Aluminum AlSi10Mg · heat-treated state
Aluminum AlSi10Mg Stress Relieved
Properties of the Stress Relieved condition, compared with the other AlSi10Mg tempers.
Standard industrial default for dimensional stability: removes build residual stress and anisotropy at the cost of ~25 % strength, gaining ductility and thermal conductivity.
What is AlSi10Mg Stress Relieved?
AlSi10Mg Stress Relieved is AlSi10Mg heat treated to Stress Relieved — standard industrial default for dimensional stability: removes build residual stress and anisotropy at the cost of ~25 % strength, gaining ductility and thermal conductivity. AlSi10Mg Stress Relieved has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 345 MPa (50 ksi) — stronger than 57% of aluminum grades. Elongation at break is 10% and the elastic modulus is 70 GPa (10.2 Msi). AlSi10Mg Stress Relieved has a density of 2.67 g/cm³ (0.0965 lb/in³), lighter than 78% of aluminum grades. It melts at 557°C (1,035 °F). As Printed is the default condition FabDigit quotes; Stress Relieved is available on request or by drawing note.
Advantages
- High service temperature — 180°C (356 °F), better than 86% of aluminum grades
Limitations
- High embodied carbon — 15 kg CO₂/kg, worse than 97% of aluminum grades
- Limited formability — 10/100, worse than 81% of aluminum grades
AlSi10Mg Stress Relieved properties
Typical room-temperature values for AlSi10Mg Stress Relieved — 12 properties are specific to this condition; the rest are grade-level values shared by every AlSi10Mg temper. Each bar shows where the value sits among the aluminum grades in FabDigit's library — further right is higher.
Physical3
AlSi10Mg Stress Relieved has a density of 2.67 g/cm³ (0.0965 lb/in³), lighter than 78% of aluminum grades. It melts at 557°C (1,035 °F).
Mechanical15
AlSi10Mg Stress Relieved has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 345 MPa (50 ksi) — stronger than 57% of aluminum grades. Elongation at break is 10% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
AlSi10Mg Stress Relieved is rated for continuous service to 180°C (356 °F). It conducts heat at 150 W/m·K (86.7 BTU/hr·ft·°F), better than 58% of aluminum grades. Thermal expansion is 21 µm/m·K (11.7 µin/in·°F).
Electrical3
AlSi10Mg Stress Relieved conducts electricity at 32 % IACS, worse than 63% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 51% of aluminum grades.
Sustainability4
Producing a kilogram of AlSi10Mg Stress Relieved takes about 240 MJ of energy and emits 15 kg of CO₂ — more than 98% of aluminum grades. Typical recycled content is 5%.
Manufacturability8
AlSi10Mg Stress Relieved's machinability is good (55/100, worse than 58% of aluminum grades); weldability good (60/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other AlSi10Mg tempers and conditions
AlSi10Mg is also supplied in 6 other conditions. The full side-by-side table is on the AlSi10Mg overview.
- As PrintedDefaultHighest strength/hardness straight off the plate; use when residual stress and anisotropy are acceptable and parts are small or well supported.265 MPa yield · 119 HB
- T6Choose for isotropic, thermally stable properties with balanced strength and ductility; spheroidised Si eliminates build-direction anisotropy but distortion during quench must be planned for.240 MPa yield · 105 HB
- Stress RelievedStandard industrial default for dimensional stability: removes build residual stress and anisotropy at the cost of ~25 % strength, gaining ductility and thermal conductivity.215 MPa yield · 100 HB
- CAST-T6Sand/permanent-mould AlSi10Mg solution treated near 525-540 °C, quenched and peak aged for maximum strength and hardness at low ductility.215 MPa yield · 90 HB
- CAST-T64Under-aged (T64) cast AlSi10Mg: strength close to T6 with noticeably better ductility and toughness for impact-loaded castings.200 MPa yield · 80 HB
- HIPCloses gas/lack-of-fusion porosity for fatigue-critical and pressure-tight parts; coarsens the Si network so static strength drops but ductility and fatigue life rise sharply.185 MPa yield · 88 HB
- CAST-FConventionally cast (sand or permanent-mould) AlSi10Mg in the as-cast F condition: modest strength, good castability and pressure tightness.90 MPa yield · 55 HB
Working with AlSi10Mg Stress Relieved
Is AlSi10Mg easy to machine?
Machines like a hypoeutectic Al-Si casting — use polished-flute or PCD/diamond-coated carbide, high speed and low feed, flood coolant; eutectic Si is abrasive and as-built porosity can cause chatter and smeared surfaces.
Can AlSi10Mg be welded?
