Shape memory functionality under multi-cycles in NiTiHf

H. Sehitoglu; Y. Wu; L. Patriarca

doi:10.1016/j.scriptamat.2016.10.009

Shape memory functionality under multi-cycles in NiTiHf

H. Sehitoglu, Y. Wu, L. Patriarca

Mechanical Science and Engineering

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

Abstract

The functionality of NiTiHf (25%Hf) shape memory alloy (SMA) was studied under isobaric temperature cycling experiments. Both the local and overall strains, determined with digital image correlation (DIC), displayed excellent stability and no measurable unrecovered elongation. The external stress levels were higher than 250 MPa and transformation temperature was 420 °C which exceeds other NiTi based alloys, demonstrating the outstanding potential of the NiTiHf alloys.

Original language	English (US)
Pages (from-to)	11-15
Number of pages	5
Journal	Scripta Materialia
Volume	129
DOIs	https://doi.org/10.1016/j.scriptamat.2016.10.009
State	Published - Mar 1 2017

Keywords

Functional fatigue
High temperature shape memory alloy
NiTiHf
Shape memory effect

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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title = "Shape memory functionality under multi-cycles in NiTiHf",

abstract = "The functionality of NiTiHf (25%Hf) shape memory alloy (SMA) was studied under isobaric temperature cycling experiments. Both the local and overall strains, determined with digital image correlation (DIC), displayed excellent stability and no measurable unrecovered elongation. The external stress levels were higher than 250 MPa and transformation temperature was 420 °C which exceeds other NiTi based alloys, demonstrating the outstanding potential of the NiTiHf alloys.",

keywords = "Functional fatigue, High temperature shape memory alloy, NiTiHf, Shape memory effect",

author = "H. Sehitoglu and Y. Wu and L. Patriarca",

note = "Funding Information: The work was supported by NSF CMMI–1333884 . This support is gratefully acknowledged. We acknowledge Prof. Chumlyakov for growing the single crystals. Mr. Avinesh Ojha calculated the slip stress for NiTi25Hf monoclinic lattice.",

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AU - Wu, Y.

AU - Patriarca, L.

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N2 - The functionality of NiTiHf (25%Hf) shape memory alloy (SMA) was studied under isobaric temperature cycling experiments. Both the local and overall strains, determined with digital image correlation (DIC), displayed excellent stability and no measurable unrecovered elongation. The external stress levels were higher than 250 MPa and transformation temperature was 420 °C which exceeds other NiTi based alloys, demonstrating the outstanding potential of the NiTiHf alloys.

AB - The functionality of NiTiHf (25%Hf) shape memory alloy (SMA) was studied under isobaric temperature cycling experiments. Both the local and overall strains, determined with digital image correlation (DIC), displayed excellent stability and no measurable unrecovered elongation. The external stress levels were higher than 250 MPa and transformation temperature was 420 °C which exceeds other NiTi based alloys, demonstrating the outstanding potential of the NiTiHf alloys.

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KW - Shape memory effect

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