In-situ Tension of Dendrite-Reinforced Zr-based Metallic-Glass-Matrix Composites

doi:10.1007/s40195-014-0105-8

Abstract

Abstract:

The evolution of shear bands in the glassy matrix composites was observed and analyzed during in-situ tension. Based on the simple calculation, the temperature rise within the shear bands is sufficient to cause the formation of viscous shearing layer, resulting in the early failure. Zr-based metallic-glass-matrix composites (labeled as DH1 and DH2) exhibit improved tensile ductility rather than brittle failure, since the existence of secondary ductile dendrites promotes the impedance of prompt propagation of shear bands, evidenced by the multiplication of shear bands.

Key words: Amorphous alloy, Deformation behavior, Shear bands, Notch

Huijun Yang, Junwei Qiao, Song Wang, Yong Zhang. In-situ Tension of Dendrite-Reinforced Zr-based Metallic-Glass-Matrix Composites[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 621-626.

Figures/Tables 6

Fig. 1 Geometry morphology of the tensile sample

Fig. 2 Morphologies of the dendrite-amorphous composites DH1 a DH2 b

Fig. 3 XRD patterns of DH1 and DH2 composites, HRTEM of the matrix of DH1 composite is shown in the inset

Fig. 4 SEM images showing the shear bands forming and extending with increasing stress for DH1 during the tension: a 458 MPa; b 573 MPa; c 692 MPa; d 806 MPa

Fig. 5 SEM images showing the shear bands forming and extending with increasing stress for DH2 alloy during the tension: a 527 MPa; b 777 MPa; c 825 MPa; d 875 MPa; e 889 MPa

Fig. 6 Fracture surfaces of deformed DH1 a DH2 b composites, the inset in Fig. 6a indicating the lateral surface near the crack

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