非晶态合金淬态脆性的研究进展

Progress on Research of Brittleness of As-cast Amorphous Ribbons

利用快速凝固技术制备的非晶态合金在某些情况下可表现出淬态脆性，给带村的进一步加工造成困难。本文介绍了国内外有关这一问题的研究进展，尤其是从工艺上改善非晶带材韧性的成果。非晶态合金的淬态脆性有多方面原因：一方面，合金元素、玻璃化元素以及杂质的种类、含量和存在形式等均影响带材的玻璃形成能力和微观结构（短程序），从而影响脆性。另一方面，冷却速率不足会使得合金在制备过程中即发生结构弛豫，是导致淬态脆性的最主要工艺因素，因此工艺参数如冷却辊的冷却能力、带材剥离温度、带材尺寸和表面质量等对淬态脆性有显著影响，此外母合金熔液的处理方式也在一定程度上影响淬态脆性。

Rapidly quenched amorphous alloys can be brittle at as-cast state, resultingin difficulties for further processing. some research results on this theme are reviewed.There are many factors that affect quenched-in brittleness of amorphous ribbons. On onehand, elemental composition and impurities in the alloys have remarkable influences ontheir brittleness. On the other hand, insufficient cooling rate during preparation is one ofthe most important reasons for the brittleness. Therefore, Processing parameters, such ascooling ability of substrate, lift--off temperature of the ribbons, dimension and surfaceroughness of the ribbons, prominently effect on the brittleness. Weanwhile heat treatmentof the melt before quenching has influence on the brittleness to some extent.