Aluminum AlSi10Mg vs AlSi7Mg
Aluminum · grade comparison
Aluminum AlSi10Mg and AlSi7Mg are both aluminum grades. AlSi10Mg is the stronger of the two: yield strength 265 MPa (38.4 ksi) against 240 MPa (34.8 ksi) for AlSi7Mg, about 10% more; tensile strength follows at 460 MPa (66.7 ksi) vs 350 MPa (50.8 ksi). In exchange, AlSi7Mg is the more ductile: elongation 8% versus 7% for AlSi10Mg, and AlSi10Mg is harder (119 HB vs 105 HB). AlSi10Mg runs hotter in service (150°C vs 120°C continuous) and AlSi7Mg conducts electricity better (28 % IACS vs 24 % IACS). On the shop floor, AlSi7Mg welds better (very good vs good).
AlSi10MgChoose it when strength drives the design, or when the part sees heat.
AlSi7MgChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
AlSi10Mg vs AlSi7Mg: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all aluminum 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 aluminum 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.
Elastic (Young's) 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, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 26.5 GPa3.8 Msi · Bulk Modulus 69 GPa10 Msi · Poisson's Ratio 0.33
Physical
Density and transition temperatures.
Liquidus Temperature
Same in both: Density 2.67 g/cm³0.1 lb/in³ · Melting Point (Solidus) 557°C1,035 °F
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)
Same in both: Min Service Temperature -196°C-321 °F
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) -0.83 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Polishability
Same in both: Brazeability / Solderability 30 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 1,200 L/kg144 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 aluminum grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | AlSi10Mg | AlSi7Mg |
|---|---|---|
| Default condition | As Printed | As Printed |
| Relative cost | $$$ Premium | $$$ Premium |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both are offered for 3D printing. Both take the same 6 finishes: Anodized (Aluminum AM), Electroless Nickel (EN), Epoxy Coating, Gold Plating, Plated (Metal AM), Silver Plating.
AlSi10Mg vs AlSi7Mg — frequently asked
Is AlSi10Mg stronger than AlSi7Mg?
Yes. AlSi10Mg has a typical yield strength of 265 MPa (38.4 ksi) against 240 MPa (34.8 ksi) for AlSi7Mg — about 10% more. Tensile strength is 460 MPa (66.7 ksi) vs 350 MPa (50.8 ksi).
Which is cheaper, AlSi10Mg or AlSi7Mg?
Both sit in the same relative cost tier ($$$, premium); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, AlSi10Mg or AlSi7Mg?
AlSi7Mg. Its machinability rates good (58/100) against fair (50/100) for AlSi10Mg; for welding the order is AlSi7Mg first (very good, 70/100) then AlSi10Mg (good, 60/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in AlSi10Mg and AlSi7Mg 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.