Synchrotron Sub-μ X-ray Tomography of Kirkendall Porosity in a Diffusion Couple of Nickel-Base Superalloy and Nickel after Annealing at 1250 °C
Artikel i vetenskaplig tidskrift, 2021

Kirkendall porosity that forms during interdiffusion in a diffusion couple of nickel-base superalloy CMSX-10 with pure nickel is investigated. The diffusion experiments are conducted at a temperature of 1250 °C, where the strengthening γ′-phase is partially dissolved. The porosity is studied by X-ray sub-μ tomography with a spatial resolution of about 0.353 μm3 at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. It is found that depending on the distance from the interface the Kirkendall pores take different shapes: octahedral, rounded pyramidal, drop shaped, dendritic, pear shaped, and joint shapes. Such a variety of pore morphologies indicates a complex multistage process of porosity nucleation and growth under vacancy supersaturation of different degrees. The experimental findings are interpreted on the basis of the results of diffusion modeling. It is shown that the kinetics of porosity growth is essentially influenced by the dissolution of the γ′-phase.

porous materials

three-dimensional tomographies

synchrotron radiations

diffusions

nickel alloys

Författare

Alexander Epishin

Technische Universität Berlin

Bettina Camin

Technische Universität Berlin

Lennart Hansen

Technische Universität Berlin

Anton Chyrkin

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Gert Nolze

Bundesanstalt für Materialforschung und -prüfung (BAM)

Advanced Engineering Materials

1438-1656 (ISSN) 1527-2648 (eISSN)

Vol. In Press

Ämneskategorier

Fysikalisk kemi

Annan fysik

Metallurgi och metalliska material

DOI

10.1002/adem.202001220

Mer information

Senast uppdaterat

2021-02-03