Analysis of Ostwald ripening in Ni-rich Ni-Ti alloys by diffusion couples

作者：Garay Reyes C G^*; Hernandez Santiago F; Cayetano Castro N; Martinez Sanchez R; Hernandez Rivera J L; Dorantes Rosalese H J; Cruz Rivera J J

来源：Bulletin of Materials Science, 2014, 37(4): 823-829.

DOI：10.1007/s12034-014-0012-7

• Diffusion couple
• nickel-based alloys
• gamma ' precipitates coarsening
• TIDC theory
• LSW theory
• anomalous coarsening

The coarsening kinetics of gamma' precipitates in Ni-rich Ni-Ti alloys are studied using a Ni-11-5 wt% Ti and pure Ni diffusion couple. The formed concentration gradient allowed to study the aging process at 1023 K (750 degrees C) in Ni-rich Ni Ti alloys with Ti content from 8-62 to 11-15 wt% Ti. In general, during the coarsening of gamma' precipitates, the experimental coarsening kinetics do not fit well to the LSW or TIDC theoretical models and anomalous behaviour of coarsening rate constant (k(r)) associated with gamma' volume-fraction is confirmed at high values.

• 出版日期2014-6