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 gradi-ent structure(GS)and heterogeneous lamella structure(HLS).The deformation characteristic versus mi-crostructure 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 struc-ture 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 combina-tion of strength and ductility.This could promote a more in-depth understanding of the strengthening-toughening mechanism of heterostructured material.
NETL
NSTL
维普
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