钴镍铁基金属玻璃结构弛豫的X射线研究

本工作在测定了Co_50.7Ni_19.5Fe_7.8Si₆B₁₆和Co_42.9Ni_27.3Fe_7.8Si₈B₁₄两种金属玻璃结构的基础上,进一步研究了不同保温时间的等温退火和不同温度下的等时退火对它们结构的影响,并测定了各退火态样品的小角度X射线散射强度,对其变化作了比较,分析了它们的结构弛豫现象。实验结果表明:结构弛豫可分为两种不同的类型,即拓扑短程序(TSRO)和化学短程序(CSRO)弛豫过程。本工作特别对后一种过程提供了直接的证据。最后还对这两种弛豫的原子过程作了初步的分析,强调了它们的并存和相关性。关键词：

INVESTIGATION OF STRUCTURE RELAXATION IN Co-Ni-Fe BASE METAL GLASSES BY X-RAY SCATTERING

The effecte of isothermal and isochronal annealing on the structures of the metal glasses Co_50.7Ni_19.5Fe_7.8Si₆B₁₆ and Co_42.9Ni_27.3Fe_7.8Si₈B₁₄ have been investigated by the wide angle and the small angle X-ray scattering methods. The experimental results obtained show two types of structure relaxation: The relaxation associated with topographical short range ordering (TSRO) and the relaxation associated with chemical short range ordering (CSRO), and give particularly the direct evidence of the CSRO relaxation process in the amorphous states. The atomic co-operative process of the two types of structure relaxation, and their coexistence and correlation are discussed preliminarily.