Remarkable ductility in metastable refractory high entropy alloys via BCC-FCC/α″ martensitic transformations

Liang Wang; Xudong Liu; Chunxi Li; Minzheng Yang; Benpeng Wang; Kaisheng Ming; Shijian Zheng; Jun Liang; Yunfei Xue

doi:10.1063/5.0064897

Remarkable ductility in metastable refractory high entropy alloys via BCC-FCC/α″ martensitic transformations

Liang Wang, Xudong Liu, Chunxi Li, Minzheng Yang, Benpeng Wang, Kaisheng Ming, Shijian Zheng, Jun Liang, Yunfei Xue^*

^*Corresponding author for this work

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

5 Citations (Scopus)

Abstract

Designing metastable refractory high entropy alloys (RHEAs) with transformation induced plasticity (TRIP) effects is an effective approach for solving the low ductility of RHEAs. However, the traditional martensitic transformations (MTs) in RHEAs generally result in limited ductility improvement. In the present work, we designed a metastable RHEA Zr2Hf4Nb0.5Ta (Nb7Ta13) with severe lattice distortion, and two MTs, BCC-to-FCC/α″, were found in Nb7Ta13. During tension deformation, BCC-to-FCC/α″ MTs appeared after yielding, causing the TRIP effect; after the MTs are completed, the FCC martensite showed excellent deformability and effectively promoted the following deformation of Nb7Ta13. Finally, Nb7Ta13 RHEAs show a remarkable ductility (∼60%). By analyzing the variation of interplanar spacing and interatomic spacing during DIMTs, we believed that the FCC martensite is generated by relaxing the lattice distortion.

Original language	English
Article number	151902
Journal	Applied Physics Letters
Volume	119
Issue number	15
DOIs	https://doi.org/10.1063/5.0064897
Publication status	Published - 11 Oct 2021

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title = "Remarkable ductility in metastable refractory high entropy alloys via BCC-FCC/α″ martensitic transformations",

abstract = "Designing metastable refractory high entropy alloys (RHEAs) with transformation induced plasticity (TRIP) effects is an effective approach for solving the low ductility of RHEAs. However, the traditional martensitic transformations (MTs) in RHEAs generally result in limited ductility improvement. In the present work, we designed a metastable RHEA Zr2Hf4Nb0.5Ta (Nb7Ta13) with severe lattice distortion, and two MTs, BCC-to-FCC/α″, were found in Nb7Ta13. During tension deformation, BCC-to-FCC/α″ MTs appeared after yielding, causing the TRIP effect; after the MTs are completed, the FCC martensite showed excellent deformability and effectively promoted the following deformation of Nb7Ta13. Finally, Nb7Ta13 RHEAs show a remarkable ductility (∼60%). By analyzing the variation of interplanar spacing and interatomic spacing during DIMTs, we believed that the FCC martensite is generated by relaxing the lattice distortion.",

author = "Liang Wang and Xudong Liu and Chunxi Li and Minzheng Yang and Benpeng Wang and Kaisheng Ming and Shijian Zheng and Jun Liang and Yunfei Xue",

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AU - Wang, Liang

AU - Liu, Xudong

AU - Li, Chunxi

AU - Yang, Minzheng

AU - Wang, Benpeng

AU - Ming, Kaisheng

AU - Zheng, Shijian

AU - Liang, Jun

AU - Xue, Yunfei

PY - 2021/10/11

Y1 - 2021/10/11

N2 - Designing metastable refractory high entropy alloys (RHEAs) with transformation induced plasticity (TRIP) effects is an effective approach for solving the low ductility of RHEAs. However, the traditional martensitic transformations (MTs) in RHEAs generally result in limited ductility improvement. In the present work, we designed a metastable RHEA Zr2Hf4Nb0.5Ta (Nb7Ta13) with severe lattice distortion, and two MTs, BCC-to-FCC/α″, were found in Nb7Ta13. During tension deformation, BCC-to-FCC/α″ MTs appeared after yielding, causing the TRIP effect; after the MTs are completed, the FCC martensite showed excellent deformability and effectively promoted the following deformation of Nb7Ta13. Finally, Nb7Ta13 RHEAs show a remarkable ductility (∼60%). By analyzing the variation of interplanar spacing and interatomic spacing during DIMTs, we believed that the FCC martensite is generated by relaxing the lattice distortion.

AB - Designing metastable refractory high entropy alloys (RHEAs) with transformation induced plasticity (TRIP) effects is an effective approach for solving the low ductility of RHEAs. However, the traditional martensitic transformations (MTs) in RHEAs generally result in limited ductility improvement. In the present work, we designed a metastable RHEA Zr2Hf4Nb0.5Ta (Nb7Ta13) with severe lattice distortion, and two MTs, BCC-to-FCC/α″, were found in Nb7Ta13. During tension deformation, BCC-to-FCC/α″ MTs appeared after yielding, causing the TRIP effect; after the MTs are completed, the FCC martensite showed excellent deformability and effectively promoted the following deformation of Nb7Ta13. Finally, Nb7Ta13 RHEAs show a remarkable ductility (∼60%). By analyzing the variation of interplanar spacing and interatomic spacing during DIMTs, we believed that the FCC martensite is generated by relaxing the lattice distortion.

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JO - Applied Physics Letters

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Remarkable ductility in metastable refractory high entropy alloys via BCC-FCC/α″ martensitic transformations

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