AZ91E
UNS M11919
Description
Magnesium alloy AZ91E is a general-purpose gravity sand casting alloy containing aluminum, zinc and manganese. AZ91E is a high-purity alloy with excellent corrosion resistance and high tensile strength and moderate yield strength. The alloy can be used in aerospace casting applications particularly where there is no high temperature requirement or a requirement for pressure tightness. In general, it has three common variations, AZ91E-F, AZ91E-T4 and AZ91E-T6. Alfa Chemistry focus on AZ91E-T4 and AZ91E-T6 alloys (in the T4 and T6 temper).
General Information
| Items | AZ91E-T4 | AZ91E-T6 |
|---|---|---|
| Catalog | ACAM-Mg-A005 | ACAM-Mg-A006 |
| Density | 1.81 g/cm3 | 1.81 g/cm3 |
| Melting Range | 470 °C | 595 °C |
| Coefficient of Thermal Expansion | 27×10-6K-1 | 27×10-6K-1 |
| Thermal Conductivity | 84 Wm-1K-1 | 84 Wm-1K-1 |
| Electrical Resistivity | 141 nΩm | 141 nΩm |
Chemical Component
| Mg | Al | Zn | Mn |
|---|---|---|---|
| Balance | 8.1-9.3 | 0.4-1.0 | 0.17-0.35 |
* Unit: %
Typical Mechanical Properties
| Items | AZ91E-T4 | AZ91E-T6 |
|---|---|---|
| Hardness, Brinell | 75 | 75 |
| 0.2% Proof Stress | 125 MPa | 170 MPa |
| Tensile Strength | 260 MPa | 270 MPa |
| Elongation | 9% | 4.5% |
| Ultimate Compressive Stress | 400 MPa | 400 MPa |
| Ultimate Shear Stress | 140 MPa | 140 MPa |
| Rotating bend (5 x107 cycles) | 70 MPa | 70 MPa |
| Poisson's Ratio | 0.35 | 0.35 |
Material Forms
Magnesium alloy AZ91E we can provide is available in Forgings.
Weldability
Sand castings are weldable by the tungsten arc inert gas process (TIG) with a filler rod of a similar composition. Castings should be welded in the T4 or T6 condition and heat treated after welding. This may either be for 30 mins at 415˚C plus 4 hours at 215˚C or 16 hours at 170˚C.
Heat Treatment
For optimum properties the alloy should be used in the T6 condition i.e. 16 to 24 hours at 400˚C - 420˚C, air-cool, and then 8 to 16 hours at 180˚C to 210˚C. Alternatively it may be used in the T4 condition i.e. 16 to 24 hours at 400˚C to 420˚C.
Applications
Forgings in AZ91E find application in high strength parts for:
- Automotive components
- Electrical components
- Aerospace components
- Medical devices
- Sporting goods
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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