Alloy МЛ7-1

  • Alloy ML23
  • Alloy ML9
  • Alloy ML8
  • Alloy ML7-1
  • Alloy ML6
  • Alloy ML5pch
  • Alloy ML5on
  • Alloy ML5-2
  • Alloy ML5-1
  • Alloy ML5
  • Alloy ML4pch
  • Alloy ML4
  • Alloy ML3
  • Alloy ML22
  • Alloy ML21
  • Alloy ML20-1
  • Alloy ML2
  • Alloy ML19 (VML7)
  • Alloy ML18 (VML6)
  • Alloy ML17 (VML5)
  • Alloy ML15
  • Alloy ML12
  • Alloy ML11
  • Alloy ML10

    • Designation

    Name The value
    Designation GOST Cyrillic МЛ7-1
    Designation GOST Latin ML7-1
    Transliteration ML7-1
    By 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, and their alloys В51 OST 1 90168-75
    Castings, 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 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 properties

    Section, mm σU, MPa d
    Separately cast samples according to OST 1 90168-75
    ≥160 ≥4
    ≥160 ≥4

    Description mechanical marks

    Name Description
    σU 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.
    Castability 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.