Magnesium Alloy AM100A-T4 vs AM100A-T7
Magnesium Alloy · AM100A temper comparison
AM100A-T4 and AM100A-T7 are two conditions of the same magnesium alloy grade, AM100A: T4 (solution heat treated and naturally aged) versus T7 (solution heat treated and overaged (stabilized)). The chemistry is identical, so every difference below comes from the condition. AM100A-T7 is the stronger of the two: yield strength 110 MPa (16 ksi) against 83 MPa (12 ksi) for AM100A-T4, about 33% more. In exchange, AM100A-T4 is the more ductile: elongation 10% versus 4% for AM100A-T7, and AM100A-T7 is harder (63 HB vs 53 HB). AM100A-T7 runs hotter in service (150°C vs 110°C continuous).
AM100A-T4Choose it when the part is bent, formed or impact-loaded.
AM100A-T7Choose it when strength drives the design, or when the part sees heat.
AM100A-T4 vs AM100A-T7: 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) 465°C869 °F · Liquidus Temperature 598°C1,108 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 1,000 J/kg·K0.24 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 25.2 µm/m·K14 µin/in·°F · Latent Heat of Fusion 373 J/g160 BTU/lb · Min Service Temperature -100°C-148 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 12 % IACS · Electrical Resistivity 1.4×10⁻⁷ Ω·m5.51 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -1.55 V
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 %) 400% · Formability (cold) 8 / 100 · Castability 82 / 100 · Brazeability / Solderability 20 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 320 MJ/kg137,575 BTU/lb · Embodied Carbon (primary production) 30 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 25%
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.
AM100A-T4 vs AM100A-T7 — frequently asked
Is AM100A-T7 stronger than AM100A-T4?
Yes. AM100A-T7 has a typical yield strength of 110 MPa (16 ksi) against 83 MPa (12 ksi) for AM100A-T4 — about 33% more. Tensile strength is 250 MPa (36.3 ksi) vs 275 MPa (39.9 ksi).
Which condition does FabDigit quote by default, T4 or T7?
T6 is the default AM100A condition in the FabDigit quote flow (neither T4 nor T7). 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 AM100A-T4 over AM100A-T7?
Pick AM100A-T4 when the part is bent, formed or impact-loaded. Pick AM100A-T7 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 AM100A-T4 and AM100A-T7 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.