液淬工艺和微量元素对非晶态Fe—B—Si合金热稳定性的影响

INFLUENCE OF QUENCHING CONDITIONS AND MICRO-ADDITION OF CERIUM ON THERMAL STABILITY OF AMORPHOUS Fe-B-Si ALLOYS

研究了液淬工艺参数和添加微量稀土元素Ce对非晶态Fe—B—Si合金热稳定性的影响.结果表明，制备非晶条带时的液淬速率愈高，在低温退火时合金的结构弛豫过程愈难进行；而非晶晶化与液淬条件之间不存在直接的联系.Ce的适量添加，在低温阶段延迟了结构弛豫过程中非晶条带延─脆转变的发生；在高温阶段使合金开始晶化的温度降低，且作用效果与条带中Ce的含量成正比．

The influences of melt spun parameters and dricro-addition of cerium on thermal stability of amorphous Fe-B-Si alloys have been studied. The higher cooling speed foras-quenched amorphous ribbon, the more difficult for structural relaxation in low-temperatureannealing process. Experimental results show no direct relationship between the quenching condition and crystallization for Fe80B11.5Si8.5 metallic glass. Optimal addition of cerium obviouslyretard the ductile-to-brittle transition process in structural relaxation stage, when annealingtemperature is low. At high temperature annealing stage, the addition of cerium lowers the onsettemperature of crystallization; and this effect is in direct proportion to the content of cerium inribbons.