Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1599664 | Intermetallics | 2016 | 10 Pages |
Abstract
The paper discusses the effect of zirconium and chromium on the microstructure and properties of the aluminide layers produced on an Inconel 713C nickel superalloy substrate. The aluminizing process was conducted using the chemical vapor deposition (CVD) method in AlCl3 + ZrCl3 vapors and a hydrogen atmosphere as the carrier gas. This low-activity aluminizing process yielded a diffusive multi-component aluminide layer composed of three main zones: the outer zone, about 3 μm thick, chiefly built of AlNi2Zr, Ni3Zr and Al3Zr4, the intermediate zone, about 6 μm thick, containing the β-NiAl phase, and the inner zone, with a thickness of about 7 μm, mostly composed of the Cr2Al and β-NiAl grains. The substrate contained semi-coherent γâ²-phases (Ni3Al) separated from the γ-austenite matrix by a dislocation net. DFT calculations have shown that Cr added to β-NiAl markedly increases the elastic constant C11 and the isotropic shear modulus G, whereas the addition of Zr decreases the C44 component. Moreover, zirconium added to β-NiAl increases its plasticity thanks to the formation of wide-spread metallic ZrNi bonds. It has been found that the Zr + Cr-modified aluminide layer formed on the Inconel 713C nickel superalloy improves its corrosion resistance (as measured in a 0.1 M Na2SO4 solution).
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
R. Sitek, P. KwaÅniak, M. Sopicka-Lizer, J. Borysiuk, J. KamiÅski, J. Mizera, K.J. KurzydÅowski,