Alloy Ml4pch

  • 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 МЛ4пч
    Designation GOST Latin ML4pch
    Transliteration ML4pch
    By chemical elements CuЛ4пч

    Description

    Alloy Ml4pch used: for the manufacture of shaped castings for critical applications operating in conditions of high humidity, tropical and marine climate.

    Note

    Alloy system Mg-Al-Zn.
    Casting alloy Ml4pch (high purity) have an even higher corrosion resistance and ductility than МЛ4.
    Aluminum and zinc increase the mechanical properties of the alloy (and the effect of aluminum effect is stronger than zinc) and manganese improves corrosion resistance. To reduce oxidation, the alloy is injected beryllium (0.002% when casting in sand molds and the mold and to 0.01% when casting under pressure).
    The alloy can strengthen its positions heat treatment — quenching and aging.
    The alloy has a broader crystallization range than alloys based on aluminum, therefore has a low castability. Due to the large interval of crystallization of the alloy is prone to hot cracks.

    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 90248-77

    Chemical composition

    Standard Mn Si Ni Fe Cu Al Zn Zr Mg Be
    GOST 2856-79 0.15-0.5 ≤0.08 ≤0.002 ≤0.007 ≤0.04 5-7 2-3.5 ≤0.002 Rest ≤0.002
    Mg is the basis.
    According to GOST 2856-79 the sum of the detected impurities is 0.130%. With a simultaneous content of beryllium and zirconium, the mass fraction of beryllium should not exceed 0.0015%.

    Mechanical properties

    Section, mm sT|s0,2, MPa σU, MPa d5, %
    Casting in sand molds, shell molds and in the mold without heat treatment according to GOST 2856-79
    ≥80 ≥160 ≥3
    Casting in sand mold, shell mold and shell mold according to GOST 2856-79. Mode T4: Homogenization + annealing in air
    ≥80 ≥220 ≥5
    Casting in sand mold, shell mold and shell mold according to GOST 2856-79. T6 mode: Homogenization + annealing at air + aging
    ≥100 ≥225 ≥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 795 10476

    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 and the shell molds following the recommended modes of heat treatment: T2 (to reduce internal stresses) - Annealing at 350±5 °C (delay 2-3 hours), air cooling. For a significant increase in mechanical properties of the alloy (σв, δ, EA), heat treatment is performed on taimu T4 Annealing in air of 380±5 °C (extract 8-16 h). Due to the low rate of diffusion processes as the cooling medium is usually a calm air. To improve the mechanical properties of the cooled castings may be conducted by blowing of air. To improve the mechanical properties (σв, σ0,2) applied heat treatment by mode T6 - Tempering air with 380±5 °C (extract 8-16 h) and Aging at 175±5 °C (delay of 12-16 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.