R-HPDC of Magnesium Alloys

2012 ◽  
Vol 192-193 ◽  
pp. 225-230 ◽  
Author(s):  
Ulyate Andries Curle ◽  
Jeremias D. Wilkins ◽  
Gonasagren Govender
Keyword(s):  
High Pressure ◽  
Magnesium Alloys ◽  
Aluminium Alloys ◽  
Die Casting ◽  
Intermetallic Phase ◽  
Mg17al12 Phase ◽  
Liquid Segregation ◽  
Surface Liquid ◽  
Pressure Die Casting ◽  
Cast Microstructure

Flexibility of the Council for Scientific and Industrial Research’s Rheocasting System (CSIR-RCS) and its rheo-high pressure die casting (R-HPDC) technology is again demonstrated, as with aluminium alloys, by processing and shape casting of three different magnesium alloys (AM50A, AM60B, AZ91D) in a first attempt. All as-cast microstructures are characterised more by rosette shaped globules of the primary-(Mg) phase together with Mg17Al12 as evidence of non-equilibrium cooling rates. Surface liquid segregation is observed in the as-cast microstructure for all three alloys. Minor alloy additions of Mn, in composition specifications, results in the formation of Al8Mn5 intermetallic phase particles dispersed throughout the microstructure. All alloys were homogenised at 415 °C for 16 hours for the T4 condition. The Mg17Al12 phase dissolves with homogenisation while the Al8Mn5 intermetallic phase does not dissolve. The resulting tensile properties of all three alloys in the as-cast and T4 conditions are reported.

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.

scholarly journals Ejection Performance of Coated Core Pins Intended for Application on High Pressure Die Casting Tools for Aluminium Alloys Processing

2017 ◽  
Vol 39 (3) ◽  
pp. 334-339 ◽  
Author(s):  
P. Terek ◽  
L. Kovačević ◽  
A. Miletić ◽  
D. Kukuruzović ◽  
B. Škorić ◽  
...  
Keyword(s):  
High Pressure ◽  
Aluminium Alloys ◽  
Die Casting ◽  
High Pressure Die Casting ◽  
Pressure Die Casting

Grain Refiner Development for Al Containing Mg Alloys

2013 ◽  
Vol 765 ◽  
pp. 145-149 ◽  
Author(s):  
Leandro Bolzoni ◽  
Magdalena Nowak ◽  
Feng Yan ◽  
N. Hari Babu
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Magnesium Alloys ◽  
Microstructural Evolution ◽  
Die Casting ◽  
Grain Structure ◽  
Grain Refiner ◽  
Am50 Alloy ◽  
Pressure Die Casting ◽  
Copper Mould

We have found a chemical compound which can refine the grain structure of both commercially used Al-free and Al-containing magnesium alloys. In this work, the addition of novel grain refiner (NGR) on microstructural evolution of two magnesium alloys (AZ91D and AM50) solidified under various cooling rates is presented. A wedge-shaped copper mould was used to achieve continuous variation in cooling rate for both alloys. The influence of addition of the grain refiner for AM50 alloy is investigated for high pressure die casting (HPDC) process. A series of tensile samples were produced to inspect microstructural and mechanical properties. The observed improvement in elongation for grain refiner added samples is correlated with the grain refinement in early solidified crystals that are commonly observed in HPDC products.

Development of a Magnesium Alloy Rotor with a Pin-Point Gate Mold

2010 ◽  
Vol 654-656 ◽  
pp. 1460-1463
Author(s):  
Young Cheol Lee ◽  
Hyung Ho Jo ◽  
In Deok Park
Keyword(s):  
High Pressure ◽  
Magnesium Alloys ◽  
High Efficiency ◽  
Die Casting ◽  
Casting Process ◽  
Good Alternative ◽  
High Pressure Die Casting ◽  
Steel Sheets ◽  
Die Casting Process ◽  
Pressure Die Casting

The rotor is a key determinant of the performance of a compressor and many attempts have been made to improve the efficiency of compressors by optimising rotor design. Rotors are usually made of several layers of steel sheets with thin cavities through the steel sheets, and aluminium alloys are used to fill the cavities by high pressure die casting process, and so bind the steel sheets together. Because of their high fluidity and good damping ability, magnesium alloys can be a good alternative for a high efficiency rotor. In this study, magnesium alloys were used for manufacturing rotors by high pressure die casting process using pin-point gate mold. By adopting a pin-point gate system, additional machining was eliminated and casting defects were reduced due to good castability of magnesium alloys.

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.

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