The influence of Ni4Ti3 precipitates orientation on two-way shape memory effect in a Ni-rich NiTi alloy

M.S. Shakeri; J. Khalil-Allafi; V. Abbasi-Chianeh; Arash Ghabchi

doi:10.1016/j.jallcom.2009.05.084

The influence of Ni₄Ti₃ precipitates orientation on two-way shape memory effect in a Ni-rich NiTi alloy

M.S. Shakeri, J. Khalil-Allafi (Corresponding Author), V. Abbasi-Chianeh, Arash Ghabchi

VTT Technical Research Centre of Finland

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

27 Citations (Scopus)

Abstract

In this present work two-way shape memory effect (TWSME) induced by thermomechanical cycling treatments in a Ni-rich NiTi alloy was investigated.Effect of orientation of metastable and lenticular Ni₄Ti₃ precipitates as a governing parameter in different aging temperatures and time as well as applied strain on TWSME were studied. The results indicate that 450 °C is the optimum aging temperature to achieve highest recovery rate. The increasing of applied strain up to 3.38% and aging time up to 2.5 h at 450 °C improves the recovery rate. It has been concluded that formation of especial variants of Ni₄Ti₃ precipitates during aging and increasing of applied strain on thermomechanical cycling treatments could enhance the TWSME.

Original language	English
Pages (from-to)	320-323
Journal	Journal of Alloys and Compounds
Volume	485
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2009.05.084
Publication status	Published - 2009
MoE publication type	A1 Journal article-refereed

Keywords

Shape memory
NiTi
TWSME
Thermomechanical cycles
Ni4Ti3 precipitates

Access to Document

10.1016/j.jallcom.2009.05.084

Cite this

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title = "The influence of Ni4Ti3 precipitates orientation on two-way shape memory effect in a Ni-rich NiTi alloy",

abstract = "In this present work two-way shape memory effect (TWSME) induced by thermomechanical cycling treatments in a Ni-rich NiTi alloy was investigated.Effect of orientation of metastable and lenticular Ni4Ti3 precipitates as a governing parameter in different aging temperatures and time as well as applied strain on TWSME were studied. The results indicate that 450 °C is the optimum aging temperature to achieve highest recovery rate. The increasing of applied strain up to 3.38% and aging time up to 2.5 h at 450 °C improves the recovery rate. It has been concluded that formation of especial variants of Ni4Ti3 precipitates during aging and increasing of applied strain on thermomechanical cycling treatments could enhance the TWSME.",

keywords = "Shape memory, NiTi, TWSME, Thermomechanical cycles, Ni4Ti3 precipitates",

author = "M.S. Shakeri and J. Khalil-Allafi and V. Abbasi-Chianeh and Arash Ghabchi",

year = "2009",

doi = "10.1016/j.jallcom.2009.05.084",

language = "English",

volume = "485",

pages = "320--323",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier",

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TY - JOUR

T1 - The influence of Ni4Ti3 precipitates orientation on two-way shape memory effect in a Ni-rich NiTi alloy

AU - Shakeri, M.S.

AU - Khalil-Allafi, J.

AU - Abbasi-Chianeh, V.

AU - Ghabchi, Arash

PY - 2009

Y1 - 2009

N2 - In this present work two-way shape memory effect (TWSME) induced by thermomechanical cycling treatments in a Ni-rich NiTi alloy was investigated.Effect of orientation of metastable and lenticular Ni4Ti3 precipitates as a governing parameter in different aging temperatures and time as well as applied strain on TWSME were studied. The results indicate that 450 °C is the optimum aging temperature to achieve highest recovery rate. The increasing of applied strain up to 3.38% and aging time up to 2.5 h at 450 °C improves the recovery rate. It has been concluded that formation of especial variants of Ni4Ti3 precipitates during aging and increasing of applied strain on thermomechanical cycling treatments could enhance the TWSME.

AB - In this present work two-way shape memory effect (TWSME) induced by thermomechanical cycling treatments in a Ni-rich NiTi alloy was investigated.Effect of orientation of metastable and lenticular Ni4Ti3 precipitates as a governing parameter in different aging temperatures and time as well as applied strain on TWSME were studied. The results indicate that 450 °C is the optimum aging temperature to achieve highest recovery rate. The increasing of applied strain up to 3.38% and aging time up to 2.5 h at 450 °C improves the recovery rate. It has been concluded that formation of especial variants of Ni4Ti3 precipitates during aging and increasing of applied strain on thermomechanical cycling treatments could enhance the TWSME.

KW - Shape memory

KW - NiTi

KW - TWSME

KW - Thermomechanical cycles

KW - Ni4Ti3 precipitates

U2 - 10.1016/j.jallcom.2009.05.084

DO - 10.1016/j.jallcom.2009.05.084

M3 - Article

SN - 0925-8388

VL - 485

SP - 320

EP - 323

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -