Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility

L. K. Iroc; O. U. Tukac; B. B. Tanrisevdi; Osman El-Atwani; Matheus Tunes; Y. E. Kalay; E. Aydogan

doi:10.1016/j.matdes.2022.111239

Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility

L. K. Iroc, O. U. Tukac, B. B. Tanrisevdi, Osman El-Atwani, Matheus Tunes, Y. E. Kalay, E. Aydogan

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

3 Citations (Scopus)

Abstract

Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening at high temperatures. In this study, we show that oxygen-doping can be used as a new alloy design strategy for tailoring the mechanical behavior of the TiZrHfNbTa alloy: a novel low-density (7.98 g/cm3) ductile RHEA. Even though the material is a single-phase BCC with some oxides at room temperature, secondary BCC and HCP nano-lamellar structures start to form above 600 °C in addition to the nano-twins which are shown to be stable up to 1000 °C. This alloy shows superior strength and compressive ductility due to the nanoengineered microstructure. The present study sheds light on tailoring the strength-ductility balance in RHEAs by controlling the microstructure of novel RHEAs at the nanoscale via oxygen-doping.

Original language	English
Article number	111239
Number of pages	12
Journal	Materials and Design
Volume	223.2022
Issue number	November
DOIs	https://doi.org/10.1016/j.matdes.2022.111239
Publication status	Published - Nov 2022
Externally published	Yes

Bibliographical note

Funding Information:
This work was partly supported by the Scientific and Technological Research Council of Turkey under the TUBITAK-2232 program project number 118C239. Authors would like to acknowledge S. Ozturk for the help on TEM, and Stuart Maloy for fruitful discussions. MAT would like to thank the support from the Laboratory Directed Research and Development (LDRD) program of the Los Alamos National Laboratory under project number 20200689PRD2. OEA acknowledges support from the LDRD’s early career program number 20210626ECR and DOE-FES program with code AT2030110.

Funding Information:
This work was partly supported by the Scientific and Technological Research Council of Turkey under the TUBITAK-2232 program project number 118C239. Authors would like to acknowledge S. Ozturk for the help on TEM, and Stuart Maloy for fruitful discussions. MAT would like to thank the support from the Laboratory Directed Research and Development (LDRD) program of the Los Alamos National Laboratory under project number 20200689PRD2. OEA acknowledges support from the LDRD's early career program number 20210626ECR and DOE-FES program with code AT2030110. Scientific and Technological Research Council of Turkey: grant TUBITAK-2232 program project number 118C239. Laboratory Directed Research and Development (LDRD): grants 20200689PRD2 and 20210626ECR. U.S. Department of Energy: grant AT2030110. All data are available in the main text or the supplementary materials.

Publisher Copyright:
© 2022

Keywords

CALPHAD
In-situ TEM
Nano-lamellar structures
Nanotwins
Refractory High Entropy Alloys (RHEAs)

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10.1016/j.matdes.2022.111239

Cite this

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title = "Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility",

abstract = "Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening at high temperatures. In this study, we show that oxygen-doping can be used as a new alloy design strategy for tailoring the mechanical behavior of the TiZrHfNbTa alloy: a novel low-density (7.98 g/cm3) ductile RHEA. Even though the material is a single-phase BCC with some oxides at room temperature, secondary BCC and HCP nano-lamellar structures start to form above 600 °C in addition to the nano-twins which are shown to be stable up to 1000 °C. This alloy shows superior strength and compressive ductility due to the nanoengineered microstructure. The present study sheds light on tailoring the strength-ductility balance in RHEAs by controlling the microstructure of novel RHEAs at the nanoscale via oxygen-doping.",

keywords = "CALPHAD, In-situ TEM, Nano-lamellar structures, Nanotwins, Refractory High Entropy Alloys (RHEAs)",

author = "Iroc, {L. K.} and Tukac, {O. U.} and Tanrisevdi, {B. B.} and Osman El-Atwani and Matheus Tunes and Kalay, {Y. E.} and E. Aydogan",

note = "Funding Information: This work was partly supported by the Scientific and Technological Research Council of Turkey under the TUBITAK-2232 program project number 118C239. Authors would like to acknowledge S. Ozturk for the help on TEM, and Stuart Maloy for fruitful discussions. MAT would like to thank the support from the Laboratory Directed Research and Development (LDRD) program of the Los Alamos National Laboratory under project number 20200689PRD2. OEA acknowledges support from the LDRD{\textquoteright}s early career program number 20210626ECR and DOE-FES program with code AT2030110. Funding Information: This work was partly supported by the Scientific and Technological Research Council of Turkey under the TUBITAK-2232 program project number 118C239. Authors would like to acknowledge S. Ozturk for the help on TEM, and Stuart Maloy for fruitful discussions. MAT would like to thank the support from the Laboratory Directed Research and Development (LDRD) program of the Los Alamos National Laboratory under project number 20200689PRD2. OEA acknowledges support from the LDRD's early career program number 20210626ECR and DOE-FES program with code AT2030110. Scientific and Technological Research Council of Turkey: grant TUBITAK-2232 program project number 118C239. Laboratory Directed Research and Development (LDRD): grants 20200689PRD2 and 20210626ECR. U.S. Department of Energy: grant AT2030110. All data are available in the main text or the supplementary materials. Publisher Copyright: {\textcopyright} 2022",

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language = "English",

volume = "223.2022",

journal = "Materials and Design",

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AU - Iroc, L. K.

AU - Tukac, O. U.

AU - Tanrisevdi, B. B.

AU - El-Atwani, Osman

AU - Tunes, Matheus

AU - Kalay, Y. E.

AU - Aydogan, E.

N1 - Funding Information: This work was partly supported by the Scientific and Technological Research Council of Turkey under the TUBITAK-2232 program project number 118C239. Authors would like to acknowledge S. Ozturk for the help on TEM, and Stuart Maloy for fruitful discussions. MAT would like to thank the support from the Laboratory Directed Research and Development (LDRD) program of the Los Alamos National Laboratory under project number 20200689PRD2. OEA acknowledges support from the LDRD’s early career program number 20210626ECR and DOE-FES program with code AT2030110. Funding Information: This work was partly supported by the Scientific and Technological Research Council of Turkey under the TUBITAK-2232 program project number 118C239. Authors would like to acknowledge S. Ozturk for the help on TEM, and Stuart Maloy for fruitful discussions. MAT would like to thank the support from the Laboratory Directed Research and Development (LDRD) program of the Los Alamos National Laboratory under project number 20200689PRD2. OEA acknowledges support from the LDRD's early career program number 20210626ECR and DOE-FES program with code AT2030110. Scientific and Technological Research Council of Turkey: grant TUBITAK-2232 program project number 118C239. Laboratory Directed Research and Development (LDRD): grants 20200689PRD2 and 20210626ECR. U.S. Department of Energy: grant AT2030110. All data are available in the main text or the supplementary materials. Publisher Copyright: © 2022

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N2 - Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening at high temperatures. In this study, we show that oxygen-doping can be used as a new alloy design strategy for tailoring the mechanical behavior of the TiZrHfNbTa alloy: a novel low-density (7.98 g/cm3) ductile RHEA. Even though the material is a single-phase BCC with some oxides at room temperature, secondary BCC and HCP nano-lamellar structures start to form above 600 °C in addition to the nano-twins which are shown to be stable up to 1000 °C. This alloy shows superior strength and compressive ductility due to the nanoengineered microstructure. The present study sheds light on tailoring the strength-ductility balance in RHEAs by controlling the microstructure of novel RHEAs at the nanoscale via oxygen-doping.

AB - Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening at high temperatures. In this study, we show that oxygen-doping can be used as a new alloy design strategy for tailoring the mechanical behavior of the TiZrHfNbTa alloy: a novel low-density (7.98 g/cm3) ductile RHEA. Even though the material is a single-phase BCC with some oxides at room temperature, secondary BCC and HCP nano-lamellar structures start to form above 600 °C in addition to the nano-twins which are shown to be stable up to 1000 °C. This alloy shows superior strength and compressive ductility due to the nanoengineered microstructure. The present study sheds light on tailoring the strength-ductility balance in RHEAs by controlling the microstructure of novel RHEAs at the nanoscale via oxygen-doping.

KW - CALPHAD

KW - In-situ TEM

KW - Nano-lamellar structures

KW - Nanotwins

KW - Refractory High Entropy Alloys (RHEAs)

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DO - 10.1016/j.matdes.2022.111239

M3 - Article

AN - SCOPUS:85139850041

SN - 0264-1275

VL - 223.2022

JO - Materials and Design

JF - Materials and Design

IS - November

M1 - 111239

ER -

Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility

Abstract

Bibliographical note

Keywords

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