Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 628, Issue -, Pages 287-292Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.12.172
Keywords
Shape memory; Phase transition; Precipitation; Coherency; Thermoelastic martensitic transformation
Categories
Funding
- Tohoku University
- National Natural Science Foundation of China [51201100]
- National Basic Research Program of China (973 Programs) [2012CB619400]
- Shanghai Jiao Tong University
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The martensitic transformation characteristics and coherency of ordered gamma' precipitates are investigated by electrical resistivity tests and HAADF-STEM observation in the aged FeNiCoAlTaB alloys. The results reveal that the precipitate grows up in the Ostwald ripening mode at the initial aging stage. As aging time increasing, the coarsening behavior of precipitates deviates from the Ostwald ripening and the martensitic transformation changes from the thermoelastic type to the non-thermoelastic one. The thermoelastic to non-thermoelastic transition with increasing precipitates size results from coherency loss between precipitates and matrix during martensitic transformation. (C) 2014 Elsevier B.V. All rights reserved.
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