# ZK51A (ZK51A-T5, M16510) Magnesium

ZK51A magnesium is a magnesium alloy. Cited properties are appropriate for the T5 temper. To achieve this temper, the metal is artificially aged until it meets standard mechanical property requirements. ZK51A is the ASTM designation for this material. M16510 is the UNS number.

It has a fairly high electrical conductivity among magnesium alloys. In addition, it has a moderately high base cost and a moderately high thermal conductivity.

The graph bars on the material properties cards below compare ZK51A 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

45 *GPa* 6.6 *x 10 ^{6} psi*

Elongation at Break

4.7 *%*

Fatigue Strength

62 *MPa* 9.0 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

18 *GPa* 2.6 *x 10 ^{6} psi*

Shear Strength

160 *MPa* 23 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

240 *MPa* 35 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

150 *MPa* 22 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

340 *J/g*

Maximum Temperature: Mechanical

120 *°C* 250 *°F*

Melting Completion (Liquidus)

640 *°C* 1190 *°F*

Melting Onset (Solidus)

550 *°C* 1020 *°F*

Solidification (Pattern Maker's) Shrinkage

1.3 *%*

Specific Heat Capacity

970 *J/kg-K* 0.23 *BTU/lb-°F*

Thermal Conductivity

110 *W/m-K* 64 *BTU/h-ft-°F*

Thermal Expansion

26 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

28 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

140 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

13 *% relative*

Density

1.8 *g/cm ^{3}* 120

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

160 *MJ/kg* 71 *x 10 ^{3} BTU/lb*

Embodied Water

940 *L/kg* 110 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

10 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

260 *kJ/m ^{3}*

Stiffness to Weight: Axial

14 *points*

Stiffness to Weight: Bending

64 *points*

Strength to Weight: Axial

36 *points*

Strength to Weight: Bending

47 *points*

Thermal Diffusivity

61 *mm ^{2}/s*

Thermal Shock Resistance

15 *points*

## Alloy Composition

Mg | 93.1 to 95.9 | |

Zn | 3.6 to 5.5 | |

Zr | 0.5 to 1.0 | |

Cu | 0 to 0.1 | |

Ni | 0 to 0.010 | |

res. | 0 to 0.3 |

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

## Followup Questions

## Similar Alloys

## Further Reading

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