The Zr alloying effect on microstructure evolution and mechanical properties of nanostructured Al-Zr alloyed films

Al-Zr nanocrystalline alloy films with Zr contents range from 0 to 8.3 at.% were prepared by magnetron sputtering. The microstructure evolution, mechanical behaviors and strengthening mechanism of films were studied. All the films formed a supersaturated solid solution structure of Zr in the Al latt...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-03, Vol.858, p.157707, Article 157707
Main Authors: Ma, Bingyang, Qi, Xiaoben, Li, Rongbin, Zhang, Rulin, Shang, Hailong
Format: Article
Language:English
Subjects:
Al-Zr film
Alloying effects
Evolution
Grain boundaries
Grain refinement
Grain size
Magnetron sputtering
Mechanical properties
Microstructure
Nanoalloys
Nanocrystalline alloy
Nanocrystals
Pinning
Solid solutions
Solution strengthening
Strengthening mechanisms
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Summary:Al-Zr nanocrystalline alloy films with Zr contents range from 0 to 8.3 at.% were prepared by magnetron sputtering. The microstructure evolution, mechanical behaviors and strengthening mechanism of films were studied. All the films formed a supersaturated solid solution structure of Zr in the Al lattice. With the increasing of Zr contents, the grain size of films decreased rapidly. When the Zr content increases to 8.3 at.%, the grain size was reduced to about 20 nm. The added Zr atoms tended to segregate at grain boundaries in the Al-Zr alloy films. The hardness of the film gradually increased from 2.5 GPa of pure Al to 5.4 GPa of Al-8.3 at.% Zr film. The strengthening of Al-Zr alloy film comes from three aspects, grain refinement strengthening, solid solution strengthening and nanocrystalline solution pinning strengthening. Among the three strengthening factors of the Al-Zr alloy films, the contribution of fine grain strengthening is the largest, about 70%, followed by solid solution strengthening, 15–20%. The contribution of nanocrystalline solution pinning strengthening is the weakest, less than 10%. •All Al-Zr alloy nanocrystalline films form supersaturated solid solution of Zr in Al.•The added Zr atoms tend to segregate at grain boundaries in the Al-Zr alloy films.•3.The strengthening of Al-Zr alloy film comes from three aspects.•The roles and proportions of these three strengthening factors was revealed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.157707