Formation, structure and properties of magnetic bulk metallic glasses

多元（Fe，Co）基大块非晶合金（BMG）的软磁性能是其合成和物理性质研究的热点。该项目的目的是开发具有改进的玻璃形成能力和良好软磁性能的新型（Fe，Co）基BMG，并了解制备和加工条件的影响，例如淬火速率、铸造前熔体过热程度、通过助熔处理的熔体净化、弛豫、纳米晶化和化学计量变化/添加（例如P）对相形成和包括畴结构的所得磁性的影响。此外，它是感兴趣的研究外部条件，如高压，低温，和外部磁场的结构形成和材料的磁性的影响。这项研究的另一个动机是确定多组分BMG的软磁性能与其他传统金属玻璃相比如何，这些传统金属玻璃需要更高的临界冷却速率来形成玻璃。因此，将在不同的淬火速率下制备具有不同尺寸和几何形状的样品，以确定相形成、显微结构和软磁性能之间的相关性。

The interesting soft magnetic properties of multicomponent (Fe, Co) based bulk metallic glasses (BMGs) have been a great stimulus for research regarding their synthesis and physical properties. The purpose of the project is to develop new (Fe, Co)-based BMGs with improved glass-forming ability and good soft magnetic properties, and to understand the effect of preparation and processing conditions such as quenching rate, degree of overheating the melt prior to casting, melt purification by fluxing treatment, relaxation, nanocrystallization and stoichiometry variations/additions (e.g. P) on the phase formation and the resulting magnetic properties including domain structures. In addition, it is of interest to study the influence of external conditions like high pressure, low temperature, and external magnetic field on structure formation and the magnetic properties of the material. An additional motivation for the study is to determine how the soft magnetic properties of multicomponent BMGs compare to other conventional metallic glasses which require higher critical cooling rate for glass formation. Therefore, samples with different size and geometry will be prepared at different quenching rates in order to determine the correlation between phase formation, microstructure and soft magnetic properties.