“All-Russia Institute of Light Alloys” JSC, Moscow, Russia:

Yu. A. Filatov, Chief Researcher, e-mail: info@oaovils.ru

Strength of aluminium alloys of Al – Mg – Sc system is considerably higher than strength of Al – Mg alloys with the same content of Mg, saving their basic advantages, such as: good weldability, high corrosion resistance and absence of necessity in reinforcing heat treatment. There is described the mechanism of hardening of Al – Mg system alloys during their scandium alloying. There are considered the following types of Al – Mg – Sc alloys:
— high-alloy type, containing >4% of Mg (01570, 1570С and 1545К grades);
— low-alloy type, with addition of <4% of Mg (01523, 01515, 01513, 01511 and 01411 grades).

Mechanical properties of sheets and plates, made of high Al – Mg – Sc system alloys, are given together with characteristics of sheets' weldability, and structure and properties of basic metal and welded joints. There is shown the possibility of obtaining of welded joints, which are practically equally strength to annealed basic metal. There are given the examples of possible application of high Al – Mg – Sc alloys both in high-strength hermetical welded constructions (space vehicle frame, fuel tanks, containers for transportation of liquefied natural gas) and in load-bearing welded construction, intended for working in adverse climatic conditions and in distant Far North regions. There is shown the possibility of usage of low Al – Mg – Sc system alloys for production of the following constructions:
– welded constructions with high corrosion and radiation resistance;
– heat-conducting welded constructions with increased strength;
– brazed constructions, obtained by methods of high-temperature vacuum soldering.

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