| 机械合金化制备的Fe1-xCx固溶体的结构和磁性研究 |
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| 引用本文： | 许士跃,张金仓,钟敏建,陈杭德,张正明,何正明.机械合金化制备的Fe1-xCx固溶体的结构和磁性研究[J].上海大学学报(英文版),2005,9(6). |
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| 作者姓名： | 许士跃 张金仓 钟敏建 陈杭德 张正明 何正明 |
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| 作者单位： | Department of Physics College of Sciences，Shanghai University Shanghai 200444 P.R.China，Department of Physics，College of Sciences，Shanghai University Shanghai 200444 P.R.China，Department of Physics，College of Sciences，Shanghai University Shanghai 200444 P.R.China，Department of Physics，College of Sciences，Shanghai University Shanghai 200444 P.R.China，Department of Physics，College of Sciences，Shanghai University Shanghai 200444 P.R.China，Department of Physics，College of Sciences，Shanghai University Shanghai 200444 P.R.China |
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| 摘 要： | 1IntroductionIt is well known that the solubility of carbon in Fefor both body-centered-cubic (bcc) and face-centered-cubic (fcc) structures is very low, even in a liquidstate. The maxi mum solubility of carbon in ferrite isonly about 0 .1 atompercent .The difference of atomicradius between Fe and C is so large that C is em-bedded at the interstitial site in the bcc or fcc Fe lat-tice . Hume-Rothery rules suggest that the atomic sizeof the solute and solvent should differ by less than15 %to…
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Structure and Magnetic Properties of Fe1- x Cx Solid Solution Prepared by Mechanical Alloying |
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| XU Shi-yue,ZHANG Jin-cang,ZHONG Min-jian,CHEN Hang-de,ZHANG Zheng-ming,HE Zheng-ming.Structure and Magnetic Properties of Fe1- x Cx Solid Solution Prepared by Mechanical Alloying[J].Journal of Shanghai University(English Edition),2005,9(6). |
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| Authors: | XU Shi-yue ZHANG Jin-cang ZHONG Min-jian CHEN Hang-de ZHANG Zheng-ming HE Zheng-ming |
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| Institution: | Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, P. R. China |
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| Abstract: | Supersaturated solid solutions Fe1-x Cx (0≤x≤0.9) of wide composition range have been prepared by mechanical alloying process. Nanocrystalline phase was formed for 0 ≤x≤0.67 and a large grain phase for 0.75 ≤ x ≤ 0.9. The large fraction of graphite volume puts off formation of nanocrystalline phase for high carbon content. In the large grain phase, magnetization follows simple magnetic dilution, and coercivity Hc is mainly due to dissolution of carbon at grain boundaries. In the nanocrystalline phase the alloying effect of carbon is revealed by a distinct reduction of average magnetic moment. The increasing lattice constant with increasing carbon content is observed for x ≤ 0.5, suggesting that the high carbon concentration may enhance diffusion of carbon into the Fe lattice. It shows a discontinuity in the Hc variation with a grain size D of nanocrystalline phase. For small grain D below the critical value, Hc increases with D. For a large grain D, Hc decreases with increasing D. The solubility limit of carbon in α-Fe extended by nanocrystalline phase formation is discussed. |
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| Keywords: | mechanical alloying transition metal alloys and compounds magnetization nanostructured materials |
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