文献类型：期刊文献

英文题名：Strain gradient-driven microstructural evolution and strengthening mechanisms in post-riveting bulged region of A286 superalloy blind rivets

作者：Tao, Liang Feng, Zhiguo Jiang, Yulian Lu, Rengang Mo, Ningning

第一作者：陶亮;Tao, Liang

机构：[1] School of Mechanical Engineering, Guizhou University, Guizhou province, Guiyang, 550025, China; [2] Guizhou Key Laboratory of Special Equipment and Manufacturing Technology, Guizhou University, Guizhou province, Guiyang, 550025, China; [3] School of Mechanical Engineering, Guizhou Institute of Technology, Guizhou province, Guiyang, 550025, China

第一机构：School of Mechanical Engineering, Guizhou University, Guizhou province, Guiyang, 550025, China

年份：2025

卷号：343

外文期刊名：Journal of Materials Processing Technology

收录：EI(收录号：20252918800739);Scopus(收录号：2-s2.0-105010697026)

语种：英文

外文关键词：Aluminum alloys - Grain refinement - Microstructural evolution - Plastic deformation - Riveting - Rivets - Strengthening (metal) - Transmission electron microscopy - Vickers hardness testing

摘要：The post-riveting bulged region is a critical zone of concentrated plastic deformation, where complex microstructural changes directly govern riveted joint performance. Nonetheless, the strengthening mechanisms operating in this region remain poorly understood. This study aims at exploring the microstructural evolution and strengthening mechanisms of the post-riveting bulged region in A286 superalloy blind rivets. Riveting tests and numerical simulations were carried out on aluminum alloy sheets of varying thickness to investigate the plastic deformation behavior of the bulged region. Optical microscopy, electron backscatter diffraction, transmission electron microscopy, and Vickers hardness tests were conducted to characterize the microstructure and mechanical properties. A multiscale analytical framework linking strain gradient, microstructural evolution, and mechanical properties, was developed, revealing the critical role of strain gradient-driven grain reconstruction and dislocation evolution in localized strengthening. The central bulged region experienced the most severe plastic deformation, with the true strain increasing from 0.355 at the periphery to 0.407 near the rivet hole. This strain gradient induced a transformation from coarse equiaxed grains (2.5 μm) to refined fibrous grains (1.03 μm), along with a marked increase in dislocation density. Yield strength enhancement is attributed to the synergistic effects of grain refinement and dislocation strengthening, with dislocation strengthening contributing most significantly (53.3–57.3 %). The developed analytical framework demonstrates strong generalizability and provides a robust theoretical basis for microstructural control and mechanical property optimization in riveted joints. Moreover, it offers a novel perspective for exploring microstructure–property relationships in other metallic joining systems. ? 2025 Elsevier B.V.