Chen Chun-Liang, Lin Jyun-Hong
Department of Materials Science and Engineering, National Dong Hwa University, Hualien 97401, Taiwan.
Materials (Basel). 2023 Sep 13;16(18):6194. doi: 10.3390/ma16186194.
Refractory high-entropy alloys (RHEAs) are among the promising candidates for the design of structural materials in advanced nuclear energy systems. The effects of Cr, V, Ta, and Ti elements and ball milling on the microstructural evolution and mechanical properties of model RHEAs were investigated. The results show that W-rich BCC1 and Ta-rich BCC2 solid solution phases were generated after a long milling duration. After high-temperature sintering, the (Cr, Ta)-rich phase associated with the Laves phase was observed in the Cr-containing model RHEAs. In addition, a high level of Ti, Ta, and V contents promoted the in situ formation of oxide particles in the alloys. Complex TiTaO and TaVO oxide phases were identified by TEM, which suggests a solid-state reaction of Ti-O, Ta-O, and V-O subjected to high-energy ball milling. The oxide particles are uniformly dispersed in the BCC matrix, which can result in dispersion strengthening and the enhancement of mechanical properties.
难熔高熵合金（RHEAs）是先进核能系统中结构材料设计的有前途的候选材料之一。研究了Cr、V、Ta和Ti元素以及球磨对模型RHEAs微观结构演变和力学性能 的影响。结果表明，长时间球磨后生成了富W的BCC1和富Ta的BCC2固溶体相。高温烧结后，在含Cr的模型RHEAs中观察到与Laves相相关的富（Cr，Ta）相。此外，高含量的Ti、Ta和V促进了合金中氧化物颗粒的原位形成。通过TEM鉴定出了复杂的TiTaO和TaVO氧化物相，这表明在高能球磨作用下Ti-O、Ta-O和V-O发生了固态反应。氧化物颗粒均匀地分散在BCC基体中，这可导致弥散强化并提高力学性能。
