Magnesium HM31A-O (UNS M13312)

Image of Magnesium HM31A-O bars
Credit: CSIRO, CC BY 3.0, via Wikimedia Commons

HM31A-O is a magnesium alloy that is used in a variety of applications, including aerospace, automotive, and defense. It is known for its excellent strength, creep resistance, and corrosion resistance at elevated temperatures.

Chemical Composition
ElementMinMax
MagnesiumRemainder
Manganese1.2%
Thorium2.5%3.5%

The following table provides a list of magnesium HM31A-O properties in both SI and US customary/Imperial units.

Click on the icon to switch between Metric and Imperial units.

Table of Magnesium HM31A-O Properties
Physical Properties
Metric
Density1800 kg/m3
Mechanical PropertiesMetric
Tensile Strength (Ultimate)283 MPa
Tensile Strength (Yield)230 MPa
Elongation at Break10%
Thermal PropertiesMetric
Melting Point605 - 650 °C
Solidus605 °C
Liquidus650 °C
Thermal Conductivity104 W/m·K
Specific Heat Capacity (Cp)1050 J/kg·K
Coefficient of Thermal Expansion (αL)26.0 1/°C
Electrical PropertiesMetric
Electrical Resistivity6.60×10-6 Ω·cm

The values in this table are approximate and can vary depending on various factors such as the specific manufacturing process and heat treatment applied to the alloy.

Advantages & Disadvantages of Magnesium HM31A O

AdvantagesDisadvantages
High strengthHigh cost
Corrosion resistancePoor weldability
Good machinabilityLow melting point
LightweightLow stiffness
VersatileLimited availability

Applications of Magnesium HM31A O

Magnesium HM31A O is a high-strength, corrosion-resistant magnesium alloy that is used in a variety of applications, including:

  • Aerospace: Magnesium HM31A O is used in aircraft structures, such as wings, fuselages, and landing gear. It is also used in engine components, such as pistons and connecting rods.
  • Defense: Magnesium HM31A O is used in tanks, armored vehicles, and weapons. It is also used in night vision goggles and other electronic equipment.
  • Automotive: Magnesium HM31A O is used in engine blocks, chassis components, and wheels. It is also used in brake rotors and other high-performance components.
  • Medical: Magnesium HM31A O is used in implants, such as hip replacements and dental fillings. It is also used in surgical instruments, such as scalpels and needles.
  • Consumer goods: Magnesium HM31A O is used in sporting goods, such as golf clubs and bicycles. It is also used in electronics, such as laptops and cell phones.
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