Post-aging cooling rate effects in Ni45.3Ti34.7Hf15Pd5 shape memory alloys

E. Acar; S. Saedi; G. P. Toker; H. Tobe; H. E. Karaca

doi:10.1016/j.materresbull.2020.111016

Post-aging cooling rate effects in Ni_45.3Ti_34.7Hf₁₅Pd₅ shape memory alloys

E. Acar, S. Saedi, G. P. Toker, H. Tobe, H. E. Karaca

Mechanical Engineering

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

3 Scopus citations

Abstract

Effects of post-aging cooling rate (water quenched, WQ, and furnace cooled, FC) on the shape memory properties of polycrystalline Ni_45.3Ti_34.7Hf₁₅Pd₅ alloys were studied. Their functional properties such as transformation temperatures, hysteresis, elastic energy, superelastic behavior and recoverable strain were found to be closely related to the post-aging cooling rate. Martensite start temperature decreased from 77 °C for WQ sample to 22 °C for FC sample. Impressive shape memory effect was observed under a huge compressive stress of 1 GPa with recoverable strains of 2.2 % and 2.5 % for the water quenched and furnace cooled samples, respectively. While both WQ and FC alloys showed perfect superelasticity for a wide temperature range, the WQ sample showed superelasticity at higher temperatures above 100 °C.

Original language	English
Article number	111016
Journal	Materials Research Bulletin
Volume	133
DOIs	https://doi.org/10.1016/j.materresbull.2020.111016
State	Published - Jan 2021

Bibliographical note

Funding Information:
This research is partially supported by the National Science Foundation under Grant Number CMMI-1538770 .

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

Microstructure
NiTiHfPd
Phase transformation
Post-aging cooling rate
Shape memory

ASJC Scopus subject areas

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

Access to Document

10.1016/j.materresbull.2020.111016

Cite this

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title = "Post-aging cooling rate effects in Ni45.3Ti34.7Hf15Pd5 shape memory alloys",

abstract = "Effects of post-aging cooling rate (water quenched, WQ, and furnace cooled, FC) on the shape memory properties of polycrystalline Ni45.3Ti34.7Hf15Pd5 alloys were studied. Their functional properties such as transformation temperatures, hysteresis, elastic energy, superelastic behavior and recoverable strain were found to be closely related to the post-aging cooling rate. Martensite start temperature decreased from 77 °C for WQ sample to 22 °C for FC sample. Impressive shape memory effect was observed under a huge compressive stress of 1 GPa with recoverable strains of 2.2 % and 2.5 % for the water quenched and furnace cooled samples, respectively. While both WQ and FC alloys showed perfect superelasticity for a wide temperature range, the WQ sample showed superelasticity at higher temperatures above 100 °C.",

keywords = "Microstructure, NiTiHfPd, Phase transformation, Post-aging cooling rate, Shape memory",

author = "E. Acar and S. Saedi and Toker, {G. P.} and H. Tobe and Karaca, {H. E.}",

note = "Funding Information: This research is partially supported by the National Science Foundation under Grant Number CMMI-1538770 . Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

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doi = "10.1016/j.materresbull.2020.111016",

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T1 - Post-aging cooling rate effects in Ni45.3Ti34.7Hf15Pd5 shape memory alloys

AU - Acar, E.

AU - Saedi, S.

AU - Toker, G. P.

AU - Tobe, H.

AU - Karaca, H. E.

PY - 2021/1

Y1 - 2021/1

N2 - Effects of post-aging cooling rate (water quenched, WQ, and furnace cooled, FC) on the shape memory properties of polycrystalline Ni45.3Ti34.7Hf15Pd5 alloys were studied. Their functional properties such as transformation temperatures, hysteresis, elastic energy, superelastic behavior and recoverable strain were found to be closely related to the post-aging cooling rate. Martensite start temperature decreased from 77 °C for WQ sample to 22 °C for FC sample. Impressive shape memory effect was observed under a huge compressive stress of 1 GPa with recoverable strains of 2.2 % and 2.5 % for the water quenched and furnace cooled samples, respectively. While both WQ and FC alloys showed perfect superelasticity for a wide temperature range, the WQ sample showed superelasticity at higher temperatures above 100 °C.

AB - Effects of post-aging cooling rate (water quenched, WQ, and furnace cooled, FC) on the shape memory properties of polycrystalline Ni45.3Ti34.7Hf15Pd5 alloys were studied. Their functional properties such as transformation temperatures, hysteresis, elastic energy, superelastic behavior and recoverable strain were found to be closely related to the post-aging cooling rate. Martensite start temperature decreased from 77 °C for WQ sample to 22 °C for FC sample. Impressive shape memory effect was observed under a huge compressive stress of 1 GPa with recoverable strains of 2.2 % and 2.5 % for the water quenched and furnace cooled samples, respectively. While both WQ and FC alloys showed perfect superelasticity for a wide temperature range, the WQ sample showed superelasticity at higher temperatures above 100 °C.

KW - Microstructure

KW - NiTiHfPd

KW - Phase transformation

KW - Post-aging cooling rate

KW - Shape memory

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