Rapid Solidification Processing: Melt Spinning of Al-High Si Alloys

Abstract

Rapid solidification processing is a technique used for refining the primary silicon and seems to be the most promising technique for the production of high Si Al-Si alloys (i.e. Si content greater than 17 wt.%). There are number of routes which can be used to produce rapid solidification, including spray methods, weld methods, and chill methods. Of these, melt spinning is the most widely used industrially due to its high cooling rate and the ability to process large volumes of materials. This paper summarizes melt spinning and rapid solidification, highlighting a potential production route for aluminium-high silicon alloys involving melt spinning followed by hot isostatic processing.

Selective laser melting of hypereutectic Al-Si40-powder using ultra-short laser pulses

“…At a mass fraction of 40 % silicon the liquidus temperature is 350 K above the eutectic temperature [7]. Up to now only a few methods such as spray deposition and melt spinning allow a rapid cooling that is suitable to achieve a desired fine distribution of silicon particles in an aluminium matrix [9][10][11][12]. However, these techniques only allow the fabrication of semi-finished products without complex designed structures.…”

Microstructure, Phase Composition, Mechanical Properties and Tribological Properties of Plasma Sprayed Al-25Si Wear-Resistant Coatings

“…Compared with conventionally cast high-silicon aluminum alloys, the rapid solidification techniques, such as Melt Quenching (MQ) [22], Rapid Solidification-Powder Metallurgy (RS-PM) [23], Spray Forming (SF) [24], and Selective Laser Melting, SLM (SLM) [25], could generate fine-grained spherical silicon particles, greatly enhancing the mechanical properties of the alloy. Among them, the supersonic plasma spraying (SAPS) could instantly melt the Al-Si particles with a temperature of 10,000 • C. Subsequently, it only takes 0.2 µs for the particles from the melting to the deposition and solidification on the substrate with a cooling rate as high as 10 8 K/s.…”

Microstructural Characterization and Mechanical Properties of Rapidly Solidified Al-Si Systems by Chill Block Melt-Spinning Technique.

“……………………. (6) At which, (d) is represented as the ribbon's thickness for Al‫ــ‬ pure and Al‫ــ‬Six (where x= 1, 5, 9 and 13 wt. %), melt‫ـــ‬spun samples, we noticed that the thermal diffusivity has a higher value in Al‫1ــ‬Si sample than Al‫ــ‬ pure and Al‫ــ‬Six (where x= 5, 9 and 1 3 wt.…”

“…Nowadays Aluminum alloys or other lightweight alloys have a lot of application in manufacturing industries and automotive industries, as they augment the engine efficiency because they have the ability to reduce weight along with it can retain the strength that is desired to resist the same strength of cast iron. These lightweig ht alloys also decrease the consumption of shields the surroundings and fuel, so steel parts and cast iron can replaced by it successfully [6][7][8]. The development of aluminum base alloys which have important features such as low weight, high stiffness and high tensile strength have extensively been required because of its expectation of the improvement of structural efficiency to reduce fuel consumption and transportation vehicle.…”