|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||P10: FCC to L12 Ordering Transformation in Equimolar FeCoNiV High Entropy Alloy
||Shubin Wang, Da Shu, Fuyang Tian, Yongbing Dai, Baode Sun
|On-Site Speaker (Planned)
The ordered L12 phase generally appears as dispersed precipitates in high entropy alloys (HEAs). In this work, a single L12 ordered intermetallic is obtained in the annealed equimolar FeCoNiV alloy. This FCC to L12 ordering transformation causes the lattice contraction and anti-phase boundaries formation. It also decreases the low-temperatrue magnetic moment and leads to a high linear strain hardening rate (up to 5.0 GPa). The ab initio calculations based on the EMTO-CPA predict that the L12 phase becomes more stable with respect to FCC phase below 849 °C with V atoms preferring to occupy the cubic corner sites of L12 sublattice. This sublattice atomic occupation can be traced back to the short-range order (V atoms prefer to bond with the Fe, Co and Ni atoms) in liquid FeCoNiV alloy. The present work demonstrates a new design strategy of HEAs which focus on multicomponent but ductile intermetallic compounds.