Sc提高锆基块体非晶合金玻璃形成能力的机理

The Mechanism of Sc Increaseing the Glass Forming Ability of a Zirconium Based Bulk Amorphous Alloy

摘要:

以Zr52.5Cu17.9Ni14.6Al10Ti5五元锆基非晶合金为研究对象，在以工业级海绵锆为原料制备的合金中加入元素Sc，制备出楔形试样，从微观角度分析了元素Sc提高非晶合金玻璃形成能力的机理。结果表明，元素Sc的加入可显著改变Zr52.5Cu17.9Ni14.6Al10Ti5五元锆基块体非晶态合金在非晶态-晶态过渡区中先析相的相结构及组织形态。元素Sc强烈的脱氧作用可减少合金中锆氧化物／锆氧团簇，从而消除了过冷液体中异质形核的核心，提高了Zr52.5Cu17.9Ni14.6Al10Ti5五元锆基块体非晶态合金的玻璃形成能力。

Abstract:

Quintary Zr52.5Cu17.9Ni14.6Al10Ti5 bulk amorphous alloys were synthesized with industrial sponge zirconium. The wedge-shaped samples added with Sc were prepared. The mechanism of Sc increaseing the GFA of the ahoy was analyzed by means of X-ray diffraction. SEM and Energy Spectrum Analysis. The results showed that adding Sc to the alloy could cause the transformation of phase structure and the composition of the pre-separation phase in the transitional region of the quintary alloy. Sc with great capacity of deoxidization could decrease the existence of Zirconium oxide or Zirconium/oxygen clusters in the alloy, and eliminate heterogeneous nucleants in the melt. Consequently. adding Sc to the alloy could increase the GFA of the quintary alloy.