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AWS BMg-1 (M19001) Filler Metal

AWS BMg-1 is a magnesium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BMg-1 is the AWS designation for this material. M19001 is the UNS number.

It has a very low melting temperature among magnesium alloys. In addition, it has a moderately low electrical conductivity and a fairly low tensile strength.

The graph bars on the material properties cards below compare AWS BMg-1 to other magnesium alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

47 GPa 6.9 x 106 psi

Elongation at Break

3.8 %

Fatigue Strength

72 MPa 10 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

18 GPa 2.7 x 106 psi

Shear Strength

100 MPa 15 x 103 psi

Tensile Strength: Ultimate (UTS)

180 MPa 26 x 103 psi

Tensile Strength: Yield (Proof)

110 MPa 16 x 103 psi

Thermal Properties

Brazing Temperature

600 to 630 °C 1120 to 1160 °F

Latent Heat of Fusion

350 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

Melting Completion (Liquidus)

600 °C 1110 °F

Melting Onset (Solidus)

440 °C 830 °F

Specific Heat Capacity

980 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

76 W/m-K 44 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

55 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

1.8 g/cm3 110 lb/ft3

Embodied Carbon

22 kg CO2/kg material

Embodied Energy

160 MJ/kg 67 x 103 BTU/lb

Embodied Water

980 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

5.9 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

66 points

Strength to Weight: Axial

27 points

Strength to Weight: Bending

39 points

Thermal Diffusivity

43 mm2/s

Thermal Shock Resistance

10 points

Alloy Composition

Magnesium (Mg) 86.1 to 89.8
Aluminum (Al) 8.3 to 9.7
Zinc (Zn) 1.7 to 2.3
Manganese (Mn) 0.15 to 1.5
Silicon (Si) 0 to 0.050
Copper (Cu) 0 to 0.050
Nickel (Ni) 0 to 0.0050
Iron (Fe) 0 to 0.0050
Beryllium (Be) 0.00020 to 0.00080
Residuals 0 to 0.3

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding