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Filatov Yu.A.,All Russia Institute Of Light Alloys
Tsvetnye Metally | Year: 2014

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, 1570C and 1545K 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.

Results are presented for a study of non-dendritic solidification of light alloys based on an accomplished scientific discovery. © 2010 Springer Science+Business Media, Inc.

Zakharov V.V.,All Russia Institute Of Light Alloys
Metal Science and Heat Treatment | Year: 2015

C-curves of isothermal decomposition of the solid solution of scandium in aluminum are plotted for binary Al – Sc alloys with different scandium content. It is shown that growth in the scandium content from 0.14 to 0.55% reduces the incubation period by 2 – 3 orders of magnitude and increases the rate of the decomposition by 2 orders of magnitude. The causes of the accelerated decomposition of the solid solution of scandium in aluminum are discussed. © 2015, Springer Science+Business Media New York.

Zakharov V.V.,All Russia Institute Of Light Alloys
Metal Science and Heat Treatment | Year: 2012

Topics of modification of the grain structure and of formation of supersaturated solid solution in crystallization of melts of scandium-alloyed aluminum alloys are considered. The strong modifying property of scandium is a result of the effective inoculating action of Al 3Sc particles and their great number in unit volume of the melt. Scandium is susceptible to formation of supersaturated solid solutions at enhanced crystallization rates, and an additive of zirconium intensifies this susceptibility. © 2012 Springer Science+Business Media, Inc.

Ivanyukhin A.N.,Moscow State Technical University | Frolov V.A.,Moscow State Technical University | Konkevich V.Y.,All Russia Institute Of Light Alloys
Welding International | Year: 2011

An analysis of the macro- and microstructure of the B95 aluminium alloy (Al-Zn-Mg-Cu system) welded joints obtained by arc, electron-beam, and mixing friction welding is carried out. Welded joints' structure and mechanical properties differences are investigated. It is shown that application of the scandium alloyed welding wire allows for preventing autocrack formation at fusion welding. The most durable and qualitative welded joints are obtained at mixing friction welding. © 2011 Taylor & Francis.

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