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Metagran Co. Ltd 12 Zheleznodorozhnaya st.   Podolsk city,   Moscow region   Russia 142100 Tel.: +7 (901) 539-4063 Fax: +7 (495) 466-2958

Advantages of extruded semi-finished materials and forged parts made from granular magnesium alloys:

Over the last few years, the progress of various engineering branches has increased the need for the construction of new, lighter structural materials with a higher strength-to-weight ratio.

High-content aluminium alloys, which are currently being used in the manufacturing of high-exploitation parts, do not meet the increasing needs. A decrease in weight is essential to reducing usage of material, with the increasing usage of parts. Among other light metals alloys, magnesium alloys are particularly attractive because of their light weight, high strength-to-weight ratio and hardness at room temperatures and up.

The use of new materials in parts is a consequence of the development and realisation of new technological processes for obtaining them. The development of progressive methods for producing semi-finished materials – granule metallurgy, which is based on high-speed mould crystallisation – plays a big role in this. Such method of mould granulating has a number of advantages in structure improvement, mechanical properties and corrosion resistance of the alloys.

The active influence of high-speed crystallisation method on their phase structure, allows the obtaining of new materials, which cannot be obtained by traditional methods.

High-speed crystallisation of transition metal alloys allows a much higher dissolubility state than their analogue in solid solution.

The use of high purity metals and alloying components results in an increase in corrosion resistance of the high-speed crystallised alloys, by eliminating the influence of metal admixtures and flux.

Up until now, granules and semi-finished products made of granular magnesium alloys have not reached production capacity anywhere in the world. The reasons for the slow progress in developing methods for the production of magnesium alloy granules include: high level of chemical activity in magnesium and magnesium alloys, the peculiarity of physical-mechanical properties of surface oxide film, as well as difficulties in achieving reliable granule control in the deformation process needed for attaining superior mechanical properties of the material.

Metagran, a research and production company, has developed and realised the production of magnesium alloy granules, including technology for the production of extruded semi-finished materials (bars, tubings, profiles, strips) and forged parts.

An important advantage of the developed magnesium alloy materials and the respective deformation technology lies in the capability of developing thin-walled, large diameter tubings (diameter of up to 300 mm) using the extrusion method, which is not possible with serial production of magnesium tubings.

As a result of isothermal deformation of extruded granular magnesium alloy semi-finished materials, with the additions of rare-earth metal alloys, and in high-mould conditions, forged parts were produced, which have mechanical properties similar to those of the D16T aluminium alloy. The deformation of granular magnesium alloy billets using the method of isothermal forging has allowed the production of parts with a given geometrical size, and which allows further mechanical processing with the maximum proportion of material (up to 0.9).

In addition to the possibility of producing new construction materials, the newly developed method of manufacturing granular magnesium alloy parts allows to significantly increase the physical-mechanical properties of serial magnesium alloys, which is confirmed by the VIAM certificates:

• Granular magnesium material MA2-1gr – No. 1.595.001.90
• Granular magnesium material MA14gr – No. 1.595.002.90.

One of the advantages of Metagran's equipment, is in its ability of obtaining extruded semi-finished parts and products with a chemical composition conforming to the customer's specifications, the ASTM, DIN, etc. standards and international ISO and EN standards.

The welding properties of granular magnesium alloys makes them usable in the production of parts for the mechanical engineering and auto industries, as well as consumer goods, which require light weight and increased mechanical properties.

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