Special features of the structure formation and properties of castable Al - Mg alloys alloyed with scandium

Abstract

Alloys of the AI -Mg system are characterized by an elevated corrosion resistance and ductility and good casting properties. The strength of these alloys depends considerably on the concentration of the main alloying element, namely, magnesium. Alloying with small amounts of transition metals, for example, Ti, Zr, Cr, Sc, affects markedly the structure and properties of AI -Mg alloys. The present work is devoted to the structure and properties ofAl -Mg alloys alloyed with scandium.Mechanical properties of hardened alloys of the AI-Mg system alloyed with Sc, Ti, Mn, Cr, and Be are presented in Table I. It can be seen that the highest strengthening is attained when the magnesium concentration in the alloy is 8%. The effect of the concentration of scandium on the mechanical properties of the AI -8% Mg alloy is presented in Fig. 1.

Al–Mg–Mn alloy coating on steel with superior corrosion behavior

“…Finally, Mn was dispersed throughout the FeAl 3 intermetallic layer. The low diffusivity of Mn in Al [38] even at higher temperature may not promote further diffusion of Mn into the more densed Fe 2 Al 5 layer. Unfortunately, no plate-like Al 6 Mn precipitate or dispersoids were observed in SEM which normally appeared during recrystallization of cast Al-Mg-Mn alloys [30].…”

Plane strain fracture toughness of scandium doped Al–6Mg alloy

“…Scandium is known to enhance solidification speed in Al-6Mg alloy [18]. Higher scandium content in alloy 3 has led to structural fineness along with diminution in second phase constituents.…”

“…Magnesium does not dissolve in Al 3 Sc [16] and therefore neither the precipitation behaviour nor the volume fraction of Al 3 Sc is influenced by the magnesium content of Al-Mg-Sc alloy [16]. On the contrary, trace scandium addition in Al-6Mg alloy leads to structural modification by way of altering solidification speed and insures homogeneous dispersed distribution of ␤-phase, which tends to improve its toughness [17][18][19]. Again solid solution hardening effect due to magnesium remains unaffected by the addition of scandium in Al-Mg alloy [16,20].…”

Al-Mg-Sc-Ti-Zr (Aluminum-Magnesium-Scandium-Titanium-Zirconium)

“…The Updates of the Al-Mg-Sc and Al-Mg-Sc-Zr systems were presented by [2007Rag] and[2008Rag], respectively. Only binary compounds appear at the Al-rich corner in the reviewed phase equilibria of these systems.…”

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A vertical section for this five-component system was determined by at 0.3Sc-0.15Ti-0.15Zr (mass%).

Lower Order SystemsThe Updates of the Al-Mg-Sc and Al-Mg-Sc-Zr systems were presented by [2007Rag] and[2008Rag], respectively. Only binary compounds appear at the Al-rich corner in the reviewed phase equilibria of these systems.

Quaternary Vertical Section

The experimental details used by are not given in their paper.

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