STRUCTURAL TRANSFORMATION INDUCED BY MECHANICALLY DRIVEN ALLOYING AND SUBSEQUENT MAGNETIC PROPERLIES OF THE Fe-Cu SYSTEM |
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Authors: | YZ Yang YH Luo QS Li YL Zhu XM Ma YD Dong and YZ Chuang |
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Affiliation: | Y.Z. Yang,Y.H Luo,Q.S. Li,Y.L. Zhu,X.M. Ma,Y.D. Dong and Y.Z. Chuang(Department of Materials Science and Engineering,Guangdong University of Technology,Guangzhou,China)(Guangdong Educational College,Guangzhou,China)(Department of Materials Science and Engineering,Shanghai University,Shanghai,China)(Institute of Metal Research,The Chinese Academy of Sciences,Shenyang,China) |
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Abstract: | The structural transformation in Fe-Cu powder induced by mechanically driven alloying has been monitored by the lattice constant measurements and Mossbauer spectroscopy. For the samples with Cu higher than 75at.% Mossbauer the spectra show a broad paramagnetic doublet; for samples with 50 and 60at.%Cu a new broad ferromagnetic sextet; for those with less than 30at.%Cu similar to those of α-Fe. The main peaks of the hyperfine field distribution significantly broaden and shift to a lower position with increasing Cu content due to the complex environments of iron atoms in the solid solutions and the reduction in the nearest neighbor Fe of a cental Fe atom, respectively. The saturation magnetization of Fe-Cu alloys monotonously decreases with Cu content. The complex composition dependence of coercive field for the milled samples is discussed with respect to the solid dissolution, grain size, interfacial state etc.. The increase of lattice constants with the solute content in the two terminal solid solutions has been explained by the volume-size factor theory or magnetovolume effect. |
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Keywords: | mechanical alloying Mossbauer effect Fe-Cu alloy magnetic measurement |
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