ARTÍCULO

Study of Coarsening in c0 Precipitates by Diffusion Couples

C. G. Garay-Reyes1, S. E. Herna´ndez-Martı´nez2,J. L. Herna´ndez-Rivera2,I. Estrada-Guel1, H. J. Dorantes-Rosales3,J. J. Cruz-Rivera2 R. Martı´nez-Sa´nchez1
Metallogr. Microstruct. Anal. DOI 10.1007/s13632-015-0231-3, 2015.

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ABSTRACT:

The coarsening kinetics of c’ precipitates and Vickers hardness evolution are studied along a concentration gradient generated in a Ni-13.75Ti (at.%)/pure Ni diffusion couple at 1123, 1023, and 923 K. The formed concentration gradient allowed studying the aging process in Ni-rich Ni–Ti alloys with Ti content from 10.36 to 13.33 Ti (at.%). It was possible to determine experimentally the solvus line and precipitation boundary of the c’ phase at 1123 K by using the information obtained in such gradient. In addition to this, a comparison between the experimental coarsening kinetics and the LSW or TIDC theoretical models was carried out during the c’ precipitates coarsening.