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首页> 外文期刊>Journal of Materials Research >Deformation-induced microstructural changes in Fe_4ONi_40p_14B_6 metallic glass
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Deformation-induced microstructural changes in Fe_4ONi_40p_14B_6 metallic glass

机译：Fe_4ONi_40p_14B_6金属玻璃中形变引起的微观结构变化

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摘要

The effect of mechanical deformation via high-energy ball milling on the structure of the Fe_4ONi_40p_14B_6 metallic glass was studied by means of x-ray diffactometry, transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). After 5 h of milling, TEM observations indicated that some nanocrystallites with a diameter of about 6 nm precipitated from surface layers of the amorphous ribbons, whereas the bulk remained amorphous. When milling time was increased to l1 h, bulk crystallization occurred. The amorphous Fe_4ONi_40p_14B_6 alloy crystallized into a mixture of gamma-(Fe,Ni) and (Fe,Ni)_3(P,B). To understand the microstructural changes occurring in the amorphous ribbons before the onset of bulk crystallization, the isothermal crystallization behavior of as-deformed amorphous ribbons was studied. Compared with as-quenched amorphous ribbons, the local value of the Avrami exponent, derived from isothermal DSC data, increased from 3.5 to 4.l for bulk crystallization. The thermal crystallization mechanism of defOrmed amorphous Fe_4ONi_40p_14B_6 ribbons changed from an eutectic-type reaction with simultaneous precipitation of gamma-(Fe,Ni) and (Fe,Ni)_3(P,B) from the amorphous matrix to a primary-type reaction with precipitation of -Fe(P,B) preceding the formation of gamma-(Fe,Ni) and (Fe,Ni)_3(P,B). Our results suggest that several hours of mechanical milling cause surface crystallization and some atomic rearrangements in the amorphous alloy. The latter effect may be responsible for the observed primary-type reaction for crystallization of the deforme
机译：通过X射线衍射法，透射电子显微镜（TEM）和差示扫描量热法（DSC）研究了高能球磨机械变形对Fe_4ONi_40p_14B_6金属玻璃结构的影响。研磨5小时后，TEM观察表明，一些直径约6 nm的纳米微晶从无定形带的表面层中析出，而大部分仍保持无定形。当研磨时间增加到11小时时，发生块状结晶。非晶态的Fe_4ONi_40p_14B_6合金结晶为γ-（Fe，Ni）和（Fe，Ni）_3（P，B）的混合物。为了了解在开始大量结晶之前非晶带中发生的微观结构变化，研究了变形非晶带的等温结晶行为。与淬火非晶带相比，根据等温DSC数据得出的Avrami指数的局部值从3.5升至4.1升。 defOrmed非晶态Fe_4ONi_40p_14B_6薄带的热结晶机理从共晶型反应和同时从非晶态基质中析出的γ-（Fe，Ni）和（Fe，Ni）_3（P，B）转变为初生型反应。在形成γ-（Fe，Ni）和（Fe，Ni）_3（P，B）之前先析出-Fe（P，B）。我们的结果表明，数小时的机械研磨会导致非晶态合金中的表面结晶和某些原子重排。后一种效应可能是所观察到的变形晶体初级反应的原因

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  • 来源
    《Journal of Materials Research》 |1999年第9期|3765-3776|共12页
  • 作者

    G.J. Fan;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
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