Shape of a rhombohedral coherent Ti{sub 11}Ni{sub 14} precipitate in a cubic matrix and its growth and dissolution during constrained aging
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
The shape of a coherent rhombohedral precipitate in a cubic matrix and its growth and dissolution during strain-constrained aging were investigated using a time-dependent Ginzburg-Landau kinetic model by taking into account the coupling between the constraint (applied) strain and the local strain. The effect of boundary conditions, constraint strain or constraint stress, has been discussed. A particular example of Ti{sub 11}Ni{sub 14} precipitate growth in a TiNi shape memory alloy was considered without any a priori assumption about the particle shape. It was demonstrated that a Ti{sub 11}Ni{sub 14} precipitate grown from a supersaturated cubic TiNi matrix has a lens-like shape, with its normal parallel to the [111]{sub B2} orientation of the matrix, in agreement with experimental observations. Precipitate growth and dissolution under various strain-constraint conditions have been discussed.
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States)
- OSTI ID:
- 514662
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 6 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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