Alloy AL7

Designation

Name The value
Designation GOST Cyrillic АЛ7
Designation GOST Latin AL7
Transliteration AL7
By 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, 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 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 properties

σU, MPa d HB, 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
σU Limit short-term strength
d Elongation after rupture
HB Brinell hardness number

Physical characteristics

Temperature r, kg/m3 l, W/(m · °C)
20 2800 1386

A description of the physical symbols

Name Description
l Coefficient of thermal conductivity
С Specific heat