Weldable by TIG/laser with 4043/AlSi10 filler; keep heat input low and pre-bake parts to avoid porosity from trapped process gas, and re-age after welding since the HAZ softens.
Can AlSi10Mg be formed, bent or molded?
Not cold-formable — geometry is created by the build; design with ≥45° self-supporting angles, 0.4 mm minimum wall, and stress-relieve on the plate before support removal to prevent warping.
What surface finishes work on AlSi10Mg?
Bead-blast or tumble to even the as-built roughness (Ra 6–15 µm), machine critical faces, then hard-anodize or chromate-free conversion coat; anodized colour is dark grey and non-uniform because of the silicon.
AlSi10Mg chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Sinear-eutectic, drives fluidity and printability | 9 – 11 | 10 |
| MgMg2Si precipitation hardening | 0.2 – 0.45 | 0.35 |
| Fepowder grades usually ≤0.25 | ≤ 0.55 | 0.15 |
| Mn | ≤ 0.45 | 0.05 |
| Ti | ≤ 0.15 | 0.02 |
| Cu | ≤ 0.05 | 0.01 |
| Ni | ≤ 0.05 | 0.01 |
| Zn | ≤ 0.1 | 0.02 |
| Pb | ≤ 0.05 | 0.01 |
| Sn | ≤ 0.05 | 0.01 |
| Opowder oxygen, typical gas-atomised limit | ≤ 0.2 | 0.06 |
| Al | balance | — |
AlSi10Mg Stress Relieved — frequently asked
What is AlSi10Mg Stress Relieved used for?
AlSi10Mg Stress Relieved is typically used for brackets, heat exchangers and drone frames. In short: standard LPBF aluminum casting.
What is the yield strength of AlSi10Mg Stress Relieved?
AlSi10Mg Stress Relieved has a typical yield strength of 215 MPa (31.2 ksi) and a tensile strength of 345 MPa (50 ksi) — stronger than 57% of aluminum grades. Strength varies by condition: see the 7 listed tempers.
Is AlSi10Mg Stress Relieved easy to machine?
Reasonably — machinability is rated good (55/100, worse than 58% of aluminum grades). Machines like a hypoeutectic Al-Si casting — use polished-flute or PCD/diamond-coated carbide, high speed and low feed, flood coolant; eutectic Si is abrasive and as-built porosity can cause chatter and smeared surfaces.
Can AlSi10Mg Stress Relieved be welded?
Yes — weldability is rated good (60/100). Weldable by TIG/laser with 4043/AlSi10 filler; keep heat input low and pre-bake parts to avoid porosity from trapped process gas, and re-age after welding since the HAZ softens.
What surface finishes work on AlSi10Mg Stress Relieved?
Bead-blast or tumble to even the as-built roughness (Ra 6–15 µm), machine critical faces, then hard-anodize or chromate-free conversion coat; anodized colour is dark grey and non-uniform because of the silicon.
Can AlSi10Mg Stress Relieved be formed, bent or molded?
Not cold-formable — geometry is created by the build; design with ≥45° self-supporting angles, 0.4 mm minimum wall, and stress-relieve on the plate before support removal to prevent warping.
What is the maximum service temperature of AlSi10Mg Stress Relieved?
AlSi10Mg Stress Relieved is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between AlSi10Mg As Printed and AlSi10Mg CAST-F?
As Printed is the default condition — highest strength/hardness straight off the plate; use when residual stress and anisotropy are acceptable and parts are small or well supported. CAST-F: conventionally cast (sand or permanent-mould) AlSi10Mg in the as-cast F condition: modest strength, good castability and pressure tightness. Yield strength is 265 MPa in As Printed versus 90 MPa in CAST-F.
Can FabDigit make parts in AlSi10Mg Stress Relieved?
Yes — AlSi10Mg Stress Relieved is available for 3D printing with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- EOS Aluminium AlSi10Mg Material Data Sheet — EOS GmbH (2022)
- AlSi10Mg Material Data Sheet for SLM systems — Nikon SLM Solutions (2023)
- EN 1706 — Aluminium and aluminium alloys, castings (EN AC-43000/AlSi10Mg) — CEN (2020)
- ASTM F3318 — Additive Manufacturing of Aluminium Alloy AlSi10Mg by Laser Beam Powder Bed Fusion — ASTM International (2018)
- ASM Handbook Vol. 2 — Properties of Aluminum Alloys (A360/AlSi10Mg) — ASM International (1990)
- Senvol / published L-PBF AlSi10Mg mechanical and fatigue data compilations — various peer-reviewed sources (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.