文献类型：期刊文献

英文题名：Elucidating the Effect of Gradient Structure on Strengthening Mechanisms and Fatigue Behavior of Pure Titanium

作者：Li, Xiao[1]; Sun, Bin-Han[2]; Guan, Bo[3]; Jia, Yun-Fei[1]; Gong, Cong-Yang[1]; Zhang, Xian-Cheng[1]; Tu, Shan-Tung[1]

机构：[1] Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Stra?e 1, Düsseldorf, 40237, Germany; [3] School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

年份：2020

外文期刊名：SSRN

收录：EI(收录号：20210185483)

语种：英文

外文关键词：Coarsening - Deformation - Fatigue testing - Grain refinement - Grain size and shape - High-cycle fatigue - Nanocrystals - Titanium - Twinning

摘要：Gradient nanostructured (GNS) layer was fabricated on the pure titanium using ultrasonic surface rolling process. With the coaction of deformation twinning, phase transformation and dislocation slip, spatial gradient of grain size distribution was formed. Nanocrystalline and amorphous phase exist simultaneously on the top surface. The effect of grain refinement, dislocation density and deformation twinning on strength was analyzed quantitatively. Stress-controlled fatigue tests showed that an enhanced fatigue strength was achieved on the GNS Ti due to the synergetic effect of microstructure and unique mechanical properties. The primary mechanism was fatigue induced grain coarsening sustained the cumulative plastic strain during cyclic deformation and the GNS layer could change the crack initiation mode. ? 2020, The Authors. All rights reserved.