Shape memory behavior of Ni40.3Ti39.7Hf15Pd5 and Ni40.3Ti44.7Hf10Pd5 alloys

Guher P. Toker; Soheil Saedi; Emre Acar; Osman Ozbulut; Haluk E. Karaca

doi:10.1016/j.jallcom.2018.05.029

Shape memory behavior of Ni_40.3Ti_39.7Hf₁₅Pd₅ and Ni_40.₃Ti_44.7Hf₁₀Pd₅ alloys

Guher P. Toker
, Soheil Saedi
, Emre Acar
, Osman Ozbulut
, Haluk E. Karaca

Producción científica: Article › revisión exhaustiva

10 Citas (Scopus)

Resumen

The microstructure and shape memory properties of Ni_40.3Ti_39.7Hf₁₅Pd₅ and Ni_40.3Ti_44.7Hf₁₀Pd₅ alloys were investigated. It was revealed that transformation temperatures of these alloys can be tailored by thermal treatments and composition alteration. Heat treated Ni_40.3Ti_39.7Hf₁₅Pd₅ can show shape memory effect at above 100 °C. Both alloys showed shape memory effect, however, superelasticity was not observed due to the large thermal hysteresis and high rate of increase in transformation temperatures with stress. Both alloys have higher strength but considerably lower transformation strain than NiTi. Microstructure features also were investigated for grains, distribution and composition of secondary phase. It was revealed that secondary phases lead to decrease the recoverable strains of the NiTiHfPd alloys. As-received Ni_40.3Ti_44.7Hf₁₀Pd₅ and Ni_40.3Ti_39.7Hf₁₅Pd₅ have recoverable strains of 1.12% and 0.43% under 700 MPa, respectively.

Idioma original	English
Páginas (desde-hasta)	1012-1017
Número de páginas	6
Publicación	Journal of Alloys and Compounds
Volumen	763
DOI	https://doi.org/10.1016/j.jallcom.2018.05.029
Estado	Published - sept 30 2018

Nota bibliográfica

Publisher Copyright:
© 2018 Elsevier B.V.

Financiación

This work was supported in part by the NSF CMMI-1538665 program.

Financiadores	Número del financiador
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	CMMI-1538665
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Shape memory behavior of Ni40.3Ti39.7Hf15Pd5 and Ni40.3Ti44.7Hf10Pd5 alloys",

abstract = "The microstructure and shape memory properties of Ni40.3Ti39.7Hf15Pd5 and Ni40.3Ti44.7Hf10Pd5 alloys were investigated. It was revealed that transformation temperatures of these alloys can be tailored by thermal treatments and composition alteration. Heat treated Ni40.3Ti39.7Hf15Pd5 can show shape memory effect at above 100 °C. Both alloys showed shape memory effect, however, superelasticity was not observed due to the large thermal hysteresis and high rate of increase in transformation temperatures with stress. Both alloys have higher strength but considerably lower transformation strain than NiTi. Microstructure features also were investigated for grains, distribution and composition of secondary phase. It was revealed that secondary phases lead to decrease the recoverable strains of the NiTiHfPd alloys. As-received Ni40.3Ti44.7Hf10Pd5 and Ni40.3Ti39.7Hf15Pd5 have recoverable strains of 1.12\% and 0.43\% under 700 MPa, respectively.",

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author = "Toker, \{Guher P.\} and Soheil Saedi and Emre Acar and Osman Ozbulut and Karaca, \{Haluk E.\}",

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AU - Toker, Guher P.

AU - Saedi, Soheil

AU - Acar, Emre

AU - Ozbulut, Osman

AU - Karaca, Haluk E.

PY - 2018/9/30

Y1 - 2018/9/30

N2 - The microstructure and shape memory properties of Ni40.3Ti39.7Hf15Pd5 and Ni40.3Ti44.7Hf10Pd5 alloys were investigated. It was revealed that transformation temperatures of these alloys can be tailored by thermal treatments and composition alteration. Heat treated Ni40.3Ti39.7Hf15Pd5 can show shape memory effect at above 100 °C. Both alloys showed shape memory effect, however, superelasticity was not observed due to the large thermal hysteresis and high rate of increase in transformation temperatures with stress. Both alloys have higher strength but considerably lower transformation strain than NiTi. Microstructure features also were investigated for grains, distribution and composition of secondary phase. It was revealed that secondary phases lead to decrease the recoverable strains of the NiTiHfPd alloys. As-received Ni40.3Ti44.7Hf10Pd5 and Ni40.3Ti39.7Hf15Pd5 have recoverable strains of 1.12% and 0.43% under 700 MPa, respectively.

AB - The microstructure and shape memory properties of Ni40.3Ti39.7Hf15Pd5 and Ni40.3Ti44.7Hf10Pd5 alloys were investigated. It was revealed that transformation temperatures of these alloys can be tailored by thermal treatments and composition alteration. Heat treated Ni40.3Ti39.7Hf15Pd5 can show shape memory effect at above 100 °C. Both alloys showed shape memory effect, however, superelasticity was not observed due to the large thermal hysteresis and high rate of increase in transformation temperatures with stress. Both alloys have higher strength but considerably lower transformation strain than NiTi. Microstructure features also were investigated for grains, distribution and composition of secondary phase. It was revealed that secondary phases lead to decrease the recoverable strains of the NiTiHfPd alloys. As-received Ni40.3Ti44.7Hf10Pd5 and Ni40.3Ti39.7Hf15Pd5 have recoverable strains of 1.12% and 0.43% under 700 MPa, respectively.

KW - Mechanical characterization

KW - Shape memory alloys

KW - Superelasticity

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