Magnesium Alloy AS41B vs ZK51A
Magnesium Alloy · grade comparison
Magnesium Alloy AS41B and ZK51A are both magnesium alloy grades. ZK51A is the stronger of the two: yield strength 165 MPa (23.9 ksi) against 140 MPa (20.3 ksi) for AS41B, about 18% more. In exchange, AS41B is the more ductile: elongation 6% versus 3.5% for ZK51A, and AS41B is harder (75 HB vs 65 HB). AS41B runs hotter in service (175°C vs 120°C continuous) and ZK51A conducts heat better (109 W/m·K vs 68 W/m·K). On the shop floor, AS41B welds better (fair vs poor) and AS41B sits in a lower cost tier (standard, $$) than ZK51A (premium, $$$).
AS41BChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ZK51AChoose it when strength drives the design.
AS41B vs ZK51A: 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.
Shear Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Same in both: Elastic (Young's) Modulus 45 GPa6.5 Msi · Bulk Modulus 45 GPa6.5 Msi · Poisson's Ratio 0.35 · Fatigue Strength (Endurance Limit) 70 MPa10.2 ksi
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)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Latent Heat of Fusion 340 J/g146 BTU/lb
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Castability
Same in both: Formability (cold) 10 / 100 · Brazeability / Solderability 15 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Typical Recycled Content
Same in both: Embodied Energy (primary production) 320 MJ/kg137,575 BTU/lb · Embodied Carbon (primary production) 32 kg CO₂/kg · 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 | AS41B | ZK51A |
|---|---|---|
| CNC machining | 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 | — |
AS41B vs ZK51A — frequently asked
Is ZK51A stronger than AS41B?
Yes. ZK51A has a typical yield strength of 165 MPa (23.9 ksi) against 140 MPa (20.3 ksi) for AS41B — about 18% more. Tensile strength is 205 MPa (29.7 ksi) vs 215 MPa (31.2 ksi).
Which is cheaper, AS41B or ZK51A?
AS41B is the lower-cost material: it sits in the standard tier ($$) while ZK51A is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which welds better, AS41B or ZK51A?
AS41B. Its weldability rates fair (35/100) against poor (15/100) for ZK51A.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AS41B and ZK51A 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.