Effect of dislocation slip on in-situ tensile fracture of vanadium alloys after helium/self-ion irradiation
Qianqian Zhang, Shaoning Jiang, Yanfen Li, Shoushuai Zhang, Pengfei Zheng, Jianghai Lin, Guangchun Xiao
TL;DR
This study examines how dislocation slip affects the tensile fracture of vanadium alloys after helium and self-ion irradiation, using in-situ testing under a transmission electron microscope.
Contribution
The study reveals the interaction mechanisms between dislocation slip and irradiation-induced defects during deformation of V-4Cr-4Ti.
Findings
He+ and V+ ion irradiation generates dislocation loops and helium bubbles in V-4Cr-4Ti.
Dislocation slip occurs primarily along the (1 −1 0) plane during tensile deformation.
Fracture occurs along the (−1 −1 2) plane with minimal necking due to high yield stress.
Abstract
Research on tensile fracture of vanadium alloys after irradiation would help evaluate their mechanical properties and service life in extreme environments of fusion reactors, thereby ensuring the safety and reliability of the materials. This study investigated the effect of dislocation slip on the fracture of irradiated V-4Cr-4Ti through in-situ tensile testing under transmission electron microscopy (TEM). The results showed that He+ and V+ ions irradiation of V-4Cr-4Ti generated dislocations loops and helium bubbles. During subsequent in-situ tensile deformation, dislocation slip was the primary deformation mode under tensile load, while helium bubbles, due to size constraints, exhibited no significant deformation. During the loading process, multiple slip systems were activated. Based on the Critical resolved shear stress (CRSS) analysis, the slip primarily occurred along the (1 −1 0)…
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Taxonomy
TopicsFusion materials and technologies · Microstructure and mechanical properties · Ion-surface interactions and analysis