Alloy ML19 (ВМЛ7)

  • 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 МЛ19
    Designation GOST Latin ML19
    Transliteration ML19
    By chemical elements CuЛ19
    Name The value
    Designation GOST Cyrillic ВМЛ7
    Designation GOST Latin BML7
    Transliteration VML7
    By chemical elements ВCuЛ7

    Description

    Alloy ML19 used: for the manufacture of shaped castings of engine parts and devices, continuously operating at temperatures up to +300 °C briefly up to 400 °C.

    Note

    The industrial heat-resistant magnesium alloy system MD-REE-Zr. For alloying of the alloy of the rare earth metals neodymium use. The alloy contains additives of yttrium, zinc and zirconium.
    Alloy combines sufficiently good mechanical properties at room temperature with high heat resistance, good casting and technological properties, allowing to obtain a dense casting with a uniform mechanical properties in the cross-sections of different thickness.
    The long-term strength for 100 h alloy is superior to alloy ML10 at 250 °C in 1.5 times, and at 300 °C by 2.5 times. The creep strength of the alloy is superior to the most common alloy ML5 at 200 °C for 11 times.

    Standards

    Name Code Standards
    Non-ferrous metals, including rare, and their alloys В51 GOST 2856-79, OST 1 90168-75
    Thermal and thermochemical treatment of metals В04 OST 1 90121-90
    Castings, non-ferrous metals and alloys В84 OST 1 90248-77

    Chemical composition

    Standard Si Ni Fe Cu Al Zn Zr Nd Mg Y Be
    OST 1 90168-75 ≤0.03 ≤0.01 ≤0.01 ≤0.03 ≤0.03 0.1-0.6 0.4-1 1.6-2.3 Rest 1.4-2.2 ≤0.001
    GOST 2856-79 ≤0.03 ≤0.005 ≤0.01 ≤0.03 ≤0.03 0.1-0.6 0.4-1 1.6-2.3 Rest 1.4-2.2 ≤0.001
    Mg is the basis.
    According to GOST 2856-79, the content of other impurities is ≤ 0.14%, the sum of the impurities to be determined is 0.25%.
    According to OST 1 90168-75 the chemical composition is given for the alloy grade ML19 (VML7). Other (not specified) impurities - not more than 0.14%. The sum of all detectable impurities in the alloy is not more than 0.25%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d
    Separately cast samples according to OST 1 90168-75
    ≥120 ≥220 ≥3
    Casting sand casting and gravity die casting according to GOST 2856-79. Mode Kzt61: Homogenization + annealing at air + aging
    ≥120 ≥220 ≥3

    Description mechanical marks

    Name Description
    sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
    σU Limit short-term strength
    d Elongation after rupture

    Physical characteristics

    Temperature Е, HPa r, kg/m3 l, W/(m · °C) С, J/(kg · °C)
    20 43 1790 879 11304

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    r Density
    l Coefficient of thermal conductivity
    С Specific heat

    Technological properties

    Name The value
    Features of heat treatment According to OST 1 90121-90 to improve the mechanical properties (σв, σ0,2) castings in sand and chill casting is used, the heat treatment by mode T6 - Tempering by blowing air with a 535±5 °C (delay of 4-8 h) + Aging at 205±5 °C (extract 8-16 h), air cooling. In this case the plastic properties decrease. A noticeable increase in the values of σв, σ0,2 is achieved in the hardening of the casting by blowing air.