The Effect of Transition Elements on High‐Temperature Mechanical Properties of Al–Si Foundry Alloys–A Review

Abstract

The high temperature mechanical performance of Al-Si alloys can be enhanced by alloying with transition metals, induced by the formation of thermally stable and coarsening resistant precipitates in the microstructure. However, the binary dispersoids such as Al 3 Zr can be less effective due to limitations encountered during conventional manufacturing processes. Further improvements can be achieved through the transformation of these binary trialuminides into ternary or quaternary forms by alloying with appropriate elements. The role of transition elements in improving high temperature mechanical properties of Al-Si alloys from both theoretical and practical viewpoints is critically reviewed.

Mechanical properties enhancement of cast Al-8.5Fe-1.3V-1.7Si (FVS0812) alloy by friction stir processing

“…Due to their high specific strength, excellent castability, good weldability, and high corrosion resistance, commercial Al alloys have been extensively employed in different industrial fields such as automotive, aerospace, and aviation [1]. However, owing to dissolution and/or coarsening of the strengthening precipitates and/or growth of grains, their application is usually limited to the temperatures below 150 °C [2,3]. Therefore, to increase the service temperature of Al alloys, transition metals such as Fe, Ni, and V are added to their composition.…”

Characterization of Al-Si-Ni Ternary Alloy Synthesis From Reduction of Sodium-Fluosilicate and Nickel Oxide

“…The transition elements forming thermodynamically stable trialuminides intermetallics are e.g. Sc, Y, Ti, Zr [14].…”

Effect of Co and Ni Addition on the Microstructure and Mechanical Properties at Room and Elevated Temperature of an Al–7%Si Alloy

“…1 Weight reduction in the automotive industry is also important because of the increased weight of safety systems, luxury and comfort items that are required by the customers. 2 Al-Si alloys are the most widely used aluminium alloys in the foundry industry because of their good fluidity, excellent castability, high strength-to-weight ratio, good corrosion resistance and good wear properties. 3 However, the use of cast Al-Si alloys at temperatures exceeding 200°C is challenging because of the significant reduction in the mechanical properties at elevated temperature.…”

“…3 However, the use of cast Al-Si alloys at temperatures exceeding 200°C is challenging because of the significant reduction in the mechanical properties at elevated temperature. 2,4 Therefore, researchers have focused significant efforts into improving the mechanical properties of Al-Si alloys at elevated temperatures through tailoring microstructure and alloy composition, and addition of transition elements has been shown to promote thermally stable phases. 2,[4][5][6][7] Both Co and Ni have high melting points and are well known as superalloys for high-temperature applications.…”

“…2,4 Therefore, researchers have focused significant efforts into improving the mechanical properties of Al-Si alloys at elevated temperatures through tailoring microstructure and alloy composition, and addition of transition elements has been shown to promote thermally stable phases. 2,[4][5][6][7] Both Co and Ni have high melting points and are well known as superalloys for high-temperature applications. 8,9 Limited studies have been carried out on the combined effects of Co and Ni in Al-Si alloys.…”