Abnormal grain growth in ultrafine grained Ni under high-cycle loading. (1st March 2022)

• Record Type: Journal Article
• Authors: Barrios, Alejandro; Zhang, Yin; Maeder, Xavier; Castelluccio, Gustavo; Pierron, Olivier; Zhu, Ting
• Is Part Of: Scripta materialia. Number 209(2022)
• Publication Date: 2022-03-01
• Subjects: Abnormal grain growth -- High-cycle loading -- Micromechanics -- Ultrafine grained metal; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114372
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Abnormal grain growth can occur in polycrystalline materials with only a fraction of grains growing drastically to consume other grains. Here we report abnormal grain growth in ultrafine grained metal in a rarely explored high-cycle loading regime at ambient temperature. Abnormal grain growth is observed in electroplated Ni microbeams with average initial grain sizes less than 640 nm under a large number of loading cycles (up to 10 9 ) with low strain amplitudes (< 0.3%). Such abnormal grain growth occurs predominantly in the family of grains whose <100> orientation is along the tensile/compressive loading direction. Micromechanics analysis suggests that the elastic anisotropy of grains dictates the thermodynamic driving force of abnormal grain growth, such that the lowest strain energy density of the <100> oriented grain family dominates grain growth. This work unveils a unique type of abnormal grain growth that may be harnessed to tailor grain microstructures in materials. Graphical abstract: Image, graphical abstract