Magnesium Alloy AZ91D Powder vs K1A
Magnesium Alloy · grade comparison
Magnesium Alloy AZ91D Powder and K1A are both magnesium alloy grades. AZ91D Powder is the stronger of the two: yield strength 245 MPa (35.5 ksi) against 55 MPa (7.98 ksi) for K1A, about 4.5 times as much; tensile strength follows at 290 MPa (42.1 ksi) vs 180 MPa (26.1 ksi). In exchange, K1A is the more ductile: elongation 19% versus 2.5% for AZ91D Powder, and AZ91D Powder is harder (75 HB vs 40 HB). K1A is lighter (1.74 g/cm³ vs 1.81 g/cm³ for AZ91D Powder) and K1A runs hotter in service (150°C vs 120°C continuous). On the shop floor, K1A welds better (very good vs good) and K1A sits in a lower cost tier (premium, $$$) than AZ91D Powder (high, $$$$).
AZ91D PowderChoose it when strength drives the design.
K1AChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
AZ91D Powder vs K1A: 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.
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 45 GPa6.5 Msi · Shear Modulus 17 GPa2.5 Msi · Poisson's Ratio 0.35
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).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Machinability 95 / 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 Powder | K1A |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
AZ91D Powder vs K1A — frequently asked
Is AZ91D Powder stronger than K1A?
Yes. AZ91D Powder has a typical yield strength of 245 MPa (35.5 ksi) against 55 MPa (7.98 ksi) for K1A — about 4.5 times as much. Tensile strength is 290 MPa (42.1 ksi) vs 180 MPa (26.1 ksi).
Which is cheaper, AZ91D Powder or K1A?
K1A is the lower-cost material: it sits in the premium tier ($$$) while AZ91D Powder is high ($$$$). 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, AZ91D Powder or K1A?
K1A. Its weldability rates very good (70/100) against good (60/100) for AZ91D Powder.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AZ91D Powder and K1A 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.