Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders.
Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders.
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高活性球形TaNbTiZr耐火高熵合金粉末的制备及显微组织
DOI：
10.3390/ma16020791
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发表时间：
2023-01-13
期刊：
影响因子：
3.4
通讯作者：
Liu, Bin
中科院分区：
文献类型：
--
作者：
Gao, Shenghan;Fu, Ao;Xie, Zhonghao;Liao, Tao;Cao, Yuankui;Liu, Bin
采用等离子旋转电极法（PREP）和电极感应熔化气体雾化法（EIGA）制备了高活性球形TaNbTiZr高熵合金（REHA）粉末。EIGA和PREPed的TaNbTiZr RHEA粉末都具有单相体心立方（BCC）结构和低氧含量。与EIGA制备的粉体相比，PREPe制备的粉体具有更高的球形度和更光滑的表面，但粒径较大。EIGA和PREPe粉末的平均粒径分别为51.8和65.9 μm。粗粉和粗粉均具有枝晶结构，粗粉枝晶尺寸大于粗粉。理论计算表明，PREPe粉末在凝固过程中的冷却速率比EIGA粉末高一个数量级，枝晶组织在EIGA过程中有更多的时间生长，这是EIGA粉末枝晶尺寸较粗的主要原因。
High-activity spherical TaNbTiZr refractory high-entropy alloy (REHA) powders were successfully prepared by electrode induction melting gas atomization (EIGA) and plasma rotating electrode process (PREP) methods. Both the EIGAed and PREPed TaNbTiZr RHEA powders have a single-phase body-centered cubic (BCC) structure and low oxygen content. Compared with the EIGAed powders, the PREPed powders exhibit higher sphericity and smoother surface, but larger particle size. The average particle sizes of the EIGAed and PREPed powders are 51.8 and 65.9 μm, respectively. In addition, both the coarse EIGAed and PREPed powders have dendritic structure, and the dendrite size of the EIGAed powders is larger than that of the PREPed powders. Theoretical calculation indicates that the cooling rate of the PREPed powders is one order of magnitude higher than that of the EIGAed powders during the solidification process, and the dendritic structure has more time to grow during EIGA, which is the main reason for the coarser dendrite size of the EIGAed powders.
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