aluminum alloys, thermally hardening

thermally neuprochnyaemye aluminum alloys They include the various grades of aluminum and other alloys, у которых повышение прочностных свойств достигается за счет:

  • alloying and solid solution
  • деформационного упрочнения (hardening, nagartovki) от отожженного состояния.

alloying elements

Главные легирующие элементы этих сплавов включают:

  • magnesium,,
  • manganese and
  • silicon.

Дополнительные легирующие элементы:

  • chromium,
  • copper,
  • iron and
  • zinc.

Properties thermally alloys neuprochnyaemyh

aluminum alloys, которые не воспримчивы к термической обработке имеют следующие общие свойства:

  • relatively low strength,
  • high plasticity and
  • high corrosion resistance.

К этой группе относятся сплавы:

  • марки алюминия (серия 1ххх);
  • системы алюминий-марганец (сплавы АМцсерия 3ххх);
  • системы алюминий-магний (сплавы АМгсерия 5ххх);
  • some alloys of the 7xxx series and 8xxx.

The main mechanism of hardening of these alloys, if necessary, no heat treatment, а нагартовка (наклеп) путем пластического деформирования.

Технический алюминий (серия 1ххх)

Stamps technical aluminum may contain up 1 % various additional additives or admixtures.

technical aluminum structure is composed of a small volume fraction of iron and / or silicon, which form insoluble particles in an aluminum matrix.

aluminum cold deformation 1100

technical aluminum Hardening occurs substantially only due to strain hardening – нагартовки (наклепа). The maximum level of alloy strength reaches 1100 (AD), which is often considered “standard” technical aluminum. Fully cold-worked aluminum alloy 1100 reaches tensile strength 165 MPa yield strength 150 MPa and a total elongation 5 %. Technical deformed aluminum is used in nearly all areas of industry. Most technical aluminum is on the packaging, in Chemical Engineering, energy and construction.

Сплавы Аl-Mn и Al-Mn-Mg (серия 3ххх)

3xxx series aluminum alloy contains from 0,3 to 1,5 % manganese.

The only binary alloys, aluminum-manganese, which is of industrial interest, It is an alloy 3003 (AMc). This alloy has about 1,2 % manganese, aluminum which increases strength by solid solution hardening and its precipitation hardening particles Al6Mn.

The role of magnesium in the alloys 3xxx

Addition of magnesium to the alloy of aluminum-manganese greatly increases its strength properties due to solid solution strengthening. for instance, alloy 3004 (Д12) имеет прочность около 180 MPa in the annealed condition compared with 110 MPa alloy 3003.

The content of manganese in 3xxx alloys is much lower than its theoretical maximum solubility in aluminum;. The thing is, unavoidable impurity that reduces manganese iron solubility in aluminum;, and the formation of coarse particles Al6Mn may adversely affect the ductility.

Manganese, Unlike other elements, It does not impair the corrosion resistance of aluminum, and even improves it. Therefore 3xxx alloys compared to pure aluminum higher strength and corrosion resistance.

aluminum alloys 3003 and 3004

Both alloys 3003 and 3004 have high corrosion resistance and high strength in combination with high ductility. These alloys are used there, requiring moderate strength and good weldability. They are increasingly being used successfully in those areas, where previously used various brands of aluminum, providing a high strength without loss of corrosion resistance.

In particular, alloy 3004 in large quantities used in the manufacture aluminum cans Beer and soft drinks.

aluminum alloys 3005 and 3105

alloys 3005 (ММ) и 3105 have a good combination of strength, formability and corrosion resistance and is therefore widely used in construction and finishing materials.

Сплавы Al-Mg (серия 5ххх)

5xxx series aluminum alloys contain 0,8 to 5 % magnesium as the principal alloying element. Although magnesium with decreasing temperature and decreases its solubility in aluminum;, Al-Mg alloys do not exhibit substantial age hardening at a magnesium concentration less than 7 %.

Alloys containing magnesium 1 to 6 %

However, the magnesium provides a significant strengthening of the solid solution of aluminum and increases susceptibility to work hardening. for instance, annealed alloy with Al-1Mg 1 % Magnesium has a yield strength 40 Strength MPa 125 MPa. By increasing the magnesium content to 6 % yield strength increases to 160 MPa, and strength – to 310 MPa. Elongation in the range of magnesium content is high and exceeds 25 %.

Al-Mg alloys combine a wide range of strength properties, good formability, good weldability and high corrosion resistance.

Welding of Aluminum Alloys 5xxx

The most valuable quality 5xxx alloys is their behavior when welding high-strength alloys industrial welding processes. Weld strength is annealed state for most alloys exhibit high ductility and. The high strength of these alloys and the high quality of welds that provide them widely used in transport engineering and construction.

Cryogenic 5xxx alloys

Good mechanical properties of the alloys at low temperatures 5xx used to allow different cryogenic techniques.

Other alloys netermouprochnyaemye

Aluminium alloy 8001

Alloy 8001 It contains 1,1 % nickel and 0,6 % iron, and has good corrosion resistance in hot water and at high pressure. Its mechanical properties similar to the properties of the alloy 3003. It is used in the nuclear industry.

Aluminium alloy 8011

Alloy 8011 (Al-0,75Fe-0,7Si) применяют для изготовления пробок для бутылок. It has the properties, which are suitable for large plastic deformations, that occur during deep planting.

aluminum alloys 8081, 8280 and 8009

alloys 8081 (Al-0,75Fe-0,7Si) и 8280 (Al-6,2Sn-1Cu-1,5Si) имеют отличные антифрикционные свойства и их применяют в подшипниках для автомобилей.