scholarly journals Microstructure and Compression Creep Strength of the Newly Developed Magnesium Alloy DieMag422

2014 ◽  
Vol 1019 ◽  
pp. 177-183
Author(s):  
Hajo Dieringa ◽  
Norbert Hort ◽  
Karl Ulrich Kainer
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Creep Strength ◽  
Creep Resistance ◽  
Die Casting ◽  
High Temperature Strength ◽  
Alloying Element ◽  
Compression Creep ◽  
Additional Alloy ◽  
Pressure Die Casting

<p class="TTPAbstract">Magnesium alloys have been finding increasingly more types of application in the automotive and aerospace industries for over twenty years. Despite the fact conventional magnesium alloys have limited high-temperature strength and creep resistance, especially when they contain aluminium as an alloying element. Aluminium is necessary to improve the castability when high-pressure die casting is the favoured process. Applications with higher operating temperatures require additional alloy elements, which form precipitates with the aluminium during solidification and therefore prevent the formation of Mg17Al12, which is responsible for the low creep resistance of magnesium alloys that contain aluminium. The precipitates formed may also strengthen grain boundaries and so improve the creep strength. Barium and calcium were investigated as elements in a magnesium alloy containing aluminium (DieMag422: 4 wt.-% Al, 2 wt.-% Ba, 2 wt.-% Ca). The compression creep strength was compared at 240°C for stresses between 60 and 120 MPa with two commercial creep-resistant magnesium alloys, AE42 and MRI230D. The stress exponents were calculated from the stress dependence of the minimum creep rate. The concept of a threshold stress was applied and true stress exponents ntclose to 5 were found. The new alloy DieMag422 exhibits improved creep strength compared to both commercial alloys and also has proven it is die castable.</p>

scholarly journals Mg-Al-RE Magnesium Alloys for High-Pressure Die-Casting

2014 ◽  
Vol 14 (2) ◽  
pp. 49-52 ◽  
Author(s):  
K.N. Braszczyńska-Malik
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Magnesium Alloy ◽  
Intermetallic Compound ◽  
Rare Earth Elements ◽  
Magnesium Alloys ◽  
Die Casting ◽  
High Pressure Die Casting ◽  
Cold Chamber ◽  
Pressure Die Casting

Abstract Experimental Mg-Al-RE type magnesium alloys for high-pressure die-casting are presented. Alloys based on the commercial AM50 magnesium alloy with 1, 3 and 5 mass % of rare earth elements were fabricated in a foundry and cast in cold chamber die-casting machines. The obtained experimental casts have good quality surfaces and microstructure consisting of an α(Mg)-phase, Al11RE3, Al10RE2Mn7 intermetallic compound and small amount of α+γ eutectic and Al2RE phases.

Development of Heat-Resistance and Creep-Resistance Magnesium Alloy of Die-Casting Mg-4Al-4La and/or Ce

2010 ◽  
Vol 654-656 ◽  
pp. 687-690
Author(s):  
Jian Meng ◽  
Jing Huai Zhang ◽  
De Ping Zhang ◽  
Zheng Tian ◽  
Wei Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Heat Resistance ◽  
Tensile Properties ◽  
Creep Resistance ◽  
Room Temperature ◽  
Die Casting ◽  
Compression Creep ◽  
Microstructure And Mechanical Properties

Several Mg-4Al-4La/Ce alloys were developed and their microstructure and mechanical properties were evaluated. The phase compositions of Mg-4Al-4La alloy consist of α-Mg and Al11La3 phases. While two binary Al-RE phases, Al11RE3 and Al2RE (RE=Ce/La), are formed in Mg-4Al-4Ce/La alloy, and Al11Ce3 and Al2Ce are formed in Mg-4Al-4Ce alloy. The optimal tensile properties are obtained in Mg-4Al-4Ce/La alloy, in which the UTS, YS and δ are 250, 149.2 MPa and 12.24% at room temperature, and 157.8, 116 MPa and 27% at 150oC, and 99.1, 118.2 MPa and 23.2% at 250oC, respectively. The mechanics properties of Mg-4Al-4Ce/La alloy are nearly same with commercial AE44. The compression creep is lower than that AJ62 alloy.

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.

Development of 2-Cavity Die Casting Process for AM50 Mg Steering Column Lock Housing Module

2006 ◽  
Vol 510-511 ◽  
pp. 334-337
Author(s):  
Shae K. Kim
Keyword(s):  
Magnesium Alloy ◽  
Aluminum Alloys ◽  
Magnesium Alloys ◽  
Weight Reduction ◽  
Die Casting ◽  
Casting Process ◽  
Research Strategy ◽  
Good Choice ◽  
Weight Basis ◽  
Die Casting Process

