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In the case of pure aluminium, the grain size has a minor influence on the strength for metals. In the case of alloys, the influence increases with the alloy content. At 5% Mg, materials with grain sizes of 50 μm achieve uniform elongations of around 0.25, at 250 μm they are around 0.28.
Alloys with small amounts of magnesium (about 5%) exhibit greater strength, greater corrosion resistance, and lower density than pure aluminium. Such alloys are also more workable and easier to weld than pure aluminum. [1] Alloys with high amounts of magnesium (around 50%) are brittle and more susceptible to corrosion than aluminum.
Magnox (alloy), whose name is an abbreviation for "magnesium non-oxidizing", is 99% magnesium and 1% aluminium, and is used in the cladding of fuel rods in magnox nuclear power reactors. Magnesium alloys are referred to by short codes (defined in ASTM B275) which denote approximate chemical compositions by weight.
The content of magnesium is greater than that of silicon, otherwise they belong to the aluminum–silicon–magnesium alloys (AlSiMg). AlMgSi is one of the hardenable aluminum alloys, i.e. those that can become firmer and harder through heat treatment. This curing is largely based on the excretion of magnesium silicide (Mg 2 Si). The AlMgSi ...
In the case of the AlSiCu alloys, higher proportions of copper are also added, which means that the materials can be hardened (see Aluminum-copper alloy). Together with silicon, magnesium forms the Mg 2 Si ( magnesium silicide ) phase, which is the basis of hardenability, similar to aluminum-magnesium-silicon alloys (AlMgSi).
In aluminium alloys containing magnesium, magnesium oxides (MgO), cuboids (MgAl 2 O 4-cuboid) and metallurgical spinel (MgAl 2 O 4-spinel) can form. They result from the reaction between magnesium and oxygen in the melt. More of them will form with time and temperature. Spinel can be highly detrimental because of its big size and high hardness.
5083 aluminium alloy is an aluminium–magnesium alloy with magnesium and traces of manganese and chromium. It is highly resistant to attack by seawater and industrial chemicals. [1] Alloy 5083 retains exceptional strength after welding.
5052 is an aluminium–magnesium alloy, primarily alloyed with magnesium and chromium. 5052 is not a heat treatable aluminum alloy, but can be hardened through cold working. [ 2 ] Chemical properties
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