Grain size effect on radiation tolerance of nanocrystalline Mo. (October 2016)

• Record Type: Journal Article
• Authors: Cheng, G.M.; Xu, W.Z.; Wang, Y.Q.; Misra, A.; Zhu, Y.T.
• Is Part Of: Scripta materialia. Volume 123(2016)
• Page Start: 90
• Page End: 94
• Publication Date: 2016-10
• Subjects: Radiation damage -- Body-centered cubic (bcc) -- Nanocrystalline -- Grain size effect -- Magnetron sputtering; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.06.007
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We report a significant grain size effect on radiation tolerance of nanocrystalline Mo under He ion irradiation. Irradiation-induced dislocation loops mainly contribute to the irradiation-induced hardening of Mo films with grain size of > 90 nm, while few such loops in those with grain size of < 90 nm. The hardness increment after irradiation decreases with decreasing the grain size, and approaches zero at the grain size of 25 nm. Also, the size and the density of irradiation-induced He bubbles decrease as the grain size decreases. This observation provides direct evidence that nanocrystalline body-centered-cubic metals have greater radiation tolerance than their ultra-fine-grained or coarse-grained counterparts. Graphical abstract: