当前位置: X-MOL 学术Intermetallics › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Mobility of point defects in CoCrFeNi-base high entropy alloys
Intermetallics ( IF 4.4 ) Pub Date : 2021-03-24 , DOI: 10.1016/j.intermet.2021.107182
Naoyuki Hashimoto , Yuta Ono

The in-situ observation of microstructural evolution under electron irradiation was performed in order to experimentally estimate the mobility of vacancy and interstitial in 316 stainless steel and CoCrFeNi-base high entropy alloys. The vacancy migration energy in CoCrFeNiMn and CoCrFeNiAl0.3 was estimated to be lower and higher compared with that in 316 stainless steel, respectively. While, the interstitial migration energy in those alloys seems to be almost the same. The increase in vacancy migration energy in CoCrFeNiAl0.3 is probably due to a strong interaction between vacancy and Al. The positron annihilation analysis revealed that vacancies might exist close to Co and Ni atoms in CoCrFeNi-base high entropy alloys. In addition, vacancies could also be captured by Mn and Al atoms in CoCrFeNiMn and CoCrFeNiAl0.3, respectively. The electron- and ion-irradiation at 400 and 300 °C up to 1.5 dpa resulted in the precipitation of the intermetallic compounds, such as CoFe, NiFe in CoCrFeNiMn, and Ni3Al in CoCrFeNiAl0.3. From these results, it is suggested that Co, Ni, Mn, and Al atoms could affect the vacancy mobility in HEAs, leading to the delay of microstructural evolution and the enhancement of precipitation under irradiation.



中文翻译:

CoCrFeNi基高熵合金中点缺陷的迁移性

为了在实验上估计316不锈钢和CoCrFeNi基高熵合金中空位和间隙的迁移率,进行了电子辐照下显微组织演化的原位观察。据估计,与316不锈钢相比,CoCrFeNiMn和CoCrFeNiAl 0.3中的空位迁移能分别较低和较高。同时,这些合金中的间隙迁移能似乎几乎相同。CoCrFeNiAl 0.3中空位迁移能的增加可能是由于空缺和Al之间有很强的相互作用。正电子an没分析表明,在CoCrFeNi基高熵合金中,Co和Ni原子附近可能存在空位。此外,CoCrFeNiMn和CoCrFeNiAl 0.3 0.3中的Mn和Al原子也可以分别捕获空位。在400和300°C高达1.5 dpa的电子和离子辐射导致金属间化合物的沉淀,例如CoFe,CoCrFeNiMn中的NiFe和CoCrFeNiAl 0.3中的Ni 3 Al 。从这些结果表明,Co,Ni,Mn和Al原子可能会影响HEA中的空位迁移率,从而导致微结构演化的延迟和辐照下沉淀的增加。

更新日期:2021-03-24
down
wechat
bug