The Mechanical Performance of Aluminum Foam Fabricated by Melt Processing with Different Foaming Agents: A Comparative Analysis

Byakova, A. V.; Gnyloskurenko, Svyatoslav; Vlasov, A. O.; Yevych, Yan; Semenov, N. V.

doi:10.3390/met12081384

Cited by 9 publications

(7 citation statements)

References 28 publications

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“…AFS panels consisting of AlSi 12 foam and 6063Al alloy cover sheets were fabricated by melt foaming and hot rolling. Compared with other preparation methods, it not only reduces the cost of raw materials, but also reduces the need for machining capacity [46][47][48]. It has great prospects for industrialization and application.…”

Section: Discussionmentioning

confidence: 99%

Pore Structure and Deformation Correlation of an Aluminum Foam Sandwich Subject to Three-Point Bending

Lu,

Jing,

Zhou

et al. 2024

Materials

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An Al-Si matrix foam sandwich (AFS) with 6063 Al alloy cover sheets was fabricated by hot rolling combined with melt foaming. A foamable AlSiMg1/SiCp matrix precursor was prepared by the melting route. Hot rolling at 480 °C was carried out to obtain a mechanical bonding interface between the cover sheet and the foamable precursor. Meanwhile, the pore structure of the AFS was deeply affected by the foaming temperature and foaming time during the foaming process. Different pore growth mechanics of the crack-like pore disappearance mechanism (CDM) and pore active expansion mechanism (AEM) were concluded based on the pressure difference in pores inside and outside. Three bending tests were applied to three types of AFSs with different pore structures to evaluate the relation between pore structures and AFS mechanical properties. The bending property of the AFS with fewer layers of pores is like that of a dense material. The bending property of the AFS with a pore size in the range of 0~1 mm presents a typical sandwich shear failure mode. The AFS with a uniform pore structure, in which the shapes of the pores are predominately polygons and the pore diameter is concentrated in the range of 0.5~3 mm, processes a good energy absorption capacity, and the bending stress–strain curve fluctuates greatly after the first stress drop.

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Section: Discussionmentioning

confidence: 99%

Pore Structure and Deformation Correlation of an Aluminum Foam Sandwich Subject to Three-Point Bending

Lu,

Jing,

Zhou

et al. 2024

Materials

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“…A melt-foaming method initially based on the ALPORAS © route was applied to fabricate the cellular Al-0.16Sc-0.17Zr (wt.%) foam samples (Al alloy containing 0.16 wt.% Sc and 0.17 wt.% Zr) with a porosity of ~78% [ 22 ]. The specific preparation procedure was elaborated in detail previously [ 23 , 24 ], which can be summarized as follows. A predetermined quantity of Al-0.16Sc-0.17Zr alloy (~1 kg) was melted in a crucible at a fixed temperature and then 2.0 wt.% Ca was introduced into the molten alloy to increase the viscosity of the melt.…”

Section: Methodsmentioning

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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“…Such comparisons for Al foam and A356 alloy foam are shown in Figure 7a,b. The linear dependences are based on our data [17], and the points are the data of other authors [7,19,[21][22][23][24][25][26]. It can be seen that there is a difference in the magnitude of σ pl .…”

Section: Mechanical Characterizationmentioning

confidence: 95%

“…Figure 7. Comparison of plateau stress 𝜎 pl from the authors' results[17] and those of other authors for (a) Al foam[17] and[19,21,7,26], (b) A356 alloy foam[17] and[22][23][24][25] …”

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confidence: 99%

Al and A356 Alloy Foam Castings Modified with Low Concentrations of Nano-Sized Particles: Structural Study and Compressive Strength Tests

Dimitrova,

Simeonova,

Krastev

et al. 2024

Metals

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Aluminum and A356 alloy foam castings are produced using a melt-foaming method. Prior to foaming, the melt is modified with nano-sized particles (SiC, TiN, or Al2O3). The nano-sized particles are mixed with micro-sized Al particles, which are ultrasonically treated and hot-extruded. Thus, the so-called “modifying nano-composition” is obtained. The resulting compositions are introduced into the melt of the Al foam at the following mass concentrations of nanoparticles: SiC: 0.038 wt. %; TiN: 0.045 wt. %; and Al2O3: 0.046 wt. %. For the A356 foam, we use the following concentrations: SiC: 0.039 wt. %; TiN: 0.052 wt. %; and Al2O3: 0.086 wt. %. The macrostructure of the foam castings is investigated by CT scanning and 3D analysis. The pore size distributions and accumulative fraction dependencies are determined for all samples. The microstructure of the foam castings is investigated by SEM-EDS analysis. The results confirmed the presence of individual nano-sized particles, as well as clusters of particles in foam walls. The conducted compression tests show a significant increase in the plateau stress (up to 237%) of the modified aluminum foam castings compared to non-modified castings. However, a similar effect of the nano-compositions on A356 alloy foam castings is not observed. The obtained results show that the above-indicated concentrations of nanoparticles can positively influence the mechanical properties of aluminum foam castings. The novelty of the current study is two-fold: (1) such low concentrations of added nanoparticles have never been used before to alter Al foam’s properties, and (2) an original method of introducing the nanoparticles into the melt is applied in the form of nano-compositions.

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The Mechanical Performance of Aluminum Foam Fabricated by Melt Processing with Different Foaming Agents: A Comparative Analysis

Cited by 9 publications

References 28 publications

Pore Structure and Deformation Correlation of an Aluminum Foam Sandwich Subject to Three-Point Bending

Pore Structure and Deformation Correlation of an Aluminum Foam Sandwich Subject to Three-Point Bending

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

Al and A356 Alloy Foam Castings Modified with Low Concentrations of Nano-Sized Particles: Structural Study and Compressive Strength Tests

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