| Title |
High Temperature Compressive Deformation and Energy-Absorption Behaviors of Powder-Alloyed Ni-22.4%Fe-22.0%Cr-6.0%Al Superalloy Metallic Foams |
| Authors |
(Kyu-Sik Kim) ; (Ui-Jong Lee) ; (Jung-Yeul Yun) ; (Kee-Ahn Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2026.64.6.481 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Ni-Fe-Cr-Al Superalloy Foam; Powder Alloying Process; Compressive Deformation; Energy-Absorption Properties; High Temperature |
| Abstract |
High temperature compressive deformation and energy-absorption behaviors of Ni-Fe-Cr-Al
superalloy foams fabricated by powder alloying method were investigated in this study. Moreover, the effect
of pore sizes (~580 μm and ~800 μm) and temperatures on the mechanical properties of Ni-based superalloy
foams were also discussed. The alloying powders were sprayed to the commercial pure Ni foams, and then
a sintering process was applied to fabricate homogeneous Ni-22.4%Fe-22.0%Cr-6.0%Al (in wt.%) alloy foams.
The precision control of chemical composition was possible using the amount of sprayed powders. The
microstructure and phase analyses of Ni-based superalloy foams were conducted by scanning electron
microscopy (SEM), X-ray diffraction (XRD), and energy dispersion spectroscopy (EDS). The results showed
that superalloy foams consisted of common γ, γ’, and β-NiAl intermetallic phases with regardless of initial
average pore sizes. Compressive deformation behavior of Ni-Fe-Cr-Al foams was showed typical compressive
flow curves of plastically deformable metallic foams. Plateau strengths of Ni-based alloy foams with different
average pore sizes were 2.98 MPa for the 800 foam and 4.38 MPa for the 580 foam at room temperature.
Plateau strengths were maintained up to 873 K, however, continuously decreased with increasing
temperature. Ni-Fe-Cr-Al superalloy foams showed superior energy absorption properties at room
temperature compared with other Ni-based alloy foams. It is also noteworthy that quantities of the absorbed
energy were almost maintained up to 873 K because of the existence of thermally stable β-NiAl and abnormal
strengthening phenomena of γ’ phases. And thus, the combination of plastically deformable γ phase as matrix
and the proper amount of strengthening phases (γ’, β-NiAl) in the Ni-Fe-Cr-Al superalloy foams exhibits
superior energy absorption properties from room to high temperature. |