Editorial Feature

Magnesium AZ63A-T7 (UNS M11630) Alloy

Magnesium is among the most abundantly available metals on the earth’s crust. Its applications are limited by its easily ignitable nature. It is commonly alloyed with non-ferrous metals like aluminum, copper, nickel, etc.

Magnesium AZ63A-T7 is a sand cast alloy, which exhibits good strength at room temperature. The ductility and toughness of this alloy are also considerably high. This datasheet will elaborate on the properties and applications of this alloy.

Chemical Composition

The following table provides the chemical composition of magnesium AZ63A-T7 alloy.

Element Content (%)
Magnesium, Mg 91
Aluminum, Al 5.3-6.7
Zinc, Zn 2.5-3.5
Silicon, Si ≤0.30
Copper, Cu ≤0.25
Manganese, Mn ≥0.15
Nickel, Ni ≤0.010

Physical Properties

The physical properties of magnesium AZ63A-T7 alloy are given in the following table.

Properties Metric Imperial
Density 1.83 g/cc 0.0661 lb/in³
Melting Point(Incipient melting) ≥360°C ≥680°F

Mechanical Properties

The mechanical properties of magnesium AZ63A-T7 alloy are listed in the table below.

Properties Metric Imperial
Tensile Strength 275 MPa 39900 psi
Yield strength (@strain 0.200%) 115 MPa 16700 psi
Compressive Yield Strength (at 0.2% offset) 115 MPa 16700 psi
Ultimate Bearing Strength 515 MPa 74700 psi
Bearing Yield Strength 515 MPa 74700 psi
Elongation at break (in 50 mm) 6% 6%
Elastic Modulus (in tension) 45 GPa 6530 ksi
Poisson's ratio 0.35 0.35
Shear Modulus 17 GPa 2470 ksi
Shear Strength 140 MPa 20300 psi
Machinability (relative rating, 100=Best) 100 100
Hardness, Brinell (500 kg load, 10 mm ball) 64 64
Hardness, Knoop (estimated from Brinell) 87 87
Hardness, Vickers (estimated from Brinell) 76 76
Hardness, Rockwell E 76 76

Thermal Properties

The following table provides the thermal properties of magnesium AZ63A-T7 alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@ 0.000-100°C/32-212°F) 26.1 µm/m°C 14.5 µin/in°F
Thermal Conductivity 65.1 W/mK 452 BTU in/hr.ft².°F

Other Designations

Some of the other designations that are used to denote magnesium AZ63A-T7 alloy are:

  • UNS M11630
  • Elektron AZG
  • AMS 4420
  • AMS 4422
  • ASTM B 80


Magnesium AZ63A-T7 alloy is used in the manufacture of commercial and military structures that require medium strength and good ductility and toughness.

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