Alloy МЛ17 (ВМЛ5)

Designation

Name The value
Designation GOST Cyrillic МЛ17
Designation GOST Latin ML17
Transliteration ML17
By chemical elements CuЛ17
Name The value
Designation GOST Cyrillic ВМЛ5
Designation GOST Latin BML5
Transliteration VML5
By chemical elements ВCuЛ5

Description

Alloy МЛ17 used: for the manufacture of various shaped precision castings parts, aerospace casting techniques, sand casting, gravity die casting, investment casting and plaster mold.

Note

Industrial heat resistant magnesium alloy system MD-REE-Zr.

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 Si Ni Fe Cu Al Zn Zr Nd Mg Cd
OST 1 90168-75 ≤0.03 ≤0.01 ≤0.01 ≤0.03 ≤0.03 7.8-9.2 0.7-1.1 0.03-0.3 Rest 0.2-1.2
Mg is the basis.
According to OST 1 90168-75 the chemical composition is given for the alloy grade ML17 (VML5). The sum of 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
≥130 ≥220 ≥4
≥200 ≥300 ≥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

Technological properties

Name The value
Features of heat treatment According to OST 1 90121-90 to improve the mechanical properties (σв, σ0,2) castings into the ground, gravity die casting, investment casting and plaster mold apply heat treatment by mode T6 - Tempering by blowing air from 435±5 °C (extract 4-20 h) + aged at 155±5 °C (extract 24-50 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. To maximize the mechanical properties of the alloy (σв, σ0,2) mode is applied Kzt61 - Quenching in warm water (80-90 °C) 350±5 °C (Step heating to 435±5 °C (extract 4-20 h), the heating to 350±5 °C (exposure 0-6 HR)) + aged at 155±5 °C (extract 24-50 h), air cooling.