Effect of rare earth Y and Al–Ti–B master alloy on the microstructure and mechanical properties of 6063 aluminum alloy

Coupled segregation mechanisms of Sc, Zr and Mn at θ′ interfaces enhances the strength and thermal stability of Al-Cu alloys

Precipitation sequence in Al–Mg–Si–Sc–Zr alloys during isochronal aging

Microalloying Al alloys with Sc: a review

Assembling dual precipitates to improve high-temperature resistance of multi-microalloyed Al–Cu alloys

Micro-segregation and precipitates in as-solidified Al-Sc-Zr-(Mg)-(Si)-(Cu) alloys

The hot deformation behaviour of two model Al–Mg–Si alloys was assessed. One alloy was representative of the 6xxx series containing small additions of Mn and Cr, while the other contained small additions of Sc and Zr. Prior to deformation, a multi-stage heat treatment was conducted on the alloys to solutionize the Mg and Si and promote the precipitation of Al3(Sc,Zr) dispersoids in the Al–Mg–Si-Sc-Zr alloy. Uniaxial hot compression tests were conducted at various temperatures (683–823 K) and strain rates (1–125 s−1) and the resulting flow stress-strain curves were evaluated. Flow stress values were observed to be slightly increased in the alloy containing Sc and Zr. The activation energy for hot deformation and material constants for each alloy were calculated, which in turn provided a good prediction of the experimental data. The post-deformation microstructures were analysed using SEM and TEM. The capacity for dynamic recovery was reduced, while dynamic recrystallization was prevented in the Al–Mg–Si-Sc-Zr alloy. This was a result of restricted dislocation motion, caused by the pinning of dislocations from the Al3(Sc,Zr) dispersoids. The relative flow stress of the Al–Mg–Si-Sc-Zr alloy was found to compare favourably to other 6xxx series alloys with similar mechanical properties.

Steven Babaniaris

Papers

Micro-segregation and precipitates in as-solidified Al-Sc-Zr-(Mg)-(Si)-(Cu) alloys

Precipitation sequence in Al–Mg–Si–Sc–Zr alloys during isochronal aging

Effect of Al3(Sc,Zr) dispersoids on the hot deformation behaviour of 6xxx-series alloys: A physically based constitutive model

Tailored precipitation route for the effective utilisation of Sc and Zr in an Al-Mg-Si alloy

Stability and stoichiometry of L12 Al3(Sc,Zr) dispersoids in Al-(Si)-Sc-Zr alloys