Magnesium Alloy AZ91C-T5 vs AZ91C-T6
Magnesium Alloy · AZ91C temper comparison
AZ91C-T5 and AZ91C-T6 are two conditions of the same magnesium alloy grade, AZ91C: T5 (cooled from hot working and artificially aged) versus T6 (solution heat treated and artificially aged). The chemistry is identical, so every difference below comes from the condition. AZ91C-T6 is the stronger of the two: yield strength 145 MPa (21 ksi) against 110 MPa (16 ksi) for AZ91C-T5, about 32% more; tensile strength follows at 275 MPa (39.9 ksi) vs 165 MPa (23.9 ksi). AZ91C-T6 is the more ductile: elongation 6% versus 2% for AZ91C-T5, and AZ91C-T6 is harder (70 HB vs 65 HB).
AZ91C-T6Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
AZ91C-T5 vs AZ91C-T6: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
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
Physical
Density and transition temperatures.
Same in both: Density 1.81 g/cm³0.07 lb/in³ · Melting Point (Solidus) 470°C878 °F · Liquidus Temperature 595°C1,103 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 72 W/m·K41.6 BTU/hr·ft·°F · Specific Heat Capacity 1,050 J/kg·K0.25 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 26 µm/m·K14.4 µin/in·°F · Latent Heat of Fusion 373 J/g160 BTU/lb · Max Service Temperature (continuous) 120°C248 °F · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 12 % IACS · Electrical Resistivity 1.41×10⁻⁷ Ω·m5.55 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -1.55 V · Corrosion Resistance 20 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Same in both: Machinability 95 / 100 · Machinability Rating (AISI 1212 = 100 %) 480% · Formability (cold) 12 / 100 · Castability 85 / 100 · Brazeability / Solderability 20 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 355 MJ/kg152,623 BTU/lb · Embodied Carbon (primary production) 28 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 35%
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.
AZ91C-T5 vs AZ91C-T6 — frequently asked
Is AZ91C-T6 stronger than AZ91C-T5?
Yes. AZ91C-T6 has a typical yield strength of 145 MPa (21 ksi) against 110 MPa (16 ksi) for AZ91C-T5 — about 32% more. Tensile strength is 275 MPa (39.9 ksi) vs 165 MPa (23.9 ksi).
Which condition does FabDigit quote by default, T5 or T6?
F is the default AZ91C condition in the FabDigit quote flow (neither T5 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.
Which welds better, AZ91C-T5 or AZ91C-T6?
AZ91C-T5. Its weldability rates very good (70/100) against good (65/100) for AZ91C-T6.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AZ91C-T5 and AZ91C-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.