Abstract
Metallic glasses, with their short-range order structure, exhibit unique characteristics that do not exist in the corresponding crystalline alloys with the same compositions. These unusual properties are attributed to the absence of translational periodicity, grain boundaries, and compositional homogeneity. Cobalt (Co)-based metallic glassy alloys have been receiving great attention due to their superior mechanical and magnetic properties. Unluckily, Co-Ti alloys and its based alloys are difficult to be prepared in glassy form, due to their rather poor glass-forming ability. In the present work, the mechanical alloying approach was employed to investigate the possibility of preparing homogeneous (Co75Ti25)100−xBx starting from elemental powders. The feedstock materials with the desired compositions were high-energy ball-milled under argon atmosphere for 50 h. The end products of the powders obtained after milling revealed a short-range order structure with a broad amorphization range (2 at% ≤ B ≤ 25 at%). The behaviors of these glassy systems, characterized by the supercooled liquid region, and reduced glass transition temperature, were improved upon increasing B molar fraction. The results had shown that when B content increased, the saturation magnetization was increased, where coercivity was decreased.
Highlights
Life in the 21st century cannot depend on limited groups of materials; instead, it is dependent on unlimited families of advanced materials [1]
Due to the absence of deep eutectic compositions in the Co-Ti binary phase diagram, it is very difficult to obtain a metallic glassy phase for this system and its based alloys, using the melting and casting and melt spinning techniques. This is in contrast to the Co-Zr binary system, which possesses several deep eutectic compositions, allowing a wide glass-formation range
The present work has been addressed in part to employ the mechanical alloying (MA) approach for preparing metallic glasses of ternary (Co75 Ti25 )100−x Bx systems in a very wide range of (2 ≤ x ≤ 30 at%), using high-energy ball milling technique
Summary
Life in the 21st century cannot depend on limited groups of materials; instead, it is dependent on unlimited families of advanced materials [1]. Despite the traditional categories of materials, which may not completely match with the modern industrial requirements, a rather newcomer so-called “metallic glass” [2] has found an important space in the functional classifications of metals and metal alloys [3] Metallic glasses, with their short-range order structure, possess exciting properties which are of interest for basic solid-state physics, and for metallurgy, surface chemistry, and technology [4,5]. A large elastic flexibility guarantees excellent insensitivity concerning plastic deformations and a small electrical conductivity reduces the eddy-current losses [17] Due to their poor glass-forming ability (GFA) and the absence of any deep eutectic compositions in the equilibrium phase diagram, it is very difficult to prepare Co-based metallic glassy alloys [18]. The iron contamination analyzed by the ICP technique was in the range between 0.05 to 0.23 at%
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