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Sintering mechanisms of mechanically alloyed CoCrFeNi high-entropy alloy powders

机译：机械合金化CoCrFeNi高熵合金粉末的烧结机理

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摘要

High-entropy alloys (HEAs) are receiving considerable attention since last decade because of their ability to give excellent strength with reasonably good elongation during fracture. The mechanical alloying followed by sintering is one of the routes for fabrication; however, there are limited reports on sintering mechanisms of HEA powders. The present investigation studies sintering mechanisms of CoCrFeNi alloy powders in as-milled and annealed conditions using dilatometer experiments. The annealed powder shows slower densification behavior and higher activation energy of sintering, compared to the as-milled powder. Diffusion coefficients were analyzed through sintering models and compared with literature data. The as-milled powder was found to exhibit mixed response, i.e., the grain boundary diffusion seems to be dominating initially due to a large grain boundary fraction but volume diffusion (VD) also contributes significantly, due to high defect concentration and metastable phases. VD was found to be the dominating mechanism during sintering of single phase, stable annealed powder.
机译：自上个十年以来，高熵合金（HEA）由于在断裂过程中具有出色的强度和相当好的伸长率而备受关注。机械合金化然后烧结是制造的途径之一。然而，关于HEA粉末烧结机理的报道很少。本研究使用膨胀计实验研究了在研磨和退火条件下CoCrFeNi合金粉末的烧结机理。与研磨后的粉末相比，退火后的粉末显示出较慢的致密化行为和较高的烧结活化能。通过烧结模型分析扩散系数，并与文献数据进行比较。发现研磨后的粉末表现出混合响应，即，由于较大的晶界分数，晶界扩散最初似乎占主导，但是由于高的缺陷浓度和亚稳相，体积扩散（VD）也起重要作用。发现VD是烧结单相，稳定退火粉末的主要机理。

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  • 来源
    《Journal of Materials Research》 |2018年第19期|3321-3329|共9页
  • 作者

    Mane Rahul B.; Panigrahi Bharat B.;

  • 作者单位

    Indian Inst Technol Hyderabad, Dept Mat Sci & Met Engn, Sangareddy 502285, Telangana, India;

    Indian Inst Technol Hyderabad, Dept Mat Sci & Met Engn, Sangareddy 502285, Telangana, India;

  • 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);
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