Irradiation effects of medium-entropy alloy NiCoCr with and without pre-indentation

JOURNAL OF NUCLEAR MATERIALS

卷:524

Article

Lu, Chenyang¹  Yang, Tai-Ni¹  Jin, Ke²  Velisa, Gihan²  Xiu, Pengyuan¹  Peng, Qing¹  Gao, Fei¹  Zhang, Yanwen^2,3  Bei, Hongbin²  Weber, William J.^2,3  Wang, Lumin^1,4 

[1] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[4] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

关键词: Medium entropy alloy;    Void swelling;    Structural complexity;    Ion beam irradiation;   

DOI  :  10.1016/j.jnucmat.2019.06.020

来源: Elsevier

【 摘 要 】

Medium entropy alloy NiCoCr draws great attention due to its excellent strength-ductility trade-off mechanical behavior. Its irradiation behavior at elevated temperatures has been investigated using ion beam irradiation in a temperature range of 420-580 degrees Cand transmission electron microscopy. Irradiation induced stacking fault tetrahedra were only observed at 420 degrees C. With increasing irradiation temperature, all stacking fault tetrahedra vanished, while the size of voids and dislocation loops increased significantly. Nanoindentation-induced structural complexities, including dislocations, stacking faults and twins helped to reduce void swelling. However, at the elevated temperatures, NiCoCr is still much more susceptible to void swelling compared to high entropy alloys such as NiCoFeCrMn and NiCoFeCrPd. Published by Elsevier B.V.

【 授权许可】

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