Lightweight MG · Mg-Al-Zn Cast
Magnesium Alloy AZ91D
Magnesium Alloy AZ91D is a lightweight mg magnesium alloy — workhorse die-cast magnesium. Typical values: 160 MPa yield, 1.81 g/cm³, rated to 150 °C. Available for CNC machining, Casting & forging at FabDigit.
Properties
Typical room-temperature values in the As Cast condition. Metric first, imperial in gray. The bars show where AZ91D sits against the other 12 magnesium alloy grades in the catalog.
Datasheet
| Yield strength | 160 MPa23 ksi |
|---|---|
| Tensile strength | 230 MPa33 ksi |
| Hardness | 63 HB |
| Density | 1.81 g/cm³0.065 lb/in³ |
| Specific strength (yield ÷ density) | 88 |
| Min service temp | -100 °C-148 °F |
| Max service temp | 150 °C302 °F |
| Electrical conductivity | 15 % IACS8.7 MS/m |
| Machinability | Excellent92 / 100 |
| Weldability | Very good75 / 100 |
| Formability | Fair40 / 100 |
| ISO 513 machining group | N |
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Against other magnesium alloy grades
Strength versus weight in the magnesium alloy family
Yield strength against density for every magnesium alloy grade FabDigit runs. AZ91D is highlighted; hover a dot for its name, or open the interactive family chart.
Manufacturability
The process limits FabDigit's quote engine applies to AZ91D. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Excellent92 / 100 |
|---|---|
| ISO material group | N.7 |
| Cutting speed (rough / finish) | 400 / 460 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1.5 mm |
| Drill depth limit | 8× diameter |
| Best surface (machined / polished) | Ra 0.8 / — |
| Hardenable after machining | No |
Conditions and tempers
How AZ91D is supplied and what each state is for. The default is what FabDigit quotes unless your drawing says otherwise.
| Condition | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
As CastDefault Finish State | Rough surface acceptable — hidden or machined-over faces | — | — | — | — |
Stress Relieved Heat Treat State | Holds tight flatness/tolerance through heavy machining | — | — | — | — |
Heat treatment and post-processing
Operations FabDigit's suppliers routinely run on AZ91D, ranked by how often they make sense for this grade.
Heat treatment
| Full Anneal | Restore ductility; relieve residual stress; coarsen grain |
|---|---|
| Stress Relief | Reduce residual stress without changing structure |
Post-processing
| Manual Deburr | Deburrstandard |
|---|---|
| Edge Break (0.5mm) | Deburr |
| CMM Inspection | Inspection |
| FAI Report | Inspection |
| Individual Bag | Packaging |
Surface finishes for AZ91D
Coatings and treatments compatible with magnesium alloy on the processes AZ91D runs on. Pick them in the quote configurator or call them out on the drawing.
Conversion Coating
- Anodizing Type II
- Chem Film (Alodine)
- Hard Anodize Type III w/ PTFE
- Hard Anodizing Type III
Organic Coating
- E-Coating
- Painting
- Powder Coating
Marking / Decoration
- Chemical Etching
- Dot Peen Marking
- Electro-chemical Etching
- Ink Stamping
- Laser Marking
- Mechanical Engraving
- Steel Stamping
- Vibro Engraving / Scribing
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy AZ91D in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- M11916
- Trade names
- Die Cast Magnesium
Stock forms
Raw-material forms FabDigit sources AZ91D in.
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.