Aluminium–silicon alloys: Difference between revisions
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==Characteristics== |
==Characteristics== |
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* High cast ability, [[fluidity]], corrosion resistance, ductility, and low specific gravity |
* High cast ability, [[fluidity]], corrosion resistance, ductility, and low specific gravity. |
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* Used for large castings, which are made to operate under heavy load conditions |
* Used for large castings, which are made to operate under heavy load conditions. |
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* Under the category of non-heat-treatable alloys but can be modified by the addition of Mg & Cu, which enables it to be heat treated, e.g. AΠ4 alloys |
* Under the category of non-heat-treatable alloys but can be modified by the addition of Mg & Cu, which enables it to be heat treated, e.g. AΠ4 alloys. |
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* Strengthened by solution treatment, e.g. adding 0.01% sodium (in the form of sodium fluoride [NaF] and sodium chloride [NaCl]) to the melt just before casting |
* Strengthened by solution treatment, e.g. adding 0.01% sodium (in the form of sodium fluoride [NaF] and sodium chloride [NaCl]) to the melt just before casting. |
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* Disadvantage is the presence of porosity in the cast (i.e. the cast can become foam-like), which can be avoided by casting under pressure in autoclaves |
* Disadvantage is the presence of porosity in the cast (i.e. the cast can become foam-like), which can be avoided by casting under pressure in autoclaves. |
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==References== |
==References== |
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Revision as of 11:26, 29 July 2016
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Silumin is the general term used for a group of casting alloys based on an aluminum–silicon system. It is made up of a series of lightweight, high-strength aluminum alloys containing 3 to 50 percent silicon content.[1] Casting is the primary use of aluminum-silicon alloys, but they can also be utilized in rapid solidification processes and powder metallurgy. Within the Aluminum Association designation system, silumin correspond to alloys of two systems: 3xxx, aluminum–silicon alloys also containing magnesium and/or copper, and 4xx.x – Binary aluminum–silicon alloys. Silumin has a high resistance to corrosion, making it useful in humid environments. The addition of silicon to aluminum also makes it less viscous when liquid, which, together with its low cost (both component elements are relatively cheap to extract), makes it a very good casting alloy and a fresher metal.[2] It is also used on 3 phase motors to allow speed regulation. Silumin is also commonly used in the manufacturing of rifle scope and camera mounts.
Characteristics
- High cast ability, fluidity, corrosion resistance, ductility, and low specific gravity.
- Used for large castings, which are made to operate under heavy load conditions.
- Under the category of non-heat-treatable alloys but can be modified by the addition of Mg & Cu, which enables it to be heat treated, e.g. AΠ4 alloys.
- Strengthened by solution treatment, e.g. adding 0.01% sodium (in the form of sodium fluoride [NaF] and sodium chloride [NaCl]) to the melt just before casting.
- Disadvantage is the presence of porosity in the cast (i.e. the cast can become foam-like), which can be avoided by casting under pressure in autoclaves.
References
- ^ "Aluminum-Silicon Alloys". Key To Metals. Retrieved 18 April 2012.
- ^ Pezdn, J (2008). "Effect of modification with strontium on machinability of AK9 silumin" (PDF). Polish Academy of Sciences. Retrieved 13 March 2013.
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