Nanotechnology and Applications Program, Energy and Building Research Center, Kuwait Institute for Scientific Research, Safat 13109, Kuwait.
Molecules. 2020 Jul 23;25(15):3338. doi: 10.3390/molecules25153338.
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 (CoTi)B 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.
金属玻璃具有短程有序结构，表现出与具有相同成分的相应晶态合金不同的独特特性。这些不寻常的性质归因于缺乏平移周期性、晶界和成分均匀性。由于其优异的机械和磁性能，基于钴 (Co) 的金属玻璃合金受到了极大的关注。不幸的是，由于较差的玻璃形成能力，Co-Ti 合金及其基合金很难以玻璃形式制备。在本工作中，采用机械合金化方法研究了从元素粉末制备均匀 (CoTi)B 的可能性。将具有所需成分的原料在氩气气氛下高能球磨 50 小时。球磨后获得的粉末的最终产物具有短程有序结构和较宽的非晶形成范围（2 at% ≤ B ≤ 25 at%）。这些玻璃态体系的行为通过过冷液相区和降低的玻璃化转变温度来表征，随着 B 摩尔分数的增加而得到改善。结果表明，随着 B 含量的增加，饱和磁化强度增加，矫顽力降低。
