期刊
METALS
卷 13, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/met13071221
关键词
Fe-Ni-Al alloys; diffusion-couples; beta' precipitates; gamma' precipitates; aging; precipitation hardening
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.
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