Magnesium Alloy AZ91D vs ZC63A
Magnesium Alloy · grade comparison
Magnesium Alloy AZ91D and ZC63A are both magnesium alloy grades. AZ91D is the stronger of the two: yield strength 160 MPa (23.2 ksi) against 145 MPa (21 ksi) for ZC63A, about 10% more; tensile strength follows at 230 MPa (33.4 ksi) vs 210 MPa (30.5 ksi). In exchange, ZC63A is the more ductile: elongation 5% versus 3% for AZ91D, and AZ91D is harder (75 HV vs 63 HV). AZ91D is lighter (1.81 g/cm³ vs 1.87 g/cm³ for ZC63A) and ZC63A runs hotter in service (150°C vs 120°C continuous). On the shop floor, AZ91D sits in a lower cost tier (standard, $$) than ZC63A (premium, $$$).
AZ91DChoose it when strength drives the design, or when weight is the constraint.
ZC63AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
AZ91D vs ZC63A: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all magnesium alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all magnesium alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Reduction in Area
Same in both: Elastic (Young's) Modulus 45 GPa6.5 Msi · Shear Modulus 17 GPa2.5 Msi · Bulk Modulus 45 GPa6.5 Msi · Poisson's Ratio 0.35 · Shear Strength 140 MPa20.3 ksi · Fracture Toughness (K_IC) 13 MPa·√m11.8 ksi·√in
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -1.55 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Castability
Polishability
Same in both: Weldability 40 / 100 · Brazeability / Solderability 20 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 500 L/kg59.9 gal/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every magnesium alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | AZ91D | ZC63A |
|---|---|---|
| CNC machining | Yes | — |
| Casting & forging | Yes | — |
| Default condition | As Cast | — |
| Relative cost | $$ Standard | $$$ Premium |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 0.8 µm | — |
| Anodizing Type II | Yes | — |
| Chem Film (Alodine) | Yes | — |
| E-Coating | Yes | — |
| Hard Anodize Type III w/ PTFE | Yes | — |
| Hard Anodizing Type III | Yes | — |
| Painting | Yes | — |
| Powder Coating | Yes | — |
AZ91D vs ZC63A — frequently asked
Is AZ91D stronger than ZC63A?
Yes. AZ91D has a typical yield strength of 160 MPa (23.2 ksi) against 145 MPa (21 ksi) for ZC63A — about 10% more. Tensile strength is 230 MPa (33.4 ksi) vs 210 MPa (30.5 ksi).
Which is cheaper, AZ91D or ZC63A?
AZ91D is the lower-cost material: it sits in the standard tier ($$) while ZC63A is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
When should I choose AZ91D over ZC63A?
Pick AZ91D when strength drives the design, or when weight is the constraint. Pick ZC63A when the part is bent, formed or impact-loaded, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AZ91D and ZC63A side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.