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三维超声场中实现了(FeCoNiCrMn)92Mo8高熵合金的动态凝固过程，研究了其组织演变规律和力学性能提升机制。静态凝固组织由FCC结构的初生γ相枝晶与四方结构的条状σ相组成。随着超声振幅的增加，瞬态空化大幅提升了初生γ相的形核率，使其晶粒发生显著细化。声流效应加速了固/液界面前沿溶质原子扩散，导致初生γ相中Cr和Mo元素含量降低，由此引发液相成分改变和(γ+σ)共晶组织形成。液相中Cr元素的进一步富集使凝固组织中出现了亚稳μ相。超声凝固条件下，合金压缩屈服强度最高可达876.2 MPa，比静态下提高了近2倍，同时保持了33.2%的变形量，(γ+σ)共晶组织形成及其体积分数增大是合金屈服强度提升的主导因素。Three-dimensional ultrasonic waves with amplitudes of 14, 18, and 22 μm were applied during the solidification of (FeCoNiCrMn)92Mo8 high-entropy alloy, and its microstructural evolution and mechanical property were investigated. Under static condition, the solidification microstructure was composed of primary γ phase dendrites with FCC structure and stripe-shaped σ phase with tetragonal structure. As the ultrasonic amplitude increased, the mean transient cavitation intensity rose to trigger a significant nucleation rate increase of the primary γ phase to 5.6×1012 m-3·s-1, leading to the remarkable grain size reduction by two orders of magnitude. The maximum and average acoustic streaming velocity increased concurrently, which accelerated atomic diffusion at the liquid/solid interface, reducing Cr content in the primary γ phase from 18.6 at.% to 13.1 at.% and Mo content from 6.8 at.% to 3.4 at.%. This atomic redistribution subsequently caused the liquid composition approaching the eutectic point and facilitated the formation of (γ+σ) eutecticss, which took up more than 50% volume fraction. The two eutectic phases exhibited a semi-coherent interface relationship characterized by (110)γ//(110)σ and (1-1-1)γ//(-110)σ. Furthermore, due to the progressive enrichment of Cr atoms in the remaint liquid phase, a small amount of metastable μ phase with Cr content up to 62.3 at.% formed in the final microstructure. The maximum compressive yield strength of the ultrasonically solidified microstructure reached 876.2 MPa, which was nearly twice of that for static solidification microstructure, and the compressive strain reached 33.2%. The formation of (γ+σ) eutectics represented as the dominant factor to contribute an enhancement of 527.1 MPa to the alloy's yield strength.
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Keywords:
- high-entropy alloy /
- ultrasonic solidification /
- eutectic microstructure /
- mechanical property
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