Nanocrystallization of Cu<SUB>50</SUB>Zr<SUB>45</SUB>Ti<SUB>5</SUB> Metallic Glass Induced by Electron Irradiation

Abstract

The effect of electron irradiation on the structure of melt-spun Cu 50 Zr 45 Ti 5 metallic glass was investigated. Microstructural evolution during electron irradiation was examined by means of conventional and high-resolution transmission electron microscopy (CTEM and HRTEM) equipped with X-ray energy dispersive spectroscopy (EDS). The glassy phase was not stable under electron irradiation and crystalline nanoparticles with the monoclinic CuZr structure were formed. The volume fraction of the nanocrystalline phase increased with the electron dose while the average grain size remained at about 7 nm. This result indicates that electron irradiation is effective in producing nanocrystalline structures from the metallic glass.

Effect of Titanium on Microstructure and Mechanical Properties of Cu50Zr50−x Ti x (2.5 ≤ x ≤ 7.5) Glass Matrix Composites

“…The supercooled liquid region (DT x = T x -T g ), which is defined as the difference between the onset temperature of the first crystallization event (T x ) and the onset temperature of the glass transition (T g ), reaches a maximum value of 77 K for the Cu 50 Zr 45 Ti 5 alloy. The values measured for the onset temperatures of the glass transition and the first crystallization event, T g and T x , are in good agreement with the data reported for Cu 50 Zr 47.5 Ti 2.5 [8] and Cu 50 Zr 45 Ti 5 [9] ribbons earlier. All composite specimens show a high compressive yield strength in the range of 1753 MPa and a significant plastic strain (e p up to 15.3 pct) accompanied by more or less pronounced work hardening ( Figure 5).…”

“…[13,14] More recent results imply that the monoclinic martensitic phase can be also formed via electron irradiation of a glassy Cu 50 Zr 45 Ti 5 precursor. [9] Moreover, the unusual high plasticity of BMGs under compressive loading found for such alloys has been suggested to be an intrinsic property of the glassymartensitic matrix. [15] The present investigation of a series of alloys in the Cu-Zr-Ti system follows this line and supports the idea that the plastic strain of BMGs or BMG composites can be enhanced effectively by the ability to undergo a martensitic phase transformation.…”

“…THE binary Cu-Zr system [1,2] and its ternary derivatives such as Cu-Zr-Al [3][4][5] or Cu-Zr-Ti [6][7][8][9] with improved glass-forming ability have been intensively investigated. The addition of a third element enhances the glass-forming ability compared to binary Cu-Zr, [6,10] and, furthermore, the ternary alloys show high yield strength and a significant plastic deformability together with work-hardening-like behavior.…”

Phase Separation and Crystallization Induced by Electron Irradiation in Nanoscale Fe56.5Mn11Cr8.5Ni4Si10C10 Metallic Glass

“…The electron beam can stimulate and accelerate phase transformations in metastable materials [9]. For example, atomic rearrangement and crystallization can be driven by electron beam in amorphous carbon film [10], silica glass film [11] and Cu 50 Zr 45 Ti 5 metallic glass [12]. Additionally, electron beam can provide a more controllable energy source for phase transformations, in terms of accelerate voltage and current density.…”

Electron-Irradiation Induced Nanocrystallization of Pb(II) in Silica Gels Prepared in High Magnetic Field

“…Metallic glass of Neodium alloy (FeNdB) was nanocrystallized induced by EI [10][11][12]. Nanocrystallization of CuZrTi metallic glass by EI was investigated [13].…”