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首页> 外文期刊>RSC Advances >A new mechanism for improving electromagnetic properties based on tunable crystallographic structures of FeCoNiSixAl0.4 high entropy alloy powders
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A new mechanism for improving electromagnetic properties based on tunable crystallographic structures of FeCoNiSixAl0.4 high entropy alloy powders

机译：一种基于FeconisixAl0.4高熵合金粉末可调晶体结构改善电磁特性的新机制

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摘要

Mechanical grinding method was employed to prepare FeCoNiSixAl0.4 high entropy alloy powders, which present a simple solid solution structure (FCC and BCC). After annealing at 673 K, a large amount of BCC phase precipitate and a small amount of CoFe2O4 phase generate. The change of crystal structure may lead to an increase in M-s (from 100.3 emu g(-1) to 124.2 emu g(-1)) and a decrease in H-c (from 107 Oe to 59.5 Oe for FeCoNiSi0.3Al0.4). The silica content has a significant effect on the electromagnetic parameters of the as-milled and as-annealed alloy powders, presenting the trend of first increase and then decrease. And the dielectric constant is obviously improved after annealing (e.g. from 8.48 to 11.21 and from 0.15 to 2.84 for the epsilon and epsilon of FeCoNiSi0.3Al0.4 at 18 GHz, respectively), while the permeability is reduced. Compared with those of the as-milled samples, the of as-annealed FeCoNiSixAl0.4 (x = 0.1, 0.3, 0.4) remain unchanged or even increase due to the formation of CoFe2O4. Meanwhile, the relative content of the precipitated BCC to FCC for FeCoNiSi0.3Al0.4 enhance with the annealing temperature increase from 573 K to 773 K, and then reduce. And the epsilon and at 2 GHz present the same trend as the content ratio (A(BCC)/A(FCC)), while the epsilon improve obviously after annealing, corresponding to the elevation of conductivity.
机译：采用机械研磨方法制备FeconisixAl0.4高熵合金粉末，其具有简单的固溶性溶液结构（FCC和BCC）。在673 k下退火后，大量的BCC相沉淀物和少量COFE2O4相产生。晶体结构的变化可能导致M-S的增加（从100.3 emu g（-1）至124.2 emu g（-1））和H-C（从107 OE至59.5 oe的eConisi0.3Al0.4的降低）。二氧化硅含量对AS-MICHED和退火合金粉末的电磁参数具有显着影响，提出了首次增加的趋势，然后降低。在退火后显然改善了介电常数（例如，从8.48至11.21和0.15至2.84分别为0.15至2.84，分别为18GHz，渗透率为18GHz），而渗透性降低。与AS-MICHED样品的样品相比，由于COFE2O4的形成，以磨削的FECONISXAL0.4（x = 0.1,0.3,0.4）保持不变或甚至增加。同时，沉淀的BCC至FCC的相对含量为Feconisi0.3A10.4增强了从573k至773k增加的退火温度，然后减少。并且epsilon和2GHz呈现与含量比相同的趋势（A（BCC）/ A（FCC）），而退火后epsilon显而易见，对应于电导率的升高。

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  • 来源
    《RSC Advances》 |2018年第27期|共11页
  • 作者

    Zhang Bin; Duan Yuping; Cui Yulong; Ma Guojia; Wang Tongmin; Dong Xinglong;

  • 作者单位

    Dalian Univ Technol Sch Mat Sci &

    Engn Key Lab Solidificat Control &

    Digital Preparat Te Dalian 116085 Peoples R China;

    Dalian Univ Technol Sch Mat Sci &

    Engn Key Lab Solidificat Control &

    Digital Preparat Te Dalian 116085 Peoples R China;

    Dalian Univ Technol Sch Mat Sci &

    Engn Key Lab Solidificat Control &

    Digital Preparat Te Dalian 116085 Peoples R China;

    Beijing Aeronaut Mfg Technol Res Inst Beijing 100024 Peoples R China;

    Dalian Univ Technol Sch Mat Sci &

    Engn Key Lab Solidificat Control &

    Digital Preparat Te Dalian 116085 Peoples R China;

    Dalian Univ Technol Sch Mat Sci &

    Engn Key Lab Solidificat Control &

    Digital Preparat Te Dalian 116085 Peoples R China;

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