Metals & alloys · Aluminium alloys
2219-T851 aluminium alloy
A weldable, heat-treatable Al–Cu alloy used for cryogenic tanks, launch vehicles and high-temperature aerospace structures.
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01
Overview
- Material class
- Metals & alloys
- Category
- Aluminium alloys
- Family
- 2xxx Aluminium Alloy
- Product forms
- Sheet/plate, Bar/rod, Casting
Composition
| Constituent | Min | Max | Typical | Note |
|---|---|---|---|---|
| Cu | 5.8 | 6.8 | 6.3 | |
| Mn | 0.2 | 0.4 | 0.3 | |
| Ti | 0.02 | 0.1 | 0.06 | |
| V | 0.05 | 0.15 | 0.1 | |
| Zr | 0.1 | 0.25 | 0.18 | |
| Al | Balance |
02
Properties and conditions
Engineering properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density | 2.84 | g/cm³ | Representative; verify product form and condition |
| Elastic modulus | 73 | GPa | Representative; verify product form and condition |
| Yield strength | ~350 | MPa | T851 plate |
| Tensile strength | ~455 | MPa | T851 plate |
| Elongation | 8–12 | % | Representative; verify product form and condition |
| Service temperature | up to ~175 | °C | application dependent |
Conditions
T851
Condition embedded in the canonical material designation.
03
Processing and use
Processing
- Product form, thermal history and manufacturing route materially affect performance.
Applications
- Launch-vehicle tanks
- Cryogenic vessels
- High-temperature aerospace panels
Selection considerations
- Corrosion protection is required in many environments.
- Weld properties and post-weld heat treatment control performance.
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04
Standards and related materials
Standards and designations
| System | Designation | Note |
|---|---|---|
| AA | 2219-T851 | |
| UNS | A92219 | |
| AMS | 4143 / 4094 | product dependent |
05
Sources and context
Sources
- The Aluminum Association alloy designation systemExisting reference
- NASA aluminium alloy design dataExisting reference
- NASA materials selection resourcesApplication reference
- U.S. Department of Energy lightweight materials programApplication reference
Confirm the applicable specification, product form and condition before using values for design or procurement.
Supply and sustainability
Availability and lead time depend on grade, product form, certification and regional supply chain.
Segregated recovery and closed-loop recycling improve material efficiency where practical.