The gradual disappearance and re-appearance of yield drop by modulating the pre-strain history in a new zirconium alloy: Dislocation decomposition and recombination. (November 2020)

• Record Type: Journal Article
• Authors: Shi, Huigang; Li, Jiuxiao; Mao, Jianwei; Lu, Weijie
• Is Part Of: Scripta materialia. Number 188(2020)
• Page Start: 280
• Page End: 284
• Publication Date: 2020-11
• Subjects: Yield phenomena -- Pre-strain -- Zirconium alloy -- Dislocation -- Stress–strain curves; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.07.051
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We report an interesting phenomenon in a new zirconium alloy where the yield drop gradually disappeared and re-appeared by modulating the pre-strain history. The initial yield drop is caused by the lack of mobile dislocations in crystal, and increased density of mobile dislocations introduced by pre-strain (< 1%) lead to the disappearance of yield drop. The latter one can be explained by the recombination of partial dislocations. That is, the climb-dissociated partials introduced by pre-strain deformation (> 9%) recombine onto the same prism plane to regain its moving ability, resulting in the re-appearance of yield drop. Graphical abstract: Image, graphical abstract