title: Revealing extraordinary tensile plasticity in layered Ti-Al metal composite.
abstract: Layered Ti-Al metal composite (LMC) fabricated by hot-pressing and hot-rolling process displays higher ductility than that of both components. In this paper, a combination of digital image correlation (DIC) and X-ray tomography revealed that strain delocalization and constrained crack distribution are the origin of extraordinary tensile ductility. Strain delocalization was derived from the transfer of strain partitioning between Ti and Al layer, which relieved effectively the strain localization of LMC. Furthermore, the extensive cracks of LMC were restricted in the interface due to constraint effect. Layered architecture constrained the distribution of cracks and significantly relieved the strain localization. Meanwhile, the transfer of strain partitioning and constrained crack distribution were believed to inhibit the strain localization of Ti and change the deformation mechanisms of Ti. Our finding enriches current understanding about simultaneously improving the strength and ductility by structural design.
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: M
authors.initials: M
authors.lastname: Huang
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: G H
authors.initials: GH
authors.lastname: Fan
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: L
authors.initials: L
authors.lastname: Geng
authors.affiliation: School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150001, P. R. China.
authors.forename: G J
authors.initials: GJ
authors.lastname: Cao
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Y
authors.initials: Y
authors.lastname: Du
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: H
authors.initials: H
authors.lastname: Wu
authors.affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: T T
authors.initials: TT
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116000, P. R. China.
authors.forename: H J
authors.initials: HJ
authors.lastname: Kang
authors.affiliation: School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116000, P. R. China.
authors.forename: T M
authors.initials: TM
authors.lastname: Wang
authors.affiliation: Shanghai Synchrotron Radiation Facility, Shanghai Institute of High Energy Applied Physics, Shanghai, 200000, P. R. China.
authors.forename: G H
authors.initials: GH
authors.lastname: Du
authors.affiliation: Shanghai Synchrotron Radiation Facility, Shanghai Institute of High Energy Applied Physics, Shanghai, 200000, P. R. China.
authors.forename: H L
authors.initials: HL
authors.lastname: Xie