# 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 10 ^{6} psi*

Elongation at Break

3.8 *%*

Fatigue Strength

72 *MPa* 10 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

18 *GPa* 2.7 *x 10 ^{6} psi*

Shear Strength

100 *MPa* 15 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

180 *MPa* 26 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

110 *MPa* 16 *x 10 ^{3} 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/cm ^{3}* 110

*lb/ft*

^{3}Embodied Carbon

22 *kg CO _{2}/kg material*

Embodied Energy

160 *MJ/kg* 67 *x 10 ^{3} BTU/lb*

Embodied Water

980 *L/kg* 120 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

5.9 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

120 *kJ/m ^{3}*

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 *mm ^{2}/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