J. Mater. Sci. Technol. ›› 2022, Vol. 107: 70-81.DOI: 10.1016/j.jmst.2021.08.016

• Research Article • Previous Articles     Next Articles

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

Hao Dinga, Xiping Cuia,b,*(), Zhiqi Wanga, Tao Zhaoa, Yuchen Wanga, Yuanyuan Zhanga, Hongtao Chenc, Lujun Huanga,*(), Geng Lina, Junfeng Chend,*()   

  1. aSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
    bCenter for Analysis, Measurement and Computing, Harbin Institute of Technology, Harbin 150001, China
    cSchool of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China
    dSchool of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China
  • Received:2021-04-09 Revised:2021-08-16 Accepted:2021-08-17 Published:2022-04-30 Online:2022-04-28
  • Contact: Xiping Cui,Lujun Huang,Junfeng Chen
  • About author:chenjunfeng@fzu.edu.cn (J. Chen).
    huanglujun@hit.edu.cn (L. Huang)
    **E-mail addresses: cuixiping@hit.edu.cn (X. Cui)
    First author contact:1These authors contributed equally to this work.

Abstract:

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 (480-25 μm) 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 strengthening-toughening mechanism of heterostructured material.

Key words: Gradient structure, Heterogeneous lamella structure, Digital image correlation, Strain partition