Microstructure and properties of NbVZr refractory complex concentrated alloys
Microstructure and properties of NbVZr refractory complex concentrated alloys
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DOI：
10.1016/j.actamat.2021.116919
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发表时间：
2021-05
期刊：
影响因子：
9.4
通讯作者：
Mu Li;Zhaohan Zhang;A. Thind;G. Ren;Rohan Mishra;K. Flores
中科院分区：
文献类型：
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作者：
Mu Li;Zhaohan Zhang;A. Thind;G. Ren;Rohan Mishra;K. Flores
报道了等原子NbVZr合金的显微组织和力学性能。激光处理和铸态样品均表现出枝晶BCC固溶体，在枝晶间区域具有六方C14和立方C15 Laves相。基于第一性原理总能量计算讨论了Laves相的稳定性。发现Nb增加了C14和C15相的稳定性。Laves相通过充当位错运动的障碍物来增强材料，如通过变形样品的纳米压痕和TEM观察所证明的。在Laves区域中观察到高浓度的堆垛层错，这证实了第一原理计算预测的低堆垛层错能量，并且预计会导致额外的塑性。这项工作作为一个例子，系统研究的稳定性的金属间化合物相在难熔复杂的集中合金使用高通量的合成技术。这些相在合金的整体机械性能中起重要作用。
The microstructure and mechanical properties of the equiatomic NbVZr alloy are reported. The laser-processed and as-cast samples both exhibit a dendritic BCC solid solution with hexagonal C14 and cubic C15 Laves phases in the interdendritic regions. The stability of the Laves phases is discussed based on first-principles total energy calculations. Nb is found to increase the stability of C14 and C15 phases. The Laves phases strengthen the material by acting as obstacles to dislocation motion, as evidenced by nanoindentation and TEM observations of deformed samples. A high concentration of stacking faults was observed in the Laves region, which confirms the low stacking fault energy predicted by first-principles calculations, and are expected to result in additional plasticity. This work serves as an example of a systematic study of the stability of intermetallic phases in refractory complex concentrated alloys using a high-throughput synthesis technique. Such phases play an important role in the overall mechanical properties of the alloy.