Morphological evolution of coherent multi-variant Ti11Ni14 precipitates in Ti-Ni alloys under an applied stress—a computer simulation study
✍ Scribed by D.Y. Li; L.Q. Chen
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 533 KB
- Volume
- 46
- Category
- Article
- ISSN
- 1359-6454
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✦ Synopsis
AbstractÐCoherent precipitation of multi-variant Ti 11 Ni 14 precipitates in TiNi alloys was investigated by employing a continuum ®eld kinetic model. The structural dierence between the precipitate phase and the matrix as well as the orientational dierences between precipitate variants are distinguished by nonconserved structural ®eld variables, whereas the compositional dierence between the precipitate and matrix is described by a conserved ®eld variable. The temporal evolution of the spatially dependent ®eld variables is determined by numerically solving the time-dependent Ginzburg±Landau (TDGL) equations for the structural variables and the Cahn±Hilliard diusion equation for the composition. In particular, the interaction between precipitates, and the growth morphology of Ti 11 Ni 14 precipitates under strain-constraints were studied, without a priori assumptions on the precipitate shape and distribution. The predicted morphology and distribution of Ti 11 Ni 14 variants were compared with experimental observations. Excellent agreement between the simulation and experimental observations was found.