文献类型：期刊文献

中文题名：Achieving High Strength-plasticity of Nanoscale Lamellar Grain Extracted from Gradient Lamellar Nickel

作者：Zimeng Wang[1];Yunfei Jia[1];Yong Zhang[1];Pei Tang[1];Xiancheng Zhang[1];Shantung Tu[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

年份：2022

卷号：35

期号：4

起止页码：67

中文期刊名：Chinese Journal of Mechanical Engineering

外文期刊名：中国机械工程学报（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2021_2022】；

基金：Supported by National Key Research and Development Program of China(Grant No.2018YFC1902404);National Natural Science Foundation of China(Grant No.51975211,51725503);Innovation Program of Shanghai Municipal Education Commission(Grant No.2019-01-07-00-02-E00068);111 Project,Shanghai Rising-Star Program(Grant No.20QA1402500)。

语种：英文

中文关键词：Nanoscale lamellar structure;Compression test;Slip;Dislocation

摘要：Traditional metallic materials usually face a dilemma between high strength and poor strain hardening capacity.However,heterogeneous structured metallic materials have been found to obviously overcome the trade-of.Herein,gradient lamellar structure was fabricated through ultrasound-aided deep rolling technique in pure Ni with high stacking fault energy after heat treatment.The gradient lamellar Ni was successively divided into the four regions.In-situ micropillar compression tests were conducted in diferent regions to reveal the corresponding microscopic mechanical properties.Microscopic characterization techniques were performed to explore underlying deformation mechanisms and the efects of microstructural parameters on deformation behaviors.This work demonstrates that the micropillar with near nanoscale lamellar thickness possesses excellent strength and plasticity.On one hand,the reason for high strength of near nanoscale micropillar is that the strength of micropillar increases with the decrease of lamellar thickness according to the Hall-Petch efect.On the other hand,numerous lamellar grain boundaries perpendicular to the loading direction is found to hinder the motion of slip bands,resulting in great strain hardening capacity in the near nanoscale lamellar micropillar.