Alshafey Mostafa, Megahed H, El-Hadad Shimaa, Sato Hisashi, Z Mohamed Lamiaa
Mechanical Design and Production Engineering Department, Faculty of Engineering, Cairo University, Giza, 12613, Egypt.
Central Metallurgical Research and Development Institute (CMRDI), P.O. 87, Helwan, Egypt.
Sci Rep. 2024 Nov 29;14(1):29713. doi: 10.1038/s41598-024-78854-w.
In the current investigation, elemental boron was added to form a series of TiNbZrNiCoFeB Compositionally Complex Alloys (CCAs). Alloying was done via vacuum arc melting in amounts of 0.0, 5.3, and 10.6 at.%. From the thermodynamic parameters, adding B to the base alloy increased the system's entropy. The microstructure of the prepared CCAs was characterized using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction (XRD). The mechanical properties of CCAs as related to microstructure were assessed. According to XRD results, B-based intermetallic phases were obtained in the prepared CCAs, which were binary as TiB and ZrB and ternary as FeNbB and NbCoB. These intermetallic phases notably provided strengthening effects to the B-added alloys. TiNbZrNiCoFeB CCA showed the most homogenous microstructure obtained by the arc melting process. Adding B increased Young's modulus from 141 GPa (without B) to 195 GPa and 260 GPa with 5.3 and 10.6 at.%B, respectively. Hardness also increased from 502 to 606 HV with 5.3 at.% B and to 648 HV with 10.6 at.%B. Accordingly, the wear resistance increased with B addition where 10.6 at.%B sample showed the lowest wear rate among the other conditions. However, 5.3 at.% B was nominated as the optimum addition amount due to its notable microstructure homogeneity.
在当前的研究中，添加了元素硼以形成一系列TiNbZrNiCoFeB成分复杂合金（CCA）。通过真空电弧熔炼进行合金化，添加量分别为0.0、5.3和10.6原子百分比。从热力学参数来看，向基础合金中添加硼增加了系统的熵。使用扫描电子显微镜、透射电子显微镜和X射线衍射（XRD）对制备的CCA的微观结构进行了表征。评估了与微观结构相关的CCA的力学性能。根据XRD结果，在制备的CCA中获得了基于硼的金属间相，二元相有TiB和ZrB，三元相有FeNbB和NbCoB。这些金属间相对添加硼的合金具有显著的强化作用。TiNbZrNiCoFeB CCA呈现出通过电弧熔炼工艺获得的最均匀的微观结构。添加硼使杨氏模量分别从141 GPa（无硼）增加到含5.3原子百分比硼时的195 GPa和含10.6原子百分比硼时的260 GPa。硬度也从502 HV增加到含5.3原子百分比硼时的606 HV以及含10.6原子百分比硼时的648 HV。因此，随着硼的添加耐磨性增加，其中含10.6原子百分比硼的样品在其他条件中显示出最低的磨损率。然而，由于其显著的微观结构均匀性，5.3原子百分比硼被指定为最佳添加量。
