A new strategy for fabrication of unique heterostructured titanium laminates and visually tracking their synchronous evolution of strain partitions versus microstructure  

作　　者：Hao Ding Xiping Cui Zhiqi Wang Tao Zhao Yuchen Wang Yuanyuan Zhang Hongtao Chen Lujun Huang Lin Geng Junfeng Chen 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]Center for Analysis,Measurement and Computing,Harbin Institute of Technology,Harbin 150001,China [3]School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150080,China [4]School of Materials Science and Engineering,Fuzhou University,Fuzhou 350116,China

出　　处：《Journal of Materials Science & Technology》2022年第12期70-81,共12页材料科学技术（英文版）

基　　金：financially supported by the National Nature Science Foundation of China(Grant Nos.51771064,51971079,and 51501040)。

摘　　要：Heterostructured(HS)material with extraordinary mechanical properties has been regarded as one of the most promising structural materials.Here,we reported a new strategy for preparing heterostructured pure titanium laminates that possess a good combination of strength and ductility by combining gradient structure(GS)and heterogeneous lamella structure(HLS).The deformation characteristic versus microstructure evolution of GS/HLS titanium laminates,namely the strain partitions between different-sized grains(480–25μm)was visualized using a scanning electron microscope(SEM)equipped with electron backscattered diffraction(EBSD)mode combined with the digital image correlation(SEM-DIC)with an ultrahigh spatial resolution for the first time.As a result,the hetero-deformation of unique GS/HLS structure by the characteristic of strain partitions could be accurately captured.While the hetero-deformation could result in the hetero-deformation induced(HDI)stress strengthening and HDI hardening,which were regarded as the key reason that the resulting GS/HLS Ti laminates showed a superior combination of strength and ductility.This could promote a more in-depth understanding of the strengtheningtoughening mechanism of heterostructured material.

关 键 词：Gradient structure Heterogeneous lamella structure Digital image correlation Strain partition 

分 类 号：TG146.23[一般工业技术—材料科学与工程]