Spherical indentation of NiTi-based shape memory alloys

Peizhen Li; Haluk E. Karaca; Yang Tse Cheng

doi:10.1016/j.jallcom.2015.07.280

Spherical indentation of NiTi-based shape memory alloys

Peizhen Li, Haluk E. Karaca, Yang Tse Cheng

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

31 Scopus citations

Abstract

In this study, spherical indentation responses of room temperature superelastic (homogenized Ni_50.8Ti_49.2 and 400°C 3 h aged Ni_45.3Ti_29.7Hf₂₀Pd₅) and nonsuperelastic (Ni_49.9Ti_50.1 and 600°C 3 h aged Ni_45.3Ti_29.7Hf₂₀Pd₅) are revealed as functions of maximum loading level in nano and macro scales. Experimental results showed that for all alloys, the depth and work recovery ratio decrease and then saturate with h_max/R. In contrast, indentation hardness increases and then saturates with indentation depth. Both NiTi and NiTiHfPd alloys have higher hardness in austenite than in martensite. NiTiHfPd alloys have a higher indentation hardness than NiTi alloys which was attributed to the higher strength of NiTiHfPd alloys.

Original language	English
Pages (from-to)	724-730
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	651
DOIs	https://doi.org/10.1016/j.jallcom.2015.07.280
State	Published - Dec 5 2015

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© 2015 Elsevier B.V. All rights reserved.

Keywords

Hardness
NiTi
NiTiHfPd alloys
Phase transformation
Shape memory alloys
Spherical indentation

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2015.07.280

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title = "Spherical indentation of NiTi-based shape memory alloys",

abstract = "In this study, spherical indentation responses of room temperature superelastic (homogenized Ni50.8Ti49.2 and 400°C 3 h aged Ni45.3Ti29.7Hf20Pd5) and nonsuperelastic (Ni49.9Ti50.1 and 600°C 3 h aged Ni45.3Ti29.7Hf20Pd5) are revealed as functions of maximum loading level in nano and macro scales. Experimental results showed that for all alloys, the depth and work recovery ratio decrease and then saturate with hmax/R. In contrast, indentation hardness increases and then saturates with indentation depth. Both NiTi and NiTiHfPd alloys have higher hardness in austenite than in martensite. NiTiHfPd alloys have a higher indentation hardness than NiTi alloys which was attributed to the higher strength of NiTiHfPd alloys.",

keywords = "Hardness, NiTi, NiTiHfPd alloys, Phase transformation, Shape memory alloys, Spherical indentation",

author = "Peizhen Li and Karaca, {Haluk E.} and Cheng, {Yang Tse}",

year = "2015",

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doi = "10.1016/j.jallcom.2015.07.280",

language = "English",

volume = "651",

pages = "724--730",

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T1 - Spherical indentation of NiTi-based shape memory alloys

AU - Li, Peizhen

AU - Karaca, Haluk E.

AU - Cheng, Yang Tse

PY - 2015/12/5

Y1 - 2015/12/5

N2 - In this study, spherical indentation responses of room temperature superelastic (homogenized Ni50.8Ti49.2 and 400°C 3 h aged Ni45.3Ti29.7Hf20Pd5) and nonsuperelastic (Ni49.9Ti50.1 and 600°C 3 h aged Ni45.3Ti29.7Hf20Pd5) are revealed as functions of maximum loading level in nano and macro scales. Experimental results showed that for all alloys, the depth and work recovery ratio decrease and then saturate with hmax/R. In contrast, indentation hardness increases and then saturates with indentation depth. Both NiTi and NiTiHfPd alloys have higher hardness in austenite than in martensite. NiTiHfPd alloys have a higher indentation hardness than NiTi alloys which was attributed to the higher strength of NiTiHfPd alloys.

AB - In this study, spherical indentation responses of room temperature superelastic (homogenized Ni50.8Ti49.2 and 400°C 3 h aged Ni45.3Ti29.7Hf20Pd5) and nonsuperelastic (Ni49.9Ti50.1 and 600°C 3 h aged Ni45.3Ti29.7Hf20Pd5) are revealed as functions of maximum loading level in nano and macro scales. Experimental results showed that for all alloys, the depth and work recovery ratio decrease and then saturate with hmax/R. In contrast, indentation hardness increases and then saturates with indentation depth. Both NiTi and NiTiHfPd alloys have higher hardness in austenite than in martensite. NiTiHfPd alloys have a higher indentation hardness than NiTi alloys which was attributed to the higher strength of NiTiHfPd alloys.

KW - Hardness

KW - NiTi

KW - NiTiHfPd alloys

KW - Phase transformation

KW - Shape memory alloys

KW - Spherical indentation

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VL - 651

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EP - 730

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Spherical indentation of NiTi-based shape memory alloys

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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