Alloy ML5-2
Designation
| Name |
The value |
| Designation GOST Cyrillic |
МЛ5-2 |
| Designation GOST Latin |
ML5-2 |
| Transliteration |
ML5-2 |
| The chemical elements |
CuЛ5-2 |
Description
Alloy ML5−2 is used: for the manufacture by sand casting, gravity die casting, pressure loaded parts of complex configuration, designed for operation in atmospheric conditions, including in areas with warm humid climate according to GOST 16350 for up to 5 years; parts of aircraft (parts management, parts of the wings, farm gear, buildings machines and devices) with maximum working temperature up to +150 °C (long-term), up to +250 °C (short-term).
Note
Alloy system Mg-Al-Zn.
Alloy ML5−2 has the best casting, mechanical and technological properties than alloy ML5.
Aluminum and zinc increase the mechanical properties of the alloy (and the effect of aluminum effect is stronger than zinc) and manganese improves corrosion resistance. To reduce oxidation, the alloy contains beryllium.
Standards
| Name |
Code |
Standards |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
OST 3-4132-78 |
| Castings from non-ferrous metals and alloys |
В84 |
OST 3-4227-79 |
Chemical composition
| Standard |
Mn |
Si |
Ni |
Fe |
Cu |
Al |
Zn |
Zr |
Mg |
Be |
| OST 3-4132-78 |
0.15-0.5 |
≤0.25 |
≤0.01 |
≤0.06 |
≤0.1 |
7.5-9 |
0.2-0.8 |
≤0.002 |
The rest |
0.0003-0.001 |
Mg is the basis.
According to OST 3-4132-78 the sum of REM should be in the range of 0.030-0.30%, the sum of impurities being determined is 0.50%. The sum of REM means elements that are part of a cerium mischmetal containing at least 45% cerium. For parts designed to work in areas with a warm, humid climate, as well as for long-term storage and use, the impurity content should not exceed: silicon ≤ 0.15%, iron ≤ 0.020%, copper ≤ 0.040%, nickel ≤ 0.0050% .
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
| The castings as delivered to EAST 3-4132-78 |
|
- |
≥150 |
≥2 |
|
- |
≥150 |
≥2 |
|
≥85 |
≥230 |
≥5 |
|
- |
≥230 |
≥2 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
| 20 |
412 |
1810 |
789 |
134 |
- |
10467 |
| 100 |
- |
- |
- |
- |
268 |
- |
| 200 |
- |
- |
- |
- |
281 |
- |
| 300 |
- |
- |
- |
- |
2870 |
- |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Features of heat treatment |
The alloy can strengthen its positions heat treatment - quenching and aging. |
| Corrosion resistance |
The alloy increased corrosion resistance compared to alloy ML5. Parts should be corrosion protection by applying an oxide coating according to GOST 9.025 and coatings for OST 3-1928. 3-1460. |
| Casting |
The alloy has a broader crystallization range than alloys based on aluminum, therefore has a low castability. Due to the large interval of crystallization of the alloy is prone to hot cracks. |
