An in situ TEM study of the size effect on the thermally induced martensitic transformation in nanoscale NiTi shape memory alloy

H. Li; S. Mao; K.T. Zang; Yinong Liu; Z. Guo; S.B. Wang; Y. Zhang; X.Q. Yin

doi:10.1016/j.jallcom.2013.11.119

An in situ TEM study of the size effect on the thermally induced martensitic transformation in nanoscale NiTi shape memory alloy

H. Li, S. Mao, K.T. Zang, Yinong Liu, Z. Guo, S.B. Wang, Y. Zhang, X.Q. Yin

Research output: Contribution to journal › Article

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Abstract

This in situ TEM study investigated the effect of sample thickness on the martensitic transformation of NiTi. The transformation temperature gradually decreased with decreasing sample thickness. No transformation was observed when the thickness was below a critical value. The critical thickness values for the R phase and martensitic transformations were determined to be ∼22 nm and ∼50 nm, respectively, for the Ti-50.8 at.%Ni alloy studied. This apparent "size effect" was attributed to the depletion of Ti in the matrix caused by surface oxidation, as confirmed by oxygen content measurements. These findings demonstrate that natural oxidation and its influence on the transformation temperature must be taken into consideration in the fabrication of micro-electro-mechanical devices using NiTi. © 2013 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	337-342
Journal	Journal of Alloys and Compounds
Volume	588
DOIs	https://doi.org/10.1016/j.jallcom.2013.11.119
Publication status	Published - 2014

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title = "An in situ TEM study of the size effect on the thermally induced martensitic transformation in nanoscale NiTi shape memory alloy",

abstract = "This in situ TEM study investigated the effect of sample thickness on the martensitic transformation of NiTi. The transformation temperature gradually decreased with decreasing sample thickness. No transformation was observed when the thickness was below a critical value. The critical thickness values for the R phase and martensitic transformations were determined to be ∼22 nm and ∼50 nm, respectively, for the Ti-50.8 at.%Ni alloy studied. This apparent {"}size effect{"} was attributed to the depletion of Ti in the matrix caused by surface oxidation, as confirmed by oxygen content measurements. These findings demonstrate that natural oxidation and its influence on the transformation temperature must be taken into consideration in the fabrication of micro-electro-mechanical devices using NiTi. {\textcopyright} 2013 Elsevier B.V. All rights reserved.",

author = "H. Li and S. Mao and K.T. Zang and Yinong Liu and Z. Guo and S.B. Wang and Y. Zhang and X.Q. Yin",

year = "2014",

doi = "10.1016/j.jallcom.2013.11.119",

language = "English",

volume = "588",

pages = "337--342",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier Science & Technology",

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TY - JOUR

T1 - An in situ TEM study of the size effect on the thermally induced martensitic transformation in nanoscale NiTi shape memory alloy

AU - Li, H.

AU - Mao, S.

AU - Zang, K.T.

AU - Liu, Yinong

AU - Guo, Z.

AU - Wang, S.B.

AU - Zhang, Y.

AU - Yin, X.Q.

PY - 2014

Y1 - 2014

N2 - This in situ TEM study investigated the effect of sample thickness on the martensitic transformation of NiTi. The transformation temperature gradually decreased with decreasing sample thickness. No transformation was observed when the thickness was below a critical value. The critical thickness values for the R phase and martensitic transformations were determined to be ∼22 nm and ∼50 nm, respectively, for the Ti-50.8 at.%Ni alloy studied. This apparent "size effect" was attributed to the depletion of Ti in the matrix caused by surface oxidation, as confirmed by oxygen content measurements. These findings demonstrate that natural oxidation and its influence on the transformation temperature must be taken into consideration in the fabrication of micro-electro-mechanical devices using NiTi. © 2013 Elsevier B.V. All rights reserved.

AB - This in situ TEM study investigated the effect of sample thickness on the martensitic transformation of NiTi. The transformation temperature gradually decreased with decreasing sample thickness. No transformation was observed when the thickness was below a critical value. The critical thickness values for the R phase and martensitic transformations were determined to be ∼22 nm and ∼50 nm, respectively, for the Ti-50.8 at.%Ni alloy studied. This apparent "size effect" was attributed to the depletion of Ti in the matrix caused by surface oxidation, as confirmed by oxygen content measurements. These findings demonstrate that natural oxidation and its influence on the transformation temperature must be taken into consideration in the fabrication of micro-electro-mechanical devices using NiTi. © 2013 Elsevier B.V. All rights reserved.

U2 - 10.1016/j.jallcom.2013.11.119

DO - 10.1016/j.jallcom.2013.11.119

M3 - Article

VL - 588

SP - 337

EP - 342

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -