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
| Mg | 86.1 to 89.8 | |
| Al | 8.3 to 9.7 | |
| Zn | 1.7 to 2.3 | |
| Mn | 0.15 to 1.5 | |
| Si | 0 to 0.050 | |
| Cu | 0 to 0.050 | |
| Ni | 0 to 0.0050 | |
| Fe | 0 to 0.0050 | |
| Be | 0.00020 to 0.00080 | |
| res. | 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