# K1A (K1A-F, M18010) Magnesium

K1A magnesium is a magnesium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. K1A is the ASTM designation for this material. M18010 is the UNS number.

It has a very low density among magnesium alloys. In addition, it has the highest melting temperature and a very high ductility.

The graph bars on the material properties cards below compare K1A magnesium 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

43 *GPa* 6.3 *x 10 ^{6} psi*

Elongation at Break

13 *%*

Fatigue Strength

39 *MPa* 5.6 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

17 *GPa* 2.4 *x 10 ^{6} psi*

Shear Strength

55 *MPa* 8.0 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

51 *MPa* 7.4 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

350 *J/g*

Maximum Temperature: Mechanical

120 *°C* 250 *°F*

Melting Completion (Liquidus)

650 *°C* 1210 *°F*

Melting Onset (Solidus)

650 *°C* 1200 *°F*

Solidification (Pattern Maker's) Shrinkage

1.6 *%*

Specific Heat Capacity

1000 *J/kg-K* 0.24 *BTU/lb-°F*

Thermal Conductivity

120 *W/m-K* 69 *BTU/h-ft-°F*

Thermal Expansion

27 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

30 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

170 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

13 *% relative*

Density

1.6 *g/cm ^{3}* 100

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

170 *MJ/kg* 72 *x 10 ^{3} BTU/lb*

Embodied Water

970 *L/kg* 120 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

17 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

30 *kJ/m ^{3}*

Stiffness to Weight: Axial

15 *points*

Stiffness to Weight: Bending

73 *points*

Strength to Weight: Axial

31 *points*

Strength to Weight: Bending

43 *points*

Thermal Diffusivity

75 *mm ^{2}/s*

Thermal Shock Resistance

11 *points*

## Alloy Composition

Mg | 98.7 to 99.6 | |

Zr | 0.4 to 1.0 | |

res. | 0 to 0.3 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings

Welding and Joining of Magnesium Alloys, Liming Liu (editor), 2010

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

Essential Readings in Magnesium Technology, Suveen N. Mathaudhu et al. (editors), 2014

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015