Alloy ML9

  • 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 МЛ9
    Designation GOST Latin ML9
    Transliteration ML9
    By chemical elements CuЛ9

    Description

    Alloy ML9 used: for the manufacture of shaped castings of parts with maximum operating temperature of 250−300 °C for a long time, +350−400 °C — short-term.

    Note

    High-temperature alloy system MD-REE-Zr. For alloying of the alloy of the rare earth metals neodymium use. The alloy contains additives of indium 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.
    Alloy ML9 is also used for parts of engines and instruments, but its heat resistance is lower than that of alloy ML19.

    Standards

    Name Code Standards
    Non-ferrous metals, including rare, and their alloys В51 GOST 2856-79
    Thermal and thermochemical treatment of metals В04 OST 1 90121-90
    Castings, non-ferrous metals and alloys В84 OST 1 90200-75, OST 1 90248-77

    Chemical composition

    Standard Si Ni Fe Cu Al Zn Zr Nd Mg Be In
    GOST 2856-79 ≤0.03 ≤0.005 ≤0.01 ≤0.03 ≤0.02 ≤0.15 0.4-1 1.9-2.6 Rest ≤0.001 0.2-0.8
    Mg is the basis.
    According to GOST 2856-79, the content of other impurities is ≤ 0.10%, the sum of the impurities to be determined is 0.35%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, %
    Casting in sand, shell, investment casting and plaster mold and chill casting GOST 2856-79. T6 mode: Homogenization + annealing at air + aging
    ≥110 ≥230 ≥4
    Casting forming OST 1 90200-75. In the delivery condition specified in the casting method, delivery condition and strength class KP
    ≥118 ≥226 ≥4.5
    ≥108 ≥206 ≥4
    ≥108 ≥191 ≥3.5
    ≥108 ≥177 ≥2.5

    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
    d5 Elongation after rupture

    Physical characteristics

    Temperature Е, HPa r, kg/m3 l, W/(m · °C)
    20 43 1760 1172

    A description of the physical symbols

    Name Description
    Е The normal elasticity modulus
    r Density
    l Coefficient of thermal conductivity
    R UD. the resistivity

    Technological properties

    Name The value
    Features of heat treatment According to OST 1 90121-90 to improve the mechanical properties (σв, σ0,2) casting in the ground, shell molding, gravity die casting, investment casting and plaster mold apply heat treatment by mode T6 - Tempering by blowing air 540±5 °C (exposure 8-12 h) + Aging at 200±5 °C (exposure 6-12 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.