Oscillative surface morphology in peritectic NiAl using phase-field modeling
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Marius Kist
, Abhik Choudhury and Britta Nestler
Abstract
The NiAl-γ–γ′-system is numerically modeled using a multi-phase-field approach near its peritectic. The free energies are approximated as second order polynomials of the concentration. The parameters of these functions are fitted using experimentally determined values for the peritectic equilibrium concentrations and the liquidus/solidus slopes at the peritectic temperature. A study on lateral growth of a peritectic phase (γ') layer on a primary (γ) substrate reveals an oscillation of the layer interfaces at very low undercoolings (0.08 K). This morphology has its seeds in an oscillatory rotation of the triple junction. A mechanism for the origin of rotation is described and a reason for its disappearance at higher undercoolings is discussed. While the γ–γ′ surface energy as well as the γ interdiffusion constant are unknown, the influence of these parameters on the oscillation morphology is investigated.
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Articles in the same Issue
- Contents
- Contents
- Original Contributions
- Solubility of nitrogen in ferrite; the Fe–N phase diagram
- The Li–C phase equilibria
- Experimental study of phase equilibria in the “SnO”–SiO2–“FeO” system at silica saturation, and fixed oxygen partial pressures at 1473 K
- The evolution of Y distribution during the processing route of mechanically alloyed iron studied by means of atom probe tomography
- Oscillative surface morphology in peritectic NiAl using phase-field modeling
- Microstructural characterisation of oxide layer developed by sulphuric anodisation on 2017A alloys
- Wear and corrosion behaviour of AISI 310 and AISI 316 stainless steels in synthetic mine water
- Superplasticity of coarse-grained Ti-13V-11Cr-3Al alloy
- Research on the creep fracture mechanism of FGH95 Ni-based superalloy
- Hot pressing of Al2O3 matrix ceramic materials improved by diopside additive
- Tungsten heavy alloy as a filler metal for repair welding of dies for high pressure die casting
- A one-pot synthesis of Ag/α-Fe2O3 nanoplates with gelatin and their photocatalytic activity
- Short Communications
- Effects of coating solution concentration on the interlaminar shear strength of carbon fiber/epoxy/nano-CaCO3 composites
- People
- Dr.-Ing. Christa Blank
- DGM News
- DGM News