It is obvious that automotive industry worldwide is predicting significant growth in the use of magnesium alloys for weight reduction to decrease fuel consumption and emission. About a half decade ago, the price of magnesium alloys was more than twice that of aluminum alloys on a weight basis. Currently, magnesium alloys cost about one and a half times that of aluminum alloys on a weight basis, and thus the price of magnesium alloys is the same as or lower than that of aluminum alloys on a per volume basis. However, in considering the performance of magnesium components (not their specific mechanical properties) and recycling aspect of magnesium alloys, it is required to realize niche applications of magnesium alloys, which meet the cost requirement on performance basis and/or offer more than weight reduction. There are many other factors that make magnesium a good choice: component consolidation, improved safety for driver and passengers, and improved noise vibration and harshness (NVH), to name a few. As one of these efforts to adopt magnesium alloys in automotive component, this paper describes the research strategy of cold chamber type 2-cavity die casting of AM50 magnesium alloy for developing the steering column lock housing module with emphasis on cost driving factors and necessities for cost reduction, explaining why AM50 magnesium alloy is chosen with design and die casting process optimization.

Newly Developed Heat Resistant Magnesium Alloy by Thixomolding®

2005 ◽  
Vol 488-489 ◽  
pp. 287-290 ◽  
Author(s):  
Tadayoshi Tsukeda ◽  
Ken Saito ◽  
Mayumi Suzuki ◽  
Junichi Koike ◽  
Kouichi Maruyama
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Die Casting ◽  
The Other ◽  
Heat Resistant ◽  
Higher Temperature ◽  
Better Than

We compared the newly developed heat resistant magnesium alloy with conventional ones by Thixomolding® and aluminum alloy by die casting. Tensile properties at elevated temperatures of AXEJ6310 were equal to those of ADC12. In particular, elongation tendency of AXEJ6310 at higher temperature was better than those of the other alloys. Creep resistance of AXEJ6310 was larger than that of AE42 by almost 3 orders and smaller than that of ADC12 by almost 2 orders of magnitude. Fatigue limits at room temperature and 423K of AXEJ6310 was superior among conventional magnesium alloys.

Magnesium Alloy AZ31 - Short Carbon Fiber Composite Obtained by Pressure Die Casting

2015 ◽  
Vol 229 ◽  
pp. 115-122 ◽  
Author(s):  
Anita Olszówka-Myalska ◽  
Jerzy Myalski
Keyword(s):  
Magnesium Alloy ◽  
Carbon Fibers ◽  
Fiber Composite ◽  
Die Casting ◽  
Az31 Alloy ◽  
Chamber Pressure ◽  
Alloy Az31 ◽  
Magnesium Alloy Az31 ◽  
Pressure Die Casting ◽  
Short Carbon

The application of short carbon fibers in magnesium alloy AZ31 matrix composite fabrication by cold chamber pressure die casting was presented. A technological procedure of small-sized and complex-shaped composite casts manufacturing was shown. The microstructure of the composite was characterized as well as its mechanical properties, friction coefficient and wear resistance. The application of mechanical stirring of melted AZ31 alloy with short fibers and then AZ31-Cf suspension pressure die casting ensured obtaining casts with the reinforcing phase correctly distributed and well bonded with the matrix. Comparision of the AZ31-Cf composite with the AZ31 alloy properties, cast in the same conditions, revealed a considerable increase in bending strength and hardness, and some improvement of ductility and sliding friction parameters as a result of short carbon fibers application.

Microstructure and Creep Properties of AJ62 and AE44 Die-Casting Magnesium Alloys

2010 ◽  
Vol 638-642 ◽  
pp. 1546-1551 ◽  
Author(s):  
Andrzej Kiełbus ◽  
Tomasz Rzychoń
Keyword(s):  
Magnesium Alloys ◽  
Creep Resistance ◽  
Cell Structure ◽  
Creep Behaviour ◽  
Die Casting ◽  
Tensile Creep ◽  
Creep Properties ◽  
Die Cast ◽  
Subgrain Formation ◽  
Good Creep Resistance

Microstructure and tensile creep behaviour of the die-cast AE44 and AJ62 magnesium alloys has been studied at temperatures between 175°C and 200°C and at stresses in the range from 60 to 75 MPa. At the 175°C the AJ62 and AE44 alloys exhibit good creep resistance after 120h creep deformation. At 200°C the AE44 alloy shows still good creep resistance, whereas in the case of AJ62 alloy the rapid decreasing of creep resistance has been observed. TEM observations reveal dislocations cell structure in AE44 alloy after creep test. In AJ62 alloy subgrain formation and decreasing the dislocation density have been observed.

Low-pressure die casting of magnesium alloy AM50: Response to process parameters

2008 ◽  
Vol 205 (1-3) ◽  
pp. 224-234 ◽  
Author(s):  
Penghuai Fu ◽  
Alan A. Luo ◽  
Haiyan Jiang ◽  
Liming Peng ◽  
Yandong Yu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Process Parameters ◽  
Die Casting ◽  
Low Pressure ◽  
Low Pressure Die Casting ◽  
Alloy Am50 ◽  
Pressure Die Casting
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