Effect of Sn Content on Heat Resistance of Mg-3%Al-1%Si Alloy for Casting

2018 ◽  
Vol 941 ◽  
pp. 1071-1076
Author(s):  
Seiji Saikawa ◽  
Manabu Mizutani ◽  
Nozomu Kawabe
Keyword(s):  
Magnesium Alloys ◽  
Optical Microscope ◽  
Permanent Mold ◽  
Power Train ◽  
Suitable Material ◽  
Specific Strength ◽  
Heat Resistant ◽  
High Specific Strength ◽  
Mold Casting ◽  
Mobile Industry

Magnesium alloys have the characteristic with high specific strength and lightweight property, it is widely used for auto mobile industry. Heat-resistant magnesium alloy is focused as a suitable material for weight reduction of the engine and power train parts in automotive field. In this study, microstructure and heat-resistant property in Mg-3mass%Al-1mass%Si (Mg-3%Al-1%Si) alloy with containing large amount of Sn (tin) were investigated. The alloys produced by permanent mold casting were investigated by optical microscope (OM), scanning electron microscopy (SEM) and measuring of bolt load retention at 423K. The heat-resistant property of Mg-3mass % Al-1mass % Si alloy with containing 6-13masss%Sn was higher compared with Sn free alloy and conventional Magnesium alloys (e.g. AZ91 and AM60 alloys).

scholarly journals Magnesium Permanent Mold Castings Optimization

2011 ◽  
Vol 690 ◽  
pp. 65-68 ◽  
Author(s):  
Fady Refaat Elsayed ◽  
Norbert Hort ◽  
Mario Alberto Salgado Ordorica ◽  
Karl Ulrich Kainer
Keyword(s):  
Magnesium Alloys ◽  
Casting Process ◽  
Mold Temperature ◽  
Holding Time ◽  
Permanent Mold ◽  
Melt Temperature ◽  
Cast Part ◽  
Mold Casting ◽  
Permanent Mold Castings ◽  
Inhomogeneous Properties

Permanent mold casting is a well-established route for casting large magnesium alloys components. Casting parameters like superheat, mold temperature, and holding time can often result in inhomogeneous properties, porosity, and segregation problems in the cast part. In order to optimize the casting process, control of the casting parameters including mold temperatures and holding times is essential to promote directional solidification, and ensure defect free homogenous structure. Binary Mg-9wt.%Al and Mg-10wt.%Gd alloys were used to investigate the effect of casting parameters such as melt temperature and holding time on the part macro and microstructure.

Study of Grain Refinement and SiC Nanoparticle Reinforced Magnesium Alloys

2005 ◽  
Vol 488-489 ◽  
pp. 889-892 ◽  
Author(s):  
Zhao Hui Wang ◽  
Yong Lin Kang ◽  
Wenchao Dong ◽  
Hongjin Zhao ◽  
Jin Wei Liu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Grain Refinement ◽  
Magnesium Alloys ◽  
Sic Nanoparticles ◽  
Specific Strength ◽  
High Specific Strength ◽  
Refinement Process ◽  
Reinforced Process ◽  
Strength And Ductility

Magnesium alloys offer advantages of low density, high specific strength, machinability and availability. So it has been used more and more in many fields, such as automobile, communication etc. In this paper, grain refinement process and SiC nanoparticles reinforcement process are investigated for the purposes of increasing ultimate tensile strengthen and ductility of AM60B magnesium alloys. We find that after grain refinement process the ultimate tensile strength of AM60B alloys with permanent casting increase to 241MPa, which is about 27MPa higher than that of original alloys, and the elongation of it increases up to 20.1%, which is about 8.7% higher than that of original alloys. We added SiC nanoparticle into AM60B alloys in liquid state and found it could increase strength and ductility of alloys. By SiC nanoparticle reinforced process the ultimate tensile strength of magnesium alloys can increase up to 255MPa with the elongation of 19%.

