Huang Li, Sun Shuo, Xue Jianrong, Lin Xiaohui, Gao Xuanqiao, Li Yanchao, Li Jianfeng, Ma Chunfang, Zhang Wen
Northwest Institute for Nonferrous Metal Research, Xi'an, 710016, China.
School of Materials Science and Engineering, Xi'an Polytechnic University, China.
Heliyon. 2024 Nov 19;10(23):e40553. doi: 10.1016/j.heliyon.2024.e40553. eCollection 2024 Dec 15.
The He irradiation-induced mechanical and microstructural evolutions were studied in NbMoTaW (at.%) and NbMoTaWRe (at.%) refractory high-entropy alloys (RHEAs) films, respectively. The addition of Re reduces the yield stress, while improves the ductility in as-deposited NbMoTaW RHEA film. After He irradiation at room temperature, grain boundary brittleness is much severe in NbMoTaW RHEA film than in NbMoTaWRe RHEA film. The addition of Re enhances lattice distortion, leading amorphous regions with several nanometers forms in the grain boundaries in NbMoTaWRe RHEA film. In additionn, grain sizes in NbMoTaWRe RHEA are much smaller than in NbMoTaW RHEA. Excess volumes facilitate the annihilation of damages caused by He ions bombardment. He bubbles mainly distributes along grain boundaries in NbMoTaW RHEA film. The bubble size decreases and becomes hard to discern in NbMoTaWRe RHEA film. Thus, hardening effect induced by He irradiation is less obvious in NbMoTaWRe than in NbMoTaW RHEA film. In summary, the addition of Re to NbMoTaW RHEA effectively improves irradiation-resistance.
分别研究了氦辐照对NbMoTaW（原子百分比）和NbMoTaWRe（原子百分比）难熔高熵合金（RHEA）薄膜的力学和微观结构演变的影响。添加Re降低了沉积态NbMoTaW RHEA薄膜的屈服应力，同时提高了其延展性。室温下进行氦辐照后，NbMoTaW RHEA薄膜中的晶界脆性比NbMoTaWRe RHEA薄膜严重得多。添加Re增强了晶格畸变，导致NbMoTaWRe RHEA薄膜的晶界中形成了几纳米的非晶区域。此外，NbMoTaWRe RHEA的晶粒尺寸比NbMoTaW RHEA小得多。过量的体积有助于消除氦离子轰击造成的损伤。氦气泡主要分布在NbMoTaW RHEA薄膜的晶界处。在NbMoTaWRe RHEA薄膜中，气泡尺寸减小且难以辨别。因此，氦辐照引起的硬化效应在NbMoTaWRe中比在NbMoTaW RHEA薄膜中不太明显。总之，向NbMoTaW RHEA中添加Re有效地提高了抗辐照性能。
