate the ignition-proof performance and the oxidation film of the alloys. The element of Er tended to enrich in the surface of molten magnesium alloys during the oxidation process. And the oxidation film was composed of MgO and Er2O3. With the Er content in Mg-Zn alloy increasing, the content of Er2O3in oxidation film increases and the ignition point of Mg-Zn alloys rise. So Er can improve the ignition-proof properties of Mg-Zn alloys greatly.

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