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Characteristics of Amorphous Mn_3AlC Phases Formed by Mechanical Milling

Journal of Materials Science & technology 1997年第2期13卷 149-153页

作者： Fuxing YIN nanju gu (Hebei Institute of technology, tianin 300132, China)t.shigematsu N.Nakanishi(Faculty of Science, Konan University Kobe 658, Japan)Y.Osawa A.Sato(National Research Institute of Metals, tsukuba 305, Japan) Hebei Institute of technology Tianjin 300132 China Faculty of Science Konan University Kobe 658 Japan National Research Institute of Metals Tsukuba 305 Japan

Amorphization of Mn carbides by rapid quenching method has been proved to be *** mechanical milling in the present work, amorphous phases have been formed in the perovskitetype Mn3AlC compound. the transformation process from crystalline to amorphous phase was found to be milling time controlled, and 10 h is a critical period for the macroscopically single amorphous phase to form. It has been clarified that the redistribution of C atoms is an instinctive factor for amorphous phase to nucleate, and the atomic configuration in the amorphous phase is changed much in longer milling that different crystallizing behaviours have been caused. With X-ray diffraction and differential scanning calorimetry (DSC) results, an atomic configuration transition model is considered for the structures of the amorphous phases changed during milