Experimental Investigation and Thermodynamic Modelling of the Fe-Ni-Ta System
The liquidus surface projection and isothermal sections at 1200 and 1000 °C of the Fe-Ni-Ta system were established by Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectrometry (EDS) and x-ray diffraction (XRD). Eight primary solidification regions in the liquidus surface projec...
Saved in:
Published in | Journal of phase equilibria and diffusion Vol. 41; no. 4; pp. 500 - 521 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.08.2020
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The liquidus surface projection and isothermal sections at 1200 and 1000 °C of the Fe-Ni-Ta system were established by Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectrometry (EDS) and x-ray diffraction (XRD). Eight primary solidification regions in the liquidus surface projection were experimentally obtained. The similar phase relations were derived in the isothermal sections at 1200 and 1000 °C. Based on the experimental results in the present work and reported in the literature, the Fe-Ni-Ta system was optimized by means of CALPHAD (CALculation of PHAse Diagram) method. Solution phases (liquid, fcc, bcc) were treated as the substitutional solution. The compounds Fe
2
Ta, Ni
2
Ta, Ni
3
Ta and NiTa
2
were treated as (Fe,Ni,Ta)
m
(Fe,Ni,Ta)
n
by a two-sublattice model, and (Fe,Ni)
7
Ta
6
was modelled as (Fe,Ni,Ta)
1
(Ta)
4
(Fe,Ni,Ta)
2
(Fe,Ni,Ta)
6
by a four-sublattice model. A set of self-consistent thermodynamic parameters for the Fe-Ni-Ta system was acquired. |
---|---|
ISSN: | 1547-7037 1863-7345 1934-7243 |
DOI: | 10.1007/s11669-020-00807-3 |