AZ91/SiC/15p T4 vs AZ91/SiC/15p T6
Composite · AZ91/SiC/15p grade comparison
AZ91/SiC/15p T4 and AZ91/SiC/15p T6 are two grades of the same composite grade, AZ91/SiC/15p: T4 (solution heat treated and naturally aged) versus T6 (solution heat treated and artificially aged). The chemistry is identical, so every difference below comes from the condition. AZ91/SiC/15p T6 is the stronger of the two: yield strength 175 MPa (25.4 ksi) against 120 MPa (17.4 ksi) for AZ91/SiC/15p T4, about 46% more; tensile strength follows at 250 MPa (36.3 ksi) vs 230 MPa (33.4 ksi). In exchange, AZ91/SiC/15p T4 is the more ductile: elongation 2.5% versus 1% for AZ91/SiC/15p T6. AZ91/SiC/15p T6 runs hotter in service (150°C vs 120°C continuous) and AZ91/SiC/15p T6 conducts heat better (78 W/m·K vs 66 W/m·K).
AZ91/SiC/15p T4Choose it when the part is bent, formed or impact-loaded.
AZ91/SiC/15p T6Choose it when strength drives the design, or when the part sees heat.
AZ91/SiC/15p T4 vs AZ91/SiC/15p T6: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all composite 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 composite 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.
AZ91/SiC/15p T4AZ91/SiC/15p T6
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
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Same in both: Shear Modulus 21.8 GPa3.2 Msi · Bulk Modulus 50 GPa7.3 Msi · Poisson's Ratio 0.31 · Compressive Modulus 57 GPa8.3 Msi
Physical
Density and transition temperatures.
Same in both: Density 2.02 g/cm³0.07 lb/in³
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 970 J/kg·K0.23 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 21.5 µm/m·K11.9 µin/in·°F · Min Service Temperature -50°C-58 °F · Max Service Temperature (short-term) 200°C392 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 300 MJ/kg128,977 BTU/lb · Embodied Carbon (primary production) 30 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 5%
Strength versus weight
Yield strength against density for every composite grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
AZ91/SiC/15p T4 vs AZ91/SiC/15p T6 — frequently asked
Is AZ91/SiC/15p T6 stronger than AZ91/SiC/15p T4?
Yes. AZ91/SiC/15p T6 has a typical yield strength of 175 MPa (25.4 ksi) against 120 MPa (17.4 ksi) for AZ91/SiC/15p T4 — about 46% more. Tensile strength is 250 MPa (36.3 ksi) vs 230 MPa (33.4 ksi).
Which grade does FabDigit quote by default, T4 or T6?
F is the default AZ91/SiC/15p condition in the FabDigit quote flow (neither T4 nor T6). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
When should I choose AZ91/SiC/15p T4 over AZ91/SiC/15p T6?
Pick AZ91/SiC/15p T4 when the part is bent, formed or impact-loaded. Pick AZ91/SiC/15p T6 when strength drives the design, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AZ91/SiC/15p T4 and AZ91/SiC/15p T6 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.