Variation of microstructure of RE-containing AlSi20Cu2Ni1RE0.6 alloy with different cobalt contents

Effect of Co on Si and Fe-containing intermetallic compounds (IMCs) in Al–20Si–5Fe alloys

“…5(b)-(d) that the combined effects of Co addition and rapid solidification have totally changed the morphology of the microstructure of melt-spun Al-20Si-5Fe alloy, meaning Co had great effect on both Si phases and Fe-containing intermetallics in meltspun Al-Si alloys. Whereas, Sha et al [16] investigated the effect of Co on cast Al20Si2CuNi0 Á 6RE alloy, where they stated that Co had no effect on Si phases. The effect of Co in our case could be attributed to the fact that the modifier agents are more effective at higher freezing rates [21].…”

“…Among the transition metals used as modifiers/neutralizer in iron containing Al-Si alloys, Co is not a common addition to aluminum alloys, and there are only a few standards of aluminum alloys that contain Co [15,16]. And the effect of Co with different amounts on the microstructure and mechanical properties of Al20Si alloy containing 5 wt% Fe has been rarely reported.…”

Effects of melt thermal rate treatment and modification of P and RE on hypereutectic Al–Si–Cu–Mg alloy

“…Hypereutectic Al-Si alloy is used extensively in various product applications requiring high strength/weight ratios, as well as for superior corrosion resistance, wear resistance, machinability, castability and thermal expansion coefficient, especially in aerospace and automotive industries. [1][2][3] Copper and magnesium are usually added to improve the strength and other properties of Al-Si foundry alloys. Owing to their excellent comprehensive properties, Al-Si-Cu-Mg cast aluminium alloys have wide application and have become one of the most important structural materials in the equipment manufacturing industry, such as A390 and Al-18Si-1?3-1?5Cu-0?3-0?5Mg (in China).…”

“…Hypereutectic Al–Si alloy is used extensively in various product applications requiring high strength/weight ratios, as well as for superior corrosion resistance, wear resistance, machinability, castability and thermal expansion coefficient, especially in aerospace and automotive industries 1 – 3. Copper and magnesium are usually added to improve the strength and other properties of Al–Si foundry alloys.…”

Isothermal section of the Al–Dy–Zr ternary system at 773 K

“…The microstructure and properties of them can be strongly affected by adding small amounts of transition elements such as Zr, Mn and Cr, etc. [4][5][6]. As a very important alloying element, Zr optimizes various aspects of Al alloys like refining grains, inhibiting re-crystallization and improving stress corrosion cracking resistance [7,8].…”