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| 1 | ^(199)Sn AND ^(57)Fe MOSSBAUER SPECTROSCOPIC STUDY OF THE MECHANICALLY ALLOYED Fe-Sn ALLOYS显示文摘Nanocrystalline supersaturated solid solutions (Sa in Fe) with Sn content less than 50 at. %,and FeSn2 and Fe1.3Sn intermetallic compounds have been prepared by mechanical alloying of Fe and Sn mixture powders with composition of Fe1-xSnx (x≤0.5).The atomic alloying the formation and microstructure, especially the coordination environments, of the resultant alloys have been studied by X-ray diffraction, 57Fe and 119Sn Mossbauer Spectroscopy and diffrrential scanning calorimetry. The Fe and Sn coordination environments and the composition dependence of the hyperfine parameters on the Fe and Sn content have been fully discussed with respect to the solid dissolution alloying, grain refinement, and distortion caused or induced by mechanical alloying. | Y.Z.Yang Y.L.Zhu Q.S.Li X.M.Ma Y.D.Dong Y.Z.Chuang | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，5： | 0 |
| 2 | STRUCTURAL TRANSFORMATION INDUCED BY MECHANICALLY DRIVEN ALLOYING AND SUBSEQUENT MAGNETIC PROPERLIESOF THE Fe-Cu SYSTEM显示文摘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. | Y.Z.Yang Y.HLuo Q.S.Li Y.L.Zhu X.M.Ma Y.D.Dong Y.Z.Chuang | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，2： | 0 |
| 3 | THE RESEARCH OF THE HIGHER TOUGHNESS HIGH CHROMIUM WHITE CAST IRONAS CAST显示文摘Inthispaper the effectof alloying on thestructure and properties of high chromium whilecastiron hasbeen research. Theresultsobtained show thatthealloyingcan changethe matrix structure,buttheeffecton thecarbidesislittle when thereisless Ccontent and less Cr con tent,and the alloyingcan changethe morphology and distribution ofthecarbides,which pro duce granular and bar likecarbides.Theimpacttoughness of the high chromium whitecast ironascast may definitely amount to above 12 1J/cm2 ~14 5J/cm2 ,higher by 35 % ~ 143 % than com mon high chromium whitecastiron . | Q.S.Li,Z.J.Yan , Y.S. Chai and J.W.Zhang Departmentof Mechanical Engineering ,Taiyuan Heavy Machinery Institute,Taiyuan 030024 ,China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，4： | 0 |
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