Alloy ML15

  • 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 МЛ15
    Designation GOST Latin ML15
    Transliteration ML15
    By chemical elements CuЛ15

    Description

    Alloy ML15 is used: for the manufacture of castings loaded parts, requiring leak with extreme operating temperature of +200 °C — long, +300−350 °C — short-term.

    Note

    Alloy system Mg-Zn-Zr.
    Doping with zirconium refines the grain, reduces the temperature interval of crystallization and, therefore, improves mechanical and casting properties. Lantana several additives increase the heat resistance, improve weldability, but lower strength and ductility at room temperature. ML15 alloy, optionally doped with lanthanum (0.6% to 1.2%), has high heat resistance, good weldability, has a low tendency to the formation of rihlat and hot cracks. Strength and ductility at room temperature is inferior to the alloy ML12.
    Compared with the alloys of the system Mg-Al-Zn alloy has several advantages. It possess higher strength characteristics. Refinement of the structure with the introduction of Zirconia reduces the sensitivity of the alloy to the thickness of the cross section of the casting. Due to the smaller grain size in castings microregion less than in the casting of alloys МЛ4 or ML5.

    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 Mg La
    GOST 2856-79 ≤0.03 ≤0.005 ≤0.01 ≤0.03 ≤0.02 4-5 0.7-1.1 Rest 0.6-1.2
    Mg is the basis.
    According to GOST 2856-79, the content of other impurities is ≤ 0.12%, the sum of the impurities being determined is 0.20%.

    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. Mode T1: Aging
    ≥130 ≥210 ≥3
    Casting forming OST 1 90200-75. In the delivery condition specified in the casting method, delivery condition and strength class KP
    ≥142 ≥220 ≥3
    ≥137 ≥206 ≥2.5
    ≥132 ≥191 ≥2
    ≥128 ≥177 ≥2

    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) С, J/(kg · °C)
    20 43 1830 1381 9211

    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 casting in the ground, shell molding, gravity die casting, investment casting and plaster mold to enhance mechanical properties of castings (σв, σ0,2) applied heat treatment regime T1 - Aging at 300±5 °With (extract 5-6 h), air cooling.