4.5 Article

Analysis of Phase Transformations in Fe-Ni-Al Alloys Using Diffusion Couples of Fe/Fe-33at.%Ni-33at.%Al Alloy/Ni

Journal

METALS
Volume 13, Issue 7, Pages -

Publisher

MDPI
DOI: 10.3390/met13071221

Keywords

Fe-Ni-Al alloys; diffusion-couples; beta' precipitates; gamma' precipitates; aging; precipitation hardening

Ask authors/readers for more resources

This study focused on analyzing phase transformation in Fe-Ni-Al alloys using a diffusion couple of Ni/Fe-Ni-Al/Fe and Calphad-based diffusion and thermodynamic software. Diffusion couples were prepared by annealing at 1100 degrees C for 200 h and then air-cooled. The results showed that the diffusion path between Ni or Fe pure metal and the Fe-33at.%Ni-33at.%Al alloy is not linear. Aging at 750 degrees C promoted inverse precipitation beta'-> beta' + alpha, causing the softening of the alloy. Normal precipitation reactions, alpha ->alpha +beta' and gamma -> gamma +gamma', were also observed during aging at 750 degrees C, resulting in precipitation hardening.
The present work focused on analyzing the phase transformation in Fe-Ni-Al alloys employing a diffusion couple of Ni/Fe-Ni-Al/Fe, and Calphad-based diffusion and thermodynamic software. Diffusion couples were prepared by annealing at 1100 degrees C for 200 h and then air-cooled. These couples were also aged at 750 degrees C for 100 and 275 h. Both numerical and experimental results indicated that the diffusion path between Ni or Fe pure metal and the Fe-33at.%Ni-33at.%Al alloy is not linear. The phases formed during the diffusion anneal at 1100 degrees C correspond to those shown in the Calphad-calculated Fe-Ni-Al equilibrium diagram. The aging treatment at 750 degrees C promoted the inverse precipitation beta'-> beta' + alpha, which caused the softening of the alloy. Moreover, the normal precipitation reactions, alpha ->alpha +beta' and gamma -> gamma +gamma', were also observed to occur during the aging of diffusion couple at 750 degrees C, originating precipitation hardening.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.5
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available