Heterogenity of Microstructure Evolution in NiTi (50 at% Ni) Alloy Severely Deformed by High Pressure Torsion

R. Singh; J. Fiebig; S. Ostendorp; H. Rösner; E. A. Prokofyev; R. Z. Valiev; S. V. Divinski; G. Wilde

doi:10.1002/9781118062142.ch18

Heterogenity of Microstructure Evolution in NiTi (50 at% Ni) Alloy Severely Deformed by High Pressure Torsion

R. Singh^*, J. Fiebig, S. Ostendorp, H. Rösner, E. A. Prokofyev, R. Z. Valiev, S. V. Divinski, G. Wilde

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Chapter

1 Citation (Scopus)

Abstract

An equiatomic B2 NiTi alloy, severely deformed by high-pressure torsion, was investigated. Nanocrystallization of the as-deformed amorphous matrix has been examined. The formation of internal porosity after long-time annealing was established by the radiotracer technique. Such a porosity prohibited reliable measurements of grain boundary diffusion of the ⁴⁴Ti tracer in the nanocrystallized NiTi alloy. The percolating porosity does not exist in the as-deformed state of NiTi alloy; its formation was affected by free volume redistribution during nanocrystallites' growth under residual stresses. The atomic force microscopy study reveals a highly modified surface with average roughness of about 50 nm after annealing the samples at 600 K for 7 d.

Original language	English
Title of host publication	Supplemental Proceedings
Subtitle of host publication	Materials Fabrication, Properties, Characterization, and Modeling
Publisher	John Wiley and Sons Inc.
Pages	147-154
Number of pages	8
Volume	2
ISBN (Electronic)	9781118062142
ISBN (Print)	9781118029466
DOIs	https://doi.org/10.1002/9781118062142.ch18
Publication status	Published - Apr 20 2011
Externally published	Yes

Keywords

Grain boundary
Nanocrystalline material
Porosity

ASJC Scopus subject areas

General Engineering
General Materials Science

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10.1002/9781118062142.ch18

Cite this

Singh, R., Fiebig, J., Ostendorp, S., Rösner, H., Prokofyev, E. A., Valiev, R. Z., Divinski, S. V., & Wilde, G. (2011). Heterogenity of Microstructure Evolution in NiTi (50 at% Ni) Alloy Severely Deformed by High Pressure Torsion. In Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling (Vol. 2, pp. 147-154). John Wiley and Sons Inc.. https://doi.org/10.1002/9781118062142.ch18

Heterogenity of Microstructure Evolution in NiTi (50 at% Ni) Alloy Severely Deformed by High Pressure Torsion. / Singh, R.; Fiebig, J.; Ostendorp, S. et al.
Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling. Vol. 2 John Wiley and Sons Inc., 2011. p. 147-154.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

Singh, R, Fiebig, J, Ostendorp, S, Rösner, H, Prokofyev, EA, Valiev, RZ, Divinski, SV & Wilde, G 2011, Heterogenity of Microstructure Evolution in NiTi (50 at% Ni) Alloy Severely Deformed by High Pressure Torsion. in Supplemental Proceedings: Materials Fabrication, Properties, Characterization, and Modeling. vol. 2, John Wiley and Sons Inc., pp. 147-154. https://doi.org/10.1002/9781118062142.ch18

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abstract = "An equiatomic B2 NiTi alloy, severely deformed by high-pressure torsion, was investigated. Nanocrystallization of the as-deformed amorphous matrix has been examined. The formation of internal porosity after long-time annealing was established by the radiotracer technique. Such a porosity prohibited reliable measurements of grain boundary diffusion of the 44Ti tracer in the nanocrystallized NiTi alloy. The percolating porosity does not exist in the as-deformed state of NiTi alloy; its formation was affected by free volume redistribution during nanocrystallites' growth under residual stresses. The atomic force microscopy study reveals a highly modified surface with average roughness of about 50 nm after annealing the samples at 600 K for 7 d.",

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AU - Rösner, H.

AU - Prokofyev, E. A.

AU - Valiev, R. Z.

AU - Divinski, S. V.

AU - Wilde, G.

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AB - An equiatomic B2 NiTi alloy, severely deformed by high-pressure torsion, was investigated. Nanocrystallization of the as-deformed amorphous matrix has been examined. The formation of internal porosity after long-time annealing was established by the radiotracer technique. Such a porosity prohibited reliable measurements of grain boundary diffusion of the 44Ti tracer in the nanocrystallized NiTi alloy. The percolating porosity does not exist in the as-deformed state of NiTi alloy; its formation was affected by free volume redistribution during nanocrystallites' growth under residual stresses. The atomic force microscopy study reveals a highly modified surface with average roughness of about 50 nm after annealing the samples at 600 K for 7 d.

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Heterogenity of Microstructure Evolution in NiTi (50 at% Ni) Alloy Severely Deformed by High Pressure Torsion

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Keywords

ASJC Scopus subject areas

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