FCC-L12 ordering transformation in equimolar FeCoNiV multi-principal element alloy

Shubin Wang; Shihao Chen; Yiwang Jia; Zhi Hu; Haijun Huang; Zhibiao Yang; Anping Dong; Guoliang Zhu; Donghong Wang; Da Shu; Fuyang Tian; Yongbing Dai; Baode Sun

Materials & Design (Apr 2019)

FCC-L12 ordering transformation in equimolar FeCoNiV multi-principal element alloy

Shubin Wang,
Shihao Chen,
Yiwang Jia,
Zhi Hu,
Haijun Huang,
Zhibiao Yang,
Anping Dong,
Guoliang Zhu,
Donghong Wang,
Da Shu,
Fuyang Tian,
Yongbing Dai,
Baode Sun

Affiliations

Shubin Wang: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Shihao Chen: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Yiwang Jia: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Zhi Hu: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Haijun Huang: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Zhibiao Yang: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Anping Dong: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Materials Genome Initiative Center, Shanghai Jiao Tong University, Shanghai 200240, China
Guoliang Zhu: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Donghong Wang: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Da Shu: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Materials Genome Initiative Center, Shanghai Jiao Tong University, Shanghai 200240, China; Correspondence to: D. Shu, Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Fuyang Tian: Institute for Applied Physics, University of Science and Technology Beijing, Beijing 100083, China; Corresponding author.
Yongbing Dai: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Baode Sun: Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China

Journal volume & issue: Vol. 168

Abstract

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The ordered L12 phase generally appears as dispersed precipitates in FCC multi-principal element alloys (MPEAs). In this work, a single L12 ordered intermetallic is obtained in the annealed equimolar FeCoNiV alloy. Experiments show that the FCC to L12 ordering transformation occurs below 778±2 °C, accompanied by lattice contraction, anti-phase boundaries (APBs) formation and low-temperature magnetic moment decrease. A strong linear strain hardening rate up to 5.0 GPa is obtained during the tensile deformation for L12 ordered alloy at room temperature. The ab initio calculations based on the exact muffin‑tin orbitals in combination with coherent potential approximation predict that V atoms prefer to occupy the cubic corner positions of L12 sublattice, and the FCC phase becomes more stable with respect to L12 phase above 849 °C considering the competition between enthalpy and entropy. The ab initio molecular dynamic simulations indicate that V atoms prefer to bond with the unlike atoms (Fe, Co and Ni) in liquid FeCoNiV, which is consistent with the cubic corner site occupation of V in L12 ordered structure. The present work demonstrates a new design strategy of MPEAs which focus on single phase ductile intermetallic compounds. Keywords: High-entropy alloys, Ordering transformation, FeCoNiV, Ab initio calculations, Liquid structure

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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