Effect of Al content on porous Ni–Al alloys

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-05, Vol.528 (13), p.4849-4855
• Main Authors: Dong, H.X., He, Y.H., Jiang, Y., Wu, L., Zou, J., Xu, N.P., Huang, B.Y., Liu, C.T.
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum; Condensed matter: structure, mechanical and thermal properties; Deformation and plasticity (including yield, ductility, and superplasticity); Exact sciences and technology; Intermetallic compounds; Intermetallics; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical properties; Mechanical properties of solids; Nickel; Nickel aluminides; Ni–Al intermetallics; Physics; Pore size; Porosity; Porous material; Reactive synthesis; Synthesis
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2011.02.014

► Porous Ni–Al alloys have been prepared by reactive synthesis without space holder. ► We examine the influence of Al content on porous Ni–Al alloys. ► The porosity and pore size increase with increasing of the Al content. ► Both of bending and tensile properties decrease with increasing Al content. Porous Ni–Al alloys with different nominal compositions ranging from Ni–10 wt.% Al to Ni–40 wt.% Al were fabricated through reactive synthesis of Ni and Al elemental powders. It had been found that the volume expansion, maximum pore size and permeability of porous Ni–Al alloys increased with increasing the Al content, indicating that the nature of the pores can be manipulated through changing the Al content. In addition, detailed structural characterizations showed that the fabricated porous Ni–Al alloys can have three crystalline phases (i.e., Ni 3Al, NiAl, and Ni 2Al 3) when using different compositions, in good agreement with the Ni–Al phase diagram. Mechanical strength tests of the fabricated porous Ni–Al alloys were also performed. Both of the bending strength and tensile strength of porous Ni–Al alloys were in the range of 5–80 MPa, and decreased with increasing the Al content.