脉冲电流加热与等温晶化制备纳米晶FeCuNbMoSiB的组织与性能

Microstructures and Properties of FeCuNbMoSiB Nanocrystallized by Shortly Pulsed High Current Heating and Conventional Annealing

采用大电流短脉冲快速加热纳米晶合金Ｆｅ７３．５Ｃｕ１Ｎｂ１Ｍｏ２Ｓｉ１３．５Ｂ９。通过ＸＲＤ、ＴＥＭ组织与相分析，磁性能及相对断裂应变的测定，研究了脉冲电流加热对合金纳米晶化后的组织、磁性与脆性的影响，并与常规等温晶化法进行了对比。结果表明，适当工艺参数的脉冲电流加热可以制备出晶粒尺寸为８～１５ｎｍ的纳米晶，其软磁性能略优于常规法而且韧性得到明显改善。

The microstructure, magnetic properties and brittleness of nanocrystalline alloy with nominal composition Fe_73.5Cu_1Nb_1Mo_2Si_13.5B_9, obtained by shortly pulsed high current heating and conventional annealing, have been investigated by means of magnetic measurement, XRD,TEM,as well as the measurement of relative fracture strain εf. The experimental results have shown that the samples with the mean grain size ranged from 8 to 15nm can be obtained by properly pulsed current heating,which possess better soft magnetic properties and less brittleness than those of conventionally annealed samples.