New ductile laminate structure of Ti-alloy/Ti-based metallic glass composite with high specific strength

doi:10.1016/j.jmst.2017.07.008

Abstract

Abstract:

Bulk laminate structure of Ti-alloy/Ti-based metallic glass composite (MGC) was prepared by melting a preform of alternate stack-up foils in the high vacuum atmosphere. The composite demonstrates a good combination of yield strength (～1618 MPa), plasticity (～4.3%) and specific fracture strength (384 × 10³ N m kg^-1) in compression. The maintained yield strength results from the unique microstructure composed of the Ti layer, the solution layer with gradient structure and the MGC layer. Such a multilayer structure effectively inhibits the propagation of shear band, leading to the enhanced plasticity. Those extraordinary properities suggest that combining ductile lamella with brittle metallic glass (MG) by such a lay-up method can be an effective way to improve mechanical properties of MG.

Key words: Laminate composite, Metallic glass, Specific strength, Plasticity

D. Li, Z.W. Zhu, A.M. Wang, H.M. Fu, H. Li, H.W. Zhang, H.F. Zhang. New ductile laminate structure of Ti-alloy/Ti-based metallic glass composite with high specific strength[J]. J. Mater. Sci. Technol., 2018, 34(4): 708-712.

Figures/Tables 4

Fig. 1. (a) XRD patterns of as-prepared laminate composite, as-quenched ZT-3 ribbon and commercial Ti ribbon, microstructure of as-prepared laminate composite showing (b) uniformly distributed ZT-3 and Ti ribbon, (c) pure Ti layer, transition zone and MGC layer inset with the composition variation between adjacent layers and (d) transition zone in higher resolution, (e)-(g) bright-field TEM images corresponding to Zone I-IV marked in (d), respectively.

Fig. 2. (a) Schematic of loading direction of compression and bending test, (b) typical stress-strain curves for ZT-3 and Ti-alloy/Ti-based-MGCs in compression tests, (c) specific fracture strength (fracture strength σf to density ρ) of Ti-alloy/Ti-based-MGC together with monolithic ZT-3 and other types of materials and (d) typical stress-deflection curves for ZT-3 and Ti-alloy/Ti-based-MGC under bending.

Fig. 3. SEM micrographs of profiles of compression fractured samples at low (a) and high (b) magnification, respectively, SEM micrographs of shear band morphologies on tensile (c) and compressive (d) surfaces of bend fractured samples, respectively.

Fig. 4. Cross-sectional schematic illustration of propagation of SBs inhibited by Ticp lamella: (a) primary initiation of shear bands; (b)-(d) propagation and multiplication processes of shear bands inhibited by Ti solution layer, pure Ti layer and stretch of pure Ti layer, respectively.

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