Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

V. N. Chuvil’deev
,
M. Yu. Gryaznov
,
S. V. Shotin
,
A. V. Nokhrin
* ORCID logo ,
C. V. Likhnitskii
,
G. S. Nagicheva
,
M. K. Chegurov
,
V. I. Kopylov
ORCID logo ,
O. P. Pirozhnikova
,
A. A. Bobrov
Version 1 : Received: 14 December 2022 / Approved: 20 December 2022 / Online: 20 December 2022 (04:35:58 CET)

How to cite: Chuvil’deev, V.N.; Gryaznov, M.Y.; Shotin, S.V.; Nokhrin, A.V.; Likhnitskii, C.V.; Nagicheva, G.S.; Chegurov, M.K.; Kopylov, V.I.; Pirozhnikova, O.P.; Bobrov, A.A. Effect of Sc:Zr Ratio on Superplastic Behavior of Ultrafine-grained Al-6%Mg-Sc-Zr Alloys. Preprints 2022, 2022120355. https://doi.org/10.20944/preprints202212.0355.v1 Chuvil’deev, V.N.; Gryaznov, M.Y.; Shotin, S.V.; Nokhrin, A.V.; Likhnitskii, C.V.; Nagicheva, G.S.; Chegurov, M.K.; Kopylov, V.I.; Pirozhnikova, O.P.; Bobrov, A.A. Effect of Sc:Zr Ratio on Superplastic Behavior of Ultrafine-grained Al-6%Mg-Sc-Zr Alloys. Preprints 2022, 2022120355. https://doi.org/10.20944/preprints202212.0355.v1

Abstract

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.

Keywords

aluminum alloy; ultrafine-grained microstructure; superplasticity; dynamic grain growth; cavitation fracture

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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