Metals & alloys · Aluminium alloys
AlSi7Mg casting alloy
A hypoeutectic aluminium–silicon–magnesium casting family combining castability, low density and precipitation-hardening response.
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01
Overview
- Material class
- Metals & alloys
- Category
- Aluminium alloys
- Family
- Aluminium Alloy
- Product forms
- Casting, Powder/feedstock
Composition
| Constituent | Min | Max | Typical | Note |
|---|---|---|---|---|
| Si | 6.5 | 7.5 | 7 | |
| Mg | 0.25 | 0.45 | 0.35 | |
| Fe | 0.55 | 0.15 | ||
| Cu | 0.1 | 0.05 | ||
| Mn | 0.55 | 0.1 | ||
| Ti | 0.25 | 0.12 | ||
| Al | Balance |
02
Properties and conditions
Engineering properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density | 2.68 | g/cm³ | Representative; verify product form and condition |
| Elastic modulus | 70–75 | GPa | Representative; verify product form and condition |
| Thermal conductivity | 140–170 | W/m·K | condition dependent |
| Yield strength | 120–240 | MPa | as-cast to T6 range |
| Tensile strength | 200–320 | MPa | process and heat-treatment dependent |
| Elongation | 2–12 | % | defect and condition dependent |
Conditions
Representative supplied condition
Condition not fully specified in the source record.
03
Processing and use
Processing
- Hydrogen, oxide films, porosity and modification practice strongly influence ductility.
- T6 treatment improves strength but may expose distortion or blistering risks.
Applications
- Structural castings
- Automotive housings
- Aerospace brackets
- Additive-manufactured components
Selection considerations
- Casting quality and defect population can dominate nominal alloy properties.
- Specify process route and heat-treatment condition with the grade.
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04
Standards and related materials
Standards and designations
| System | Designation | Note |
|---|---|---|
| EN | EN AC-42100 / AlSi7Mg0.3 | representative family |
| ISO | AlSi7Mg | |
| ASTM | A356-type near equivalent | not identical; verify chemistry |
05
Sources and context
Sources
- COST 507 light-alloy thermodynamic coverageExisting reference
- IMMES Simulation Lab nominal chemistryExisting reference
- NASA materials selection resourcesApplication reference
- U.S. Department of Energy lightweight materials programApplication reference
- Federal Highway Administration materials resourcesApplication reference
Confirm the applicable specification, product form and condition before using values for design or procurement.
Supply and sustainability
Available as foundry ingot and powder variants; chemistry and impurity limits differ by route.
Casting scrap is highly recyclable, but iron buildup and melt cleanliness must be managed.
Strategic context
Established engineering material with documented processing–performance relationships.