Alloy МЛ7-1
Designation
| Name |
The value |
| Designation GOST Cyrillic |
МЛ7-1 |
| Designation GOST Latin |
ML7-1 |
| Transliteration |
ML7-1 |
| The chemical elements |
CuЛ7-1 |
Description
Alloy МЛ7−1 is used: for manufacturing by sand casting body castings for aerospace parts (pump bodies, parts, oil parts, engines) continuously operating in the temperature range from 150 °C to 200 °C.
Note
Alloys, medium strength, has a high resistance compared to the properties of alloys of the system Mg-Al-Zn.
Standards
| Name |
Code |
Standards |
| Thermal and thermochemical treatment of metals |
В04 |
OST 1 90121-90 |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
OST 1 90168-75 |
| Castings from non-ferrous metals and alloys |
В84 |
OST 1 90248-77 |
Chemical composition
| Standard |
Mn |
Si |
Fe |
Cu |
Zn |
Ca |
Mg |
| OST 1 90168-75 |
0.3-0.6 |
≤0.25 |
≤0.1 |
≤0.1 |
5-6.5 |
0.2-0.5 |
The rest |
Mg is the basis.
According to OST 1 90168-75 the chemical composition is given for the alloy grade ML7-1. The sum of detectable impurities in the alloy is not more than 0.45%.
Mechanical characteristics
| Section, mm |
σB, MPa |
d |
| Separately cast samples according to OST 1 90168-75 |
|
≥160 |
≥4 |
|
≥160 |
≥4 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
Technological properties
| Name |
The value |
| Weldability |
Alloy welded satisfactorily TIG and oxygen - acetylene welding. |
| Features of heat treatment |
According to OST 1 90121-90 casting in the ground (sand casting) for reducing the internal stresses of the recommended heat treatment regime T2 - Annealing at 325±5 °With (extract 3-5 h), air cooling. Alloy heat treatment is not hardened. |
| Corrosion resistance |
The alloy possesses satisfactory corrosion resistance. For corrosion protection details oxidenot and applied coatings. |
| Foundry properties |
Castability of the alloy Мл7-1 is satisfactory, however, due to the presence of calcium shows a tendency to formation of hot cracks in the casting. |
| Phase composition |
Phase composition of the alloy Мл7-1: a solid solution of aluminum and zinc to magnesium, the connection Mg4Al3 and Аl2Са and particles of elemental manganese. This compound with solid solution of magnesium in 7.6% of Sa forms a eutectic, melting at 616° C. |
