Influence of minor Zn additions on grain boundary anelasticity, grain boundary sliding, and superplasticity of Al-Mg-based alloys

Mikhaylovskaya, A. V.; Yakovtseva, O. A.; Mochugovskiy, A.G.; Cifré, J.; Golovin, I.S.

doi:10.1016/j.jallcom.2022.166785

Cited by 20 publications

(1 citation statement)

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“…Al-6%Mg alloys are doped with scandium and zirconium to increase strength, ductility, corrosion resistance, and weldability . Some commercial and novel Al-Mg-(Sc,Zr) alloys shows higher superplastic characteristics [36,[39][40][41][42][43][44][45][46][47][48][49][50][51][52]. Industrial Al-6%Mg-(Sc,Zr) alloys enjoy an optimal combination of performance characteristics but their active commercialization is constrained by high prices for scandium and Sc-doped alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sc:Zr Ratio on Superplastic Behavior of Ultrafine-grained Al-6%Mg-Sc-Zr Alloys

Чувильдеев¹,

Gryaznov²,

Shotin³

et al. 2022

Preprint

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Al-6%Mg-Sc-Zr alloys with the total ratio of Sc + Zr = 0.32 wt.% make up the target of this research. The content of scandium and zirconium varied with an increment of 0.02%. The alloys were produced by induction casting. Their ultrafine-grained (UFG) microstructure was formed with Equal Channel Angular Pressing (ECAP). Such cast alloys have a homogeneous macrostructure formed by small equiaxed grains in the central part of the ingot and columnar crystals along the edges of the cross section. After ECAP, the average grain size in the alloy specimens is 0.5–1 µm. The average grain size does not depend on the ratio of Sc and Zr in these alloys. Superplasticity tests were performed at temperatures ranging from 300 to 500 °C and at a strain rate varying between 3.3·10-3 and 3.3·10-1 s-1. UFG Al-6%Mg-0.20%Sc-0.12%Zr and Al-6%Mg-0.18%Sc-0.14%Zr alloys exhibit the highest superplasticity. It was suggested that changes in Sc:Zr ratio affect spatial distribution and composition of the following precipitating particles: Al3Sc, Al3Zr, Al3(ScxZr1-x). An increase in Zr concentration is shown to reduce the susceptibility of UFG alloys to cavitation fracture.

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