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    段玉平

    • 教授     博士生导师   硕士生导师
    • 主要任职:国际教育学院院长、直属党支部书记、留学生办公室主任
    • 其他任职:辽宁省凝固控制与数字化制备技术重点实验室副主任
    • 性别:男
    • 毕业院校:大连理工大学
    • 学位:博士
    • 所在单位:材料科学与工程学院
    • 学科:材料加工工程
    • 办公地点:铸造中心213
    • 联系方式:0411-84708446
    • 电子邮箱:duanyp@dlut.edu.cn

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    A new mechanism for improving electromagnetic properties based on tunable crystallographic structures of FeCoNiSixAl0.4 high entropy alloy powders

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    论文类型:期刊论文

    发表时间:2018-01-01

    发表刊物:RSC ADVANCES

    收录刊物:SCIE、EI

    卷号:8

    期号:27

    页面范围:14936-14946

    ISSN号:2046-2069

    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.