Enhanced tensile plasticity of a CuZr-based bulk metallic glass composite induced by ion irradiation

doi:10.1016/j.jmst.2019.06.003

Abstract

Abstract:

N⁺ ion irradiation is utilized to tune the structure and mechanical properties of a Cu₄₈Zr_47.2Al₄Nb_0.8 bulk metallic glass composite (BMGC). Ion irradiation increases the disorder near the surface, as probed by neutron diffraction, and, moreover, causes the phase transformation from B2 CuZr to B19’ CuZr martensitic phase in the studied BMGC. The tensile plasticity of the BMGC is dramatically improved after ion irradiation, which results from multiple shear banding on the surface and the martensitic transformation of the B2 to B19’ CuZr martensitic phase. The experimental results are strongly corroborated by complementary molecular dynamic simulations.

Key words: Bulk metallic glass composite, Ion irradiation, Neutron diffraction, Molecular dynamics simulation, Mechanical properties

Peng Xue, Simon Pauly, Weimin Gan, Songshan Jiang, Hongbo Fan, Zhiliang Ning, Yongjiang Huang, Jianfei Sun. Enhanced tensile plasticity of a CuZr-based bulk metallic glass composite induced by ion irradiation[J]. J. Mater. Sci. Technol., 2019, 35(10): 2221-2226.

Figures/Tables 5

Fig. 1. (a) Typically optical microscopy image of the CuZr-based BMGC sample showing a composite structure consisting of spherical crystalline phases embedded in featureless matrix and (b) neutron diffraction patterns of the as-cast and the ion irradiated BMGC samples, with inset highlighting the intensity ratio of the amorphous phase peak and the B19’ (020) peak to B2 (110) peak.

Fig. 2. (a) Depth of ions entering into the sample simulated by SRIM software, (b) FFT-filtered HRTEM image of irradiated sample surface revealing amorphization in the crystal induced by ion irradiation, and the typical results of the ACF calculation of (c) the as-cast samples and (d) the irradiated samples with a fluence of 2 × 1016 cm-2.

Fig. 3. TEM images of (a) the interface between the glassy matrix and the crystal of the as-cast sample and (b) the crystals in the irradiated sample indicating the B2 and B19′ CuZr phase.

Fig. 4. (a) Typical tensile stress-strain curves of the as-cast sample and the ion irradiated CuZr-based BMGC samples with different fluences, with inset showing the work-hardening rate of the samples. The surface morphologies of (b) the as-cast sample, and the ion irradiated sample with fluences of (c) 5 × 1015 cm-2, and (d) 2 × 1016 cm-2.

Fig. 5. Simulated structural configuration of (a) the as-cast CuZr-based BMGC sample, (b) the corresponding atomic strain field with 4% tensile strain, (c) the ion irradiated sample and (d) the corresponding atomic strain field with 4% tensile strain.

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