AlSi7Mg Aluminum Alloy Powder
Aluminum Alloy Powders · Metal Additive Manufacturing Powder
AlSi7Mg (F357 / A357 family) is the aerospace-grade aluminum alloy of additive manufacturing, specified for structural casting-equivalent parts where weldability and damage tolerance matter. With 7% silicon and 0.4-0.7% magnesium, it offers slightly lower strength than AlSi10Mg as-built, but heat treatment (T6) develops higher elongation and fatigue performance, matching A357 investment-casting properties. Published LPBF data show as-built AlSi7Mg at 352 MPa UTS and 232 MPa YS with 9% elongation; T6 heat treatment brings tensile properties to aerospace specification levels. 20-63 µm gas-atomized powder is the standard cut. For aerospace buyers, suppliers with aerospace process control documentation (powder chemistry per AMS 4289, batch traceability, reduced porosity via HIP) should be prioritized.
Typical Applications
AlSi7Mg Aluminum Alloy Powder - Key Properties
| Chemical composition (wt%) | Al bal · Si 6.5-7.5 · Mg 0.4-0.7 · Fe ≤0.15 · Ti 0.04-0.2 |
| Density | 2.68 g/cm³ (bulk) |
| Tensile strength (as-built) | 352 MPa UTS · 232 MPa YS (median of 12 data points) |
| Elongation (as-built) | 9% (median of 12 data points) |
| Hardness | ~107 HV (as-built) |
| Particle size | 20-63 µm (standard) · 15-45 µm |
| Production | Gas atomization — aerospace-controlled lots |
| Standards | AMS 4289 · EN AC-42200 · A357 equivalent |
2 product offer(s) — 2 supplier(s)
Frequently Asked Questions
How much does AlSi7Mg powder cost?
AlSi7Mg typically quotes $55-100 per kg, a premium over AlSi10Mg for its aerospace pedigree. Get current supplier quotes on this page — responses within 24 hours.
Why choose AlSi7Mg instead of AlSi10Mg?
AlSi7Mg offers superior weldability, lower porosity sensitivity and better fatigue behavior after T6 heat treatment — preferred for aerospace structural parts, while AlSi10Mg favors general lightweight production.
What is the recommended heat treatment for AlSi7Mg?
T6: solution treatment at ~540°C, quench, then artificial ageing at ~160°C for 4-12 hours. This develops the strength/elongation balance specified in AMS 4289.
Is HIP required for AlSi7Mg aerospace parts?
For flight-critical parts, hot isostatic pressing after printing closes residual porosity and is a common requirement in aerospace qualification programs. Discuss the full post-processing route with your supplier.
Which particle size should I order?
20-63 µm for standard LPBF productivity, 15-45 µm for fine features. Specify your machine model and layer thickness in the inquiry.
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