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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.

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