Texture, aging, and superelasticity of selective laser melting fabricated Ni-rich NiTi alloys

Soheil Saedi; Ali Sadi Turabi; Mohsen Taheri Andani; Narges Shayesteh Moghaddam; Mohammad Elahinia; Haluk Ersin Karaca

doi:10.1016/j.msea.2017.01.008

Texture, aging, and superelasticity of selective laser melting fabricated Ni-rich NiTi alloys

Soheil Saedi
, Ali Sadi Turabi
, Mohsen Taheri Andani
, Narges Shayesteh Moghaddam
, Mohammad Elahinia
, Haluk Ersin Karaca

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

208 Scopus citations

Abstract

This work studies the impact of selective laser melting (SLM) fabrication on the microstructure and texture of Ni-rich NiTi alloy. SLM NiTi samples were fabricated with a high laser power of 250 W and 1.25 m/s scanning speed. A comprehensive aging study of as-fabricated alloys is also presented to reveal the effects of aging time and temperature on transformation behavior. The shape memory properties were investigated by shape memory effect and superelasticity experiments. It was found that although SLM fabricated samples show lower strength than the initial ingot, their sharp [001] texture along the building direction improve their superelastic response substantially. In addition, it was shown that transformation temperatures can be tailored and upon thermal treatments of 350 °C-1 h and 600 °C-1.5 h, superelastic recovery up to about 5.5% can be obtained at body and room temperatures which make these alloys very promising for potential biomedical applications.

Original language	English
Pages (from-to)	1-10
Number of pages	10
Journal	Materials Science and Engineering: A
Volume	686
DOIs	https://doi.org/10.1016/j.msea.2017.01.008
State	Published - Feb 16 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

Funding

The authors would like to acknowledge the financial support provided for the project “Nitinol Commercialization Accelerator” by the Ohio Department of Development through Grants WP 10-010, and TVSF awards 14-958 and 15-791. Norwegian Nurses Organisation (NSF) support (CBET-0731087) is also appreciated. We would also like to acknowledge contributions of Dr. X. Wen and SECAT, Center of the Aluminium Technology of University of Kentucky.

Funders	Funder number
Aluminium Technology of University of Kentucky
TVSF	15-791, 14-958
National Science Foundation (NSF)	CBET-0731087
Ohio Department of Development	WP 10-010
Norsk Sykepleierforbund

Keywords

Additive manufacturing
Microstructure
NiTi
Selective laser melting
Shape memory alloy
Superelasticity

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2017.01.008

Cite this

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title = "Texture, aging, and superelasticity of selective laser melting fabricated Ni-rich NiTi alloys",

abstract = "This work studies the impact of selective laser melting (SLM) fabrication on the microstructure and texture of Ni-rich NiTi alloy. SLM NiTi samples were fabricated with a high laser power of 250 W and 1.25 m/s scanning speed. A comprehensive aging study of as-fabricated alloys is also presented to reveal the effects of aging time and temperature on transformation behavior. The shape memory properties were investigated by shape memory effect and superelasticity experiments. It was found that although SLM fabricated samples show lower strength than the initial ingot, their sharp [001] texture along the building direction improve their superelastic response substantially. In addition, it was shown that transformation temperatures can be tailored and upon thermal treatments of 350 °C-1 h and 600 °C-1.5 h, superelastic recovery up to about 5.5\% can be obtained at body and room temperatures which make these alloys very promising for potential biomedical applications.",

keywords = "Additive manufacturing, Microstructure, NiTi, Selective laser melting, Shape memory alloy, Superelasticity",

author = "Soheil Saedi and Turabi, \{Ali Sadi\} and Andani, \{Mohsen Taheri\} and Moghaddam, \{Narges Shayesteh\} and Mohammad Elahinia and Karaca, \{Haluk Ersin\}",

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year = "2017",

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day = "16",

doi = "10.1016/j.msea.2017.01.008",

language = "English",

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AU - Saedi, Soheil

AU - Turabi, Ali Sadi

AU - Andani, Mohsen Taheri

AU - Moghaddam, Narges Shayesteh

AU - Elahinia, Mohammad

AU - Karaca, Haluk Ersin

PY - 2017/2/16

Y1 - 2017/2/16

N2 - This work studies the impact of selective laser melting (SLM) fabrication on the microstructure and texture of Ni-rich NiTi alloy. SLM NiTi samples were fabricated with a high laser power of 250 W and 1.25 m/s scanning speed. A comprehensive aging study of as-fabricated alloys is also presented to reveal the effects of aging time and temperature on transformation behavior. The shape memory properties were investigated by shape memory effect and superelasticity experiments. It was found that although SLM fabricated samples show lower strength than the initial ingot, their sharp [001] texture along the building direction improve their superelastic response substantially. In addition, it was shown that transformation temperatures can be tailored and upon thermal treatments of 350 °C-1 h and 600 °C-1.5 h, superelastic recovery up to about 5.5% can be obtained at body and room temperatures which make these alloys very promising for potential biomedical applications.

AB - This work studies the impact of selective laser melting (SLM) fabrication on the microstructure and texture of Ni-rich NiTi alloy. SLM NiTi samples were fabricated with a high laser power of 250 W and 1.25 m/s scanning speed. A comprehensive aging study of as-fabricated alloys is also presented to reveal the effects of aging time and temperature on transformation behavior. The shape memory properties were investigated by shape memory effect and superelasticity experiments. It was found that although SLM fabricated samples show lower strength than the initial ingot, their sharp [001] texture along the building direction improve their superelastic response substantially. In addition, it was shown that transformation temperatures can be tailored and upon thermal treatments of 350 °C-1 h and 600 °C-1.5 h, superelastic recovery up to about 5.5% can be obtained at body and room temperatures which make these alloys very promising for potential biomedical applications.

KW - Additive manufacturing

KW - Microstructure

KW - NiTi

KW - Selective laser melting

KW - Shape memory alloy

KW - Superelasticity

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DO - 10.1016/j.msea.2017.01.008

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SN - 0921-5093

VL - 686

SP - 1

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JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Texture, aging, and superelasticity of selective laser melting fabricated Ni-rich NiTi alloys

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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