Effects of Scandium on Corrosion Resistance and Mechanical Properties of Cellular Al-Based Foams

Huang, Li; Yang, Dong; Wang, Hui; Ye, Feng; Lu, Z. P.

doi:10.4028/www.scientific.net/msf.747-748.93

Cited by 4 publications

(3 citation statements)

References 16 publications

(22 reference statements)

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“…The Al-Mg-RE foams have shown the best corrosion resistance properties due to the excellent corrosion resistance of Al-Mg-RE alloy. Our research [7] also demonstrates that the mass loss of cellular Al-0.41Sc foams is greater than the cellular Al foam caused by the primary Al 3 Sc phase which has a negative influence on the corrosion resistance of cellular Al-based foams. However, up to now, a study on the corrosion behavior of Al-based foams is still very limited.…”

Section: Introductionmentioning

confidence: 56%

“…Our earlier work illustrates that the Al-0.41Sc foam exhibits a worse corrosion resistance than Al foams caused by the primary Al 3 (Sc,Ti) which leading to the possible initiation sites in the process of pitting corrosion [7]. Therefore, it can be suggested that together with suitable heat treatment, the small amount of Sc and Zr additions in Al foams without formation of primary Al 3 (Sc,Zr) particles can significantly improve the corrosion resistance of the Al-based foams.…”

Section: Discussionmentioning

confidence: 91%

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Mechanical Properties and Corrosion Behavior of Cellular Al-Sc-Zr Foams

Huang¹,

Luo²,

Fan³

et al. 2015

Proceedings of the 2015 International Conference on Structural, Mechanical and Material Engineering

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Abstract-By using Ca particles as thickening agent and titanium hydride as blowing agent Cellular Al-0.16Sc-0.08Zr foams with a porosity of 72.5±0.5% were successfully fabricated by the melt-foaming method Isochronal aging treatments are beneficial to improve the mechanical properties and corrosion resistance significantly. Observation on the cell wall microstructure at 400℃ confirms the precipitation of nano-size Al 3 (Sc,Zr) particles that are coherent with Al matrix with an average radius of 4.1 nm. This suggests that these Al 3 (Sc,Zr) particles can inhibit the grain boundary sliding and dislocation movement, thus, strengthening the cell walls and increasing the compressive strength of the foams. In addition, the Sc 2 O 3 protective film over the detective surface improves the corrosion resistance of the aged Al-0.16Sc-0.08Zr foam.

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Section: Introductionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 91%

Mechanical Properties and Corrosion Behavior of Cellular Al-Sc-Zr Foams

Huang¹,

Luo²,

Fan³

et al. 2015

Proceedings of the 2015 International Conference on Structural, Mechanical and Material Engineering

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“…Therefore, it is the case that alloying followed by an appropriate heat treatment is one of competitive ways to enhance the mechanical properties of Al-based foams [ 5 , 12 , 13 , 14 ]. Previous results showed that additions of a small amount of Sc can lead to remarkable improvements in the mechanical properties [ 15 , 16 , 17 , 18 ], and such improvements are normally attributed to the precipitation hardening of the Al 3 Sc phase formed during aging after solution heat treatments [ 19 ]. It was found that Sc additions have a major impact on strengthening, as they form a fine distribution of spherical L1 2 dispersoids.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous Age-hardening of Large-sized Al-Sc Foams via Micro-alloying with Zr and Ti

Chu,

Wang,

Yang

et al. 2024

Materials

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Al-based foams have drawn increasing attention from industry due to their integration of structure and functional properties. However, large-sized Al-based foams still cannot be homogeneously strengthened by long-time aging due to their low thermal conductivity. In this study, we proposed an age-hardening approach that was applied in large-sized Al-0.16Sc-0.17Zr (wt.%) foams via micro-alloying with Zr and Ti compared with Al-0.21Sc foams; it not only achieved homogeneous strength by long-term aging but also reduced the cost of the alloy by substituting Zr and Ti for the more expensive Sc content. The results show that the Al3(Sc, Zr, Ti) phase with a core–shell structure as a crucial precipitation strengthening phase by micro-alloying with Zr and Ti was less prone to coarsening after a prolonged aging heat treatment. Therefore, the yielding strength of Al-Sc foam micro-alloying with Zr and Ti remained almost unchanged after a maximum aging time of 1440 h due to less coarsening precipitate, which is consistent with the results of mechanical experiments. These findings provide a new way for the heat treatment strengthening of large-sized Al-based foams, thus promoting their industrial applications.

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