TY - JOUR
T1 - Remarkable ductility in metastable refractory high entropy alloys via BCC-FCC/α″ martensitic transformations
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
N1 - Publisher Copyright:
© 2021 Author(s).
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.
UR - https://www.scopus.com/pages/publications/85117147824
U2 - 10.1063/5.0064897
DO - 10.1063/5.0064897
M3 - Article
AN - SCOPUS:85117147824
SN - 0003-6951
VL - 119
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 15
M1 - 151902
ER -