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Effect of combined metal-carbon additions on the microstructure and structure of Sm_2Fe_(17)

机译：金属-碳混合添加对Sm_2Fe_（17）的组织的影响

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摘要

The effect of combined alloying additions on the structure and scale of rapidly solidified Sm―Fe alloys was investigated. Transition metal additions tend to promote the formation of the disordered TbCu_7-type structure in Sm_2Fe_(17) alloys, as determined by monitoring the long-range order parameter. Essentially no order was observed for M = Ti, Zr, V, or Nb. Thus, the structure was close to the prototypical TbCu_7-type structure. With M = Si, a large amount of order was observed (S = 0.62), resulting in a structure closer to the well-ordered Th_2Zn_(17)-type. The microstructural scale was also affected by alloying. In this case, refinement depended on the substituent and also on carbon for microstructural refinement. The scale of the as-solidified grain structures ranged from 100 nm for SiC-modified alloys to 13 nm for NbC-modified alloys. The degree of refinement was directly related to the atomic size of the M addition. The refinement was the result of solute partitioning to grain boundaries, resulting in a solute drag effect that lowered the growth rates.
机译：研究了合金添加量对快速凝固Sm-Fe合金组织和尺寸的影响。过渡金属的添加趋向于促进Sm_2Fe_（17）合金中无序TbCu_7型结构的形成，这是通过监测远程有序参数确定的。基本上没有观察到M = Ti，Zr，V或Nb的顺序。因此，该结构接近于典型的TbCu_7型结构。在M ＝ Si的情况下，观察到大量有序（S ＝ 0.62），导致结构更接近有序的Th_2Zn_（17）型。微观结构的规模也受到合金化的影响。在这种情况下，细化取决于取代基，并且还取决于碳以进行微结构细化。凝固后的晶粒结构的尺寸范围从SiC改性合金的100 nm到NbC改性合金的13 nm。精制程度与M加成物的原子大小直接相关。细化是溶质分配到晶界的结果，导致溶质拖曳效应降低了生长速率。

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  • 来源
    《Journal of Materials Research》 |2003年第2期|p.279-283|共5页
  • 作者

    B.E. Meacham; J.E. Shield;

  • 作者单位

    Metals and Ceramics Division, Idaho National Engineering Laboratory, Idaho Falls, Idaho 83415;

  • 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;
  • 关键词

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