AlSi10Mg

metal

aluminium-silicon alloy (cast grade adapted for AM)

EN AC-43000EN 1706 AlSi10MgA360 (cast equiv.)Aluminium Silicon 10% MagnesiumAl-10Si-0.3Mg

Density

2.67 g/cm³

YS (LPBF as-built (XY))

210–270 MPa

UTS (LPBF as-built (XY))

320–400 MPa

Elongation (LPBF as-built (XY))

2.0–7.0 %

Elastic modulus

65–75 GPa

Thermal conductivity

100.0–150.0 W/m·K

Composition — EN AC-43000 / AMS 7047

Element	Min %	Max %	Notes
Al	bal.		balance
Si	9.00	11.000	Near-eutectic — promotes low shrinkage and good LPBF processability
Mg	0.20	0.450	Precipitation hardening agent — forms Mg₂Si on ageing
Fe	—	0.550
Cu	—	0.050	Low Cu maintained to preserve corrosion resistance and weldability
Mn

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Mechanical & thermal properties — 4 conditions

Property	LPBF as-built (XY)	LPBF as-built (Z)	LPBF stress-relieved 300°C (XY)	LPBF T6 heat-treated (XY)
Elastic modulus	65–75 GPa	—	—	—
Yield strength (0.2%)	210–270 MPa	170–230 MPa	200–255 MPa	165–215 MPa
Ultimate tensile strength	320–400 MPa	270–360 MPa	300–375 MPa	240–310 MPa
Elongation at break	2.0–7.0 %	1.0–5.0 %	3.0–8.0 %	6.0–13.0 %
Hardness (HV)	110–150 HV10	105–140 HV10	—	85–115 HV10
Fatigue strength	70–120 MPa	—	—	100–160 MPa
Density	2.67 g/cm³	—	—	—
Thermal conductivity	100.0–150.0 W/m·K	—	—	145.0–165.0 W/m·K
Specific heat	900 J/(kg·K)	—	—	—
CTE	20.0–22.0 µm/m·K	—	—	—
As-built surface Ra	7.0–18.0 µm	—	—	—

Values shown as min–max where a spread is reported, otherwise as typical ± unit. Ranges reflect inter-source variation, not single-sample scatter. All values are for AM-processed specimens unless noted.

Engineering considerations

Always declare post-condition: as-built, stress-relieved (300°C), or T6. As-built and T6 have ~25% different YS — this is not a minor detail.
T6 temperature is critical: solution anneal below 510°C is incomplete; above 540°C causes incipient melting. Use a calibrated atmosphere furnace.
Anisotropy in as-built is significant (XY ≫ Z). For thin brackets loaded in the Z direction, T6 post-processing is recommended to equalise properties.
Laser reflectivity: LPBF requires ~175–350 W laser power for AlSi10Mg, higher than steel due to high Al reflectivity at Nd:YAG wavelength. Green laser (515 nm) LPBF systems offer improved coupling.
Build plate adhesion: AlSi10Mg typically requires 150–200°C plate preheat and steel base plate with roughened surface (Ra ~3 µm) to prevent delamination.
Support structures: Al is soft and supports are easy to remove, but remelting at interfaces creates HAZ and potential LOF — minimise internal support contact area.
Powder storage: aluminium powder is highly reactive with moisture. Use sealed inert containers; monitor O and H content before each build. ATEX explosive atmosphere precautions mandatory.
Thermal conductivity application note: T6 heat-treated AlSi10Mg has ~20% higher thermal conductivity than as-built — specify T6 for heat sinks to maximise performance.
Comparison to Scalmalloy: if operating temperature exceeds 100°C or strength >400 MPa is required, consider Scalmalloy (Al-Mg-Sc) — significantly higher cost but much better elevated-temperature retention.

Advantages

Lowest density of commercial LPBF metals (~2.67 g/cm³) — best specific strength for lightweight applications
As-built LPBF strength exceeds cast equivalent — ultra-fine Al-Si eutectic provides Hall-Petch-type strengthening
High thermal conductivity (130–155 W/m·K) — excellent for heat sink and thermal management applications
T6 heat treatment produces near-isotropic, ductile properties — reduces build direction sensitivity
Well-established EOS, Renishaw, Trumpf, SLM parameter sets — shortest qualification path of AM aluminium alloys
Electrical conductivity ~25% IACS — suitable for lightweight electrical hardware
Good corrosion resistance in marine and mild industrial environments
Weldable — allows post-AM hybrid fabrication

Limitations

As-built ductility is low (2–7%) — unsuitable for crash energy absorption without T6 treatment
T6 heat treatment substantially reduces yield strength (~240 → 190 MPa) — strength advantage over cast partly negated
Poor elevated-temperature strength — not suitable above 150°C without alloy redesign (see Scalmalloy for high-temp Al AM)
No precipitation hardening without Mg — cannot reach 7075 or 2024 strength levels; those alloys are much harder to print
Laser reflectivity of aluminium (~91% at 1064 nm Yb:YAG) requires high-power laser and careful parameter optimisation to avoid porosity
Hydrogen porosity risk — must carefully control powder moisture content; Al-H system has high hydrogen solubility in melt
Limited fatigue endurance in as-built condition — surface finish critical; fatigue-critical parts need machining + optional shot-peening
Z-direction ductility can drop below 2% — orient primary load axis in XY for ductility-critical applications

Typical applications

Lightweight structural brackets and frames (aerospace, automotive)Heat sinks and thermal management components (electronics cooling)Engine and powertrain housingsJigs, fixtures, and tooling insertsUnmanned aerial vehicle (UAV) structural framesThin-wall pressure housings and enclosuresMotorsport suspension and body componentsMedical device housings and instrument handlesHydraulic manifolds and fluid distribution blocksConsumer electronics structural components

Standards & certifications

AMS-7047established

AlSi10Mg LPBF parts for aerospace structural applications — composition, powder spec, and minimum tensile properties

aerospacedefence

As-built and T6 condition requirements. Required by select aerospace OEMs for Al LPBF parts.

ASTM-E8established

Tensile test method — required for acceptance testing of AM AlSi10Mg

aerospaceautomotiveindustrial

ASTM-E466established

Fatigue testing for rotating and cyclic-load applications

aerospaceautomotivemotorsport

ISO-52904established

Process quality assurance for safety-critical PBF parts

aerospacemedicaldefence

Last reviewed: 2026-05-04 · v1 · Sources: AMS-7047, eos-alsi10mg-2023, renishaw-alsi10mg-2023, brandl-2012-alsi10mg, kempen-2012-alsi10mg, tradowsky-2016-alsi10mg, debroy-2018-review, yadollahi-2017-fatigue, ASTM-E8, ASTM-E466

AlSi10Mg

Composition — EN AC-43000 / AMS 7047

Mechanical & thermal properties — 4 conditions

Engineering considerations

Advantages

Limitations

Typical applications

Industries

Standards & certifications

Compatible AM processes (2)

Other metal materials

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