Study of the microstructure evolution of heat treated Ti-rich NiTi shape memory alloy

Ghazal Tadayyon; Mohammad Mazinani; Yina Guo; Seyed Mojtaba Zebarjad; Syed A.M. Tofail; Manus J.P. Biggs

doi:10.1016/j.matchar.2015.11.017

Study of the microstructure evolution of heat treated Ti-rich NiTi shape memory alloy

Ghazal Tadayyon, Mohammad Mazinani, Yina Guo, Seyed Mojtaba Zebarjad, Syed A.M. Tofail, Manus J.P. Biggs

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Martensitic evolution in Ti-rich NiTi alloy, Ti50.5Ni49.5, has been investigated as a function of annealing, solution treatment and a combination thereof and a detailed electron microscopic investigation carried out. Self-accommodated martensite plates resulted in all heat treated samples. Martensitic < 011 > type II twins, which are common in NiTi shape memory alloys, was found in both as-received and heat-treated samples. Solution treated samples, additionally, showed {11-1} type I twinning was also found in samples that have been annealed after solution-treatment. Another common feature of the microstructure in both as-received and heat treated samples is the formation of Ti₂Ni precipitates. The size, number and dispersions of these precipitates can be controlled by resorting to a suitable heat treatment e.g. solution treatment.

Original language	English
Pages (from-to)	11-19
Number of pages	9
Journal	Materials Characterization
Volume	112
DOIs	https://doi.org/10.1016/j.matchar.2015.11.017
Publication status	Published - 1 Feb 2016

Keywords

Annealing
Microstructural evolution
Nickel-titanium shape memory alloy
Solution treatment

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10.1016/j.matchar.2015.11.017

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title = "Study of the microstructure evolution of heat treated Ti-rich NiTi shape memory alloy",

abstract = "Martensitic evolution in Ti-rich NiTi alloy, Ti50.5Ni49.5, has been investigated as a function of annealing, solution treatment and a combination thereof and a detailed electron microscopic investigation carried out. Self-accommodated martensite plates resulted in all heat treated samples. Martensitic < 011 > type II twins, which are common in NiTi shape memory alloys, was found in both as-received and heat-treated samples. Solution treated samples, additionally, showed {11-1} type I twinning was also found in samples that have been annealed after solution-treatment. Another common feature of the microstructure in both as-received and heat treated samples is the formation of Ti2Ni precipitates. The size, number and dispersions of these precipitates can be controlled by resorting to a suitable heat treatment e.g. solution treatment.",

keywords = "Annealing, Microstructural evolution, Nickel-titanium shape memory alloy, Solution treatment",

author = "Ghazal Tadayyon and Mohammad Mazinani and Yina Guo and Zebarjad, {Seyed Mojtaba} and Tofail, {Syed A.M.} and Biggs, {Manus J.P.}",

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T1 - Study of the microstructure evolution of heat treated Ti-rich NiTi shape memory alloy

AU - Tadayyon, Ghazal

AU - Mazinani, Mohammad

AU - Guo, Yina

AU - Zebarjad, Seyed Mojtaba

AU - Tofail, Syed A.M.

AU - Biggs, Manus J.P.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - Martensitic evolution in Ti-rich NiTi alloy, Ti50.5Ni49.5, has been investigated as a function of annealing, solution treatment and a combination thereof and a detailed electron microscopic investigation carried out. Self-accommodated martensite plates resulted in all heat treated samples. Martensitic < 011 > type II twins, which are common in NiTi shape memory alloys, was found in both as-received and heat-treated samples. Solution treated samples, additionally, showed {11-1} type I twinning was also found in samples that have been annealed after solution-treatment. Another common feature of the microstructure in both as-received and heat treated samples is the formation of Ti2Ni precipitates. The size, number and dispersions of these precipitates can be controlled by resorting to a suitable heat treatment e.g. solution treatment.

AB - Martensitic evolution in Ti-rich NiTi alloy, Ti50.5Ni49.5, has been investigated as a function of annealing, solution treatment and a combination thereof and a detailed electron microscopic investigation carried out. Self-accommodated martensite plates resulted in all heat treated samples. Martensitic < 011 > type II twins, which are common in NiTi shape memory alloys, was found in both as-received and heat-treated samples. Solution treated samples, additionally, showed {11-1} type I twinning was also found in samples that have been annealed after solution-treatment. Another common feature of the microstructure in both as-received and heat treated samples is the formation of Ti2Ni precipitates. The size, number and dispersions of these precipitates can be controlled by resorting to a suitable heat treatment e.g. solution treatment.

KW - Annealing

KW - Microstructural evolution

KW - Nickel-titanium shape memory alloy

KW - Solution treatment

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JO - Materials Characterization

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Study of the microstructure evolution of heat treated Ti-rich NiTi shape memory alloy

Abstract

Keywords

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