A Brief Review about Surface Treatment of Magnesium Alloys

2012 ◽  
Vol 724 ◽  
pp. 307-310 ◽  
Author(s):  
Yu Bai ◽  
Fang Li Yu ◽  
Jun Du ◽  
Wen Xian Wang ◽  
Ze Qin Cui ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Protective Coatings ◽  
Corrosion And Wear ◽  
New Materials ◽  
Paper Briefly ◽  
Effective Protection ◽  
Widespread Application ◽  
Specific Strength ◽  
Aerospace Applications ◽  
High Specific Strength

Due to the low density and high specific strength, magnesium and its alloys have been extensively used in the automobile and aerospace applications, where the weight reduction is critical. However, they are highly prone to corrosion, which has greatly limited their application in the automotive and aerospace industries. This paper briefly reviews the technologies for improving the corrosion and wear resistance of magnesium alloys and finds that the widespread application of magnesium alloys is still limited by the lack of proper protective coatings. Therefore, there is still a need to explore new materials and methods for the effective protection of magnesium and its alloys.

Methods for Prevention of Ignition during Machining of Magnesium Alloys

2010 ◽  
Vol 447-448 ◽  
pp. 150-154 ◽  
Author(s):  
Jun Zhan Hou ◽  
Wei Zhou ◽  
Ning Zhao
Keyword(s):  
Magnesium Alloys ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Specific Strength ◽  
Microelectronic Devices ◽  
High Specific Strength ◽  
Cut Depth ◽  
Cutting Speeds

Magnesium alloys have been increasingly used in automotive and aerospace components and in portable microelectronic devices due to their “ultralightness” and high specific strength. Machining is an important method used to process magnesium alloys. The advantages of machining over other processing methods such as die casting include reduction in power consumption and excellent surface finish. However, the ignition of chips presents a dangerous problem during machining. This problem has attracted considerable research interests. Though coolants can be used effectively to prevent ignition, the pollution of environment and reclamation of chips can not be resolved easily. Therefore, one better approach is to control the machining parameters for minimizing ignition hazard of magnesium alloy chips during dry machining. A systematic study was conducted for a few different magnesium alloys (including AM50A and AZ91D) to understand effect of cutting parameters (cutting speed, feedrate and depth of cut) on ignition of chips during face milling. It is interesting to find that for any fixed cut depth ignition in the forms of sparks, flares or ring of fire occurs only in the moderate cutting speeds and feedrates and can thus be easily prevented by adopting either higher or lower cutting speeds or feedrates. Chips produced in different machining conditions were collected and their morphology was analyzed to understand mechanisms of ignition.

scholarly journals Development of a High Strength Magnesium Alloy for Wire Arc Additive Manufacturing

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 778
Author(s):  
Stefan Gneiger ◽  
Johannes A. Österreicher ◽  
Aurel R. Arnoldt ◽  
Alois Birgmann ◽  
Martin Fehlbier
Keyword(s):  
Additive Manufacturing ◽  
Magnesium Alloys ◽  
High Strength ◽  
Manufacturing Processes ◽  
Rare Earth Alloy ◽  
Specific Strength ◽  
High Specific Strength ◽  
Material Utilization ◽  
Wire Arc Additive Manufacturing ◽  
Specific Part

Due to their high specific strength, magnesium alloys are promising materials for further lightweighting in mobility applications. In contrast to casting and forming processes, additive manufacturing methods allow high degrees of geometrical freedom and can generate significant weight reductions due to load-specific part design. In wire arc additive manufacturing processes, large parts can be produced with high material utilization. Process-inherent high melt temperatures and solidification rates allow for the use of magnesium alloys which are otherwise complicated to process; this enables the use of unconventional alloying systems. Here, we report the development of a Mg-Al-Zn-Ca-rare earth alloy for wire arc additive manufacturing (WAAM). Compared to parts made of commercially available filler wire, the newly developed alloy achieves a higher strength (approx. +9 MPa yield strength, +25 MPa ultimate tensile strength) in WAAM.

Heat Resistant Magnesium Alloys for Power-Train Applications

2001 ◽  
Author(s):  
Pierre Labelle ◽  
Mihriban Pekguleryuz ◽  
Don Argo ◽  
Mike Dierks ◽  
Todd Sparks ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Power Train ◽  
Heat Resistant

Formation of Fold Defects in Permanent Mold Cast AE42 Magnesium Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 1591-1595
Author(s):  
Lukas Bichler ◽  
Comondore Ravindran
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Microstructural Analysis ◽  
Surface Flow ◽  
Rapidly Solidify ◽  
Permanent Mold ◽  
Process Formation ◽  
Mold Casting ◽  
Macro Scale ◽  
Alloy Castings

Application of magnesium alloys potentially plays a key role in weight reduction of automotive and aerospace components. Majority of magnesium components are manufactured via the high-pressure die-casting (HPDC) or permanent-mold casting (PMC) processes. In general, castability of magnesium alloys is comparable to aluminum alloys. However, unique defects related to the high susceptibility of magnesium to rapidly solidify, dissolve hydrogen or form oxides potentially contribute to material failure. In this research, AE42 magnesium alloy castings were manufactured via the PMC process. Formation of fold defects in regions of high melt turbulence was observed on the macro-scale as visible surface flow-lines. Microstructural analysis revealed that folds in the AE42 alloy we related to the rapid solidification and short alloy freezing range. Further, segregation of Al2RE intermetallics at the metal front hindered proper fusion of merging metal fronts.

Finite Element Analysis of the Forging Process of Magnesium Wheels

2007 ◽  
Vol 345-346 ◽  
pp. 1079-1084
Author(s):  
Zi Hui Xia ◽  
Feng Ju
Keyword(s):  
Finite Element ◽  
Magnesium Alloys ◽  
Working Condition ◽  
Forming Process ◽  
Element Analysis ◽  
Forging Process ◽  
Specific Strength ◽  
High Specific Strength ◽  
Final Deformation ◽  
Critical Consideration

The high specific strength of the magnesium alloy makes it a valuable choice for automotive, aerospace and sporting industries, where the weight reduction is a critical consideration in design. However, wrought magnesium alloys offer a poor formability at room temperature and a hot working condition is required for the forming process. This paper studies the application of finite element methods for the simulation of the forging of magnesium alloys. Numerical analysis of the forging process of an automotive magnesium wheel is conducted based on the tested flow curve of AZ80. The effect of friction on the final deformation of the upsetting of magnesium billets is also discussed.

Influence of Misch Metal Addition and Deformation Processes on Microstructure and Mechanical Properties in AZ61 Alloy

2007 ◽  
Vol 539-543 ◽  
pp. 1707-1712 ◽  
Author(s):  
Suk Bong Kang ◽  
Hyoung Wook Kim ◽  
Sang Su Jeong ◽  
Jae Woon Kim
Keyword(s):  
Magnesium Alloys ◽  
Metallic Materials ◽  
Specific Strength ◽  
High Specific Strength ◽  
Misch Metal ◽  
Deformation Processes ◽  
Structural Parts ◽  
Strength And Stiffness ◽  
Metal Addition ◽  
Hexagonal Closed Packed

Magnesium alloys have been known as the best lightweight metallic materials for various applications of electronic equipments and automobile parts due to high specific strength and stiffness. The needs for wrought magnesium alloys have been increased for the application to structural parts in the form of sheets and bars. However, magnesium has a hexagonal closed-packed (HCP) crystal structure with a limited number of operative slip systems at room temperature, and its formability is restricted to mild deformation. The improvement of the formability of magnesium sheets for real applications is important. In order to increase formability of magnesium sheets at elevated temperature, one promising way is a grain refinement.

Fractography and Structural Analysis of WE43 and Elektron 21 Magnesium Alloys with Unmodified and Modified Grain Size

2012 ◽  
Vol 191 ◽  
pp. 123-130
Author(s):  
Stanisław Roskosz ◽  
Bartłomiej Dybowski ◽  
Jan Cwajna
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Smelting Process ◽  
Steering Wheel ◽  
Low Density ◽  
Specific Strength ◽  
High Specific Strength ◽  
Metallic Inclusions ◽  
Optimal Set ◽  
Very High

Magnesium alloys, thanks to their low density, are characterized by very high specific strength and specific stiffness. Due to acceptable mechanical properties, these alloys are widely used in automotive and aerospace industries for the elements such as: gearbox and engine housings, steering wheel columns or wheels. The main problem of the most common magnesium alloys – such as AZ91 are their weak high temperature properties. This led to development of alloys containing rare earth elements. These alloys achieve their demanded mechanical properties after grain refinement with the zirconium. Because of a big responsibility of the elements made from Mg-RE alloys, it is important to investigate modification impact on properties of the magnesium alloys. The paper presents results of studies properties of the WE43 and Elektron 21 casting magnesium alloys, modified in three different ways – according to Magnesium-Elektron specification, 50% stronger modification and 100% stronger. For the comparison, unmodified alloys were also investigated. Investigations showed, that alloys modified according to MEL specification presents optimal set of structural and mechanical properties. Further increase of amount of modifiers doesn’t let to significant increase of mechanical properties. Fractographic investigations showed many non-metallic inclusions on the fractures surface, which are result of faulty smelting process.

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