Alloy AL7
Designation
| Name |
The value |
| Designation GOST Cyrillic |
АЛ7 |
| Designation GOST Latin |
AL7 |
| Transliteration |
AL7 |
| The chemical elements |
- |
Description
Alloy AL7 used: for the manufacture of shaped castings sredneshirotnykh parts, small in size; of casting parts, metallurgical engineering (parts of small size, bearing high static and shock loads).
Note
Aluminum foundry alloy system Al-Cu. Alloy AL7 in the hardened mortar type, and also at the expense of dispersed precipitates phase CuAl2. AL7 alloy has a high shrinkage (1.4 percent), prone to hot cracks and is therefore not recommended for casting in a metal mold.
Advantages: Satisfactory casting properties and good machinability.
Disadvantages: Low casting properties inhibit its use for complex and large workpieces. You should not use the alloy at temperatures above 200 °C.
Standards
| Name |
Code |
Standards |
| Thermal and thermochemical treatment of metals |
В04 |
OST 1 90088-80 |
| Castings from non-ferrous metals and alloys |
В84 |
OST 24.916.01-71 |
Chemical composition
| Standard |
Mn |
Fe |
Cu |
Al |
Ti |
Zn |
Sn |
Mg |
| OST 24.916.01-71 |
≤0.1 |
≤1 |
4-5 |
The rest |
≤0.2 |
≤0.2 |
≤0.01 |
≤0.03 |
Al is the base.
According to OST 24.916.01-71, the iron content is indicated for sand casting, for melted models, die casting and die casting. The amount of impurities to be accounted for should be for sand casting, for melted models, die casting, die casting ≤ 2.20%.
Mechanical characteristics
| σB, MPa |
d |
Brinell hardness number, MPa |
| Casting. Mode T4: Quenching in water from 530-540 °C (2-6 h exposure) |
| ≥196 |
≥6 |
≥60 |
| ≥206 |
≥6 |
≥60 |
Description mechanical marks
| Name |
Description |
| σB |
Limit short-term strength |
| d |
Elongation after rupture |
Physical characteristics
| Temperature |
r, кг/м3 |
l, Вт/(м · °С) |
| 20 |
2800 |
1386 |
A description of the physical symbols
| Name |
Description |
| l |
Coefficient of thermal conductivity |
| С |
Specific heat |
