# 2195 (2195-T8) Aluminum

2195 aluminum is a 2000-series aluminum alloy: the main alloying addition is copper, and it is formulated for primary forming into wrought products. Cited properties are appropriate for the T8 temper. To achieve this temper, the metal is solution heat-treated, strain hardened, then artificially aged. 2195 is the Aluminum Association (AA) designation for this material. In European standards, it will be given as EN AW-2195. Additionally, the UNS number is A92195.

It received its standard designation in 1992, making it a fairly young material.

The graph bars on the material properties cards below compare 2195 aluminum to: 2000-series alloys (top), all aluminum alloys (middle), 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

69 *GPa* 10 *x 10 ^{6} psi*

Elongation at Break

9.3 *%*

Fatigue Strength

190 *MPa* 28 *x 10 ^{3} psi*

Fracture Toughness

30 *MPa-m ^{1/2}* 27

*x 10*

^{3}psi-in^{1/2}Poisson's Ratio

0.33

Shear Modulus

26 *GPa* 3.8 *x 10 ^{6} psi*

Shear Strength

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

Tensile Strength: Ultimate (UTS)

590 *MPa* 86 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

560 *MPa* 82 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

390 *J/g*

Maximum Temperature: Mechanical

210 *°C* 420 *°F*

Melting Completion (Liquidus)

660 *°C* 1220 *°F*

Melting Onset (Solidus)

550 *°C* 1020 *°F*

Specific Heat Capacity

900 *J/kg-K* 0.22 *BTU/lb-°F*

Thermal Conductivity

130 *W/m-K* 77 *BTU/h-ft-°F*

Thermal Expansion

23 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

34 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

100 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

31 *% relative*

Density

3.0 *g/cm ^{3}* 190

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

160 *MJ/kg* 70 *x 10 ^{3} BTU/lb*

Embodied Water

1470 *L/kg* 180 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

54 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

2290 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

46 *points*

Strength to Weight: Axial

55 *points*

Strength to Weight: Bending

53 *points*

Thermal Diffusivity

49 *mm ^{2}/s*

Thermal Shock Resistance

26 *points*

## Alloy Composition

Among wrought aluminum alloys, the composition of 2195 aluminum is notable for including lithium (Li) and silver (Ag). Lithium is used to improve mechanical properties at the cost of increased fabrication difficulty. Silver is used to improve strength and resistance to stress corrosion cracking.

Al | 91.9 to 94.9 | |

Cu | 3.7 to 4.3 | |

Li | 0.8 to 1.2 | |

Mg | 0.25 to 0.8 | |

Ag | 0.25 to 0.6 | |

Mn | 0 to 0.25 | |

Zn | 0 to 0.25 | |

Zr | 0.080 to 0.16 | |

Fe | 0 to 0.15 | |

Si | 0 to 0.12 | |

Ti | 0 to 0.1 | |

res. | 0 to 0.15 |

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

## Followup Questions

## Similar Alloys

## Further Reading

Aluminum-Lithium Alloys: Processing, Properties, and Applications, N. Eswara Prasad et al. (editors), 2013

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