H-Phase Precipitation and Martensitic Transformation in Ni-rich Ni-Ti-Hf and Ni-Ti-Zr High-Temperature Shape Memory Alloys

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dc.contributor.author Evirgen, A.
dc.contributor.author Pons, J.
dc.contributor.author Karaman, I.
dc.contributor.author Noebe, R.D.
dc.contributor.author Santamarta, R.
dc.date.accessioned 2020-05-07T06:16:00Z
dc.identifier.uri http://hdl.handle.net/11201/152264
dc.description.abstract [eng] The distributions of H-phase precipitates in Ni50.3Ti29.7Hf20 and Ni50.3Ti29.7Zr20 alloys formed by aging treatments at 500 and 550 °C or slow furnace cooling and their effects on the thermal martensitic transformation have been investigated by TEM and calorimetry. The comparative study clearly reveals faster precipitate-coarsening kinetics in the NiTiZr alloy than in NiTiHf. For precipitates of a similar size of 10-20 nm in both alloys, the martensite plates in Ni50.3Ti29.7Zr20 have larger widths and span a higher number of precipitates compared with the Ni50.3Ti29.7Hf20 alloy. However, for large H-phase particles with hundreds of nm in length, no significant differences in the martensitic microstructures of both alloy systems have been observed. The martensitic transformation temperatures of Ni50.3Ti29.7Hf20 are ~ 80-90 °C higher than those of Ni50.3Ti29.7Zr20 in the precipitate-free state and in the presence of large particles of hundreds on nm in length, but this difference is reduced to only 10-20 °C in samples with small H-phase precipitates. The changes in the transformation temperatures are consistent with the differences in the precipitate distributions between the two alloy systems observed by TEM.
dc.format application/pdf
dc.relation.isformatof https://doi.org/10.1007/s40830-018-0165-0
dc.relation.ispartof Shape Memory and Superelasticity, 2018, vol. 4, p. 85-92
dc.rights , 2018
dc.subject.classification 53 - Física
dc.subject.other 53 - Physics
dc.title H-Phase Precipitation and Martensitic Transformation in Ni-rich Ni-Ti-Hf and Ni-Ti-Zr High-Temperature Shape Memory Alloys
dc.type info:eu-repo/semantics/article
dc.date.updated 2020-05-07T06:16:00Z
dc.date.embargoEndDate info:eu-repo/date/embargoEnd/2026-12-31
dc.embargo 2026-12-31
dc.rights.accessRights info:eu-repo/semantics/embargoedAccess
dc.identifier.doi https://doi.org/10.1007/s40830-018-0165-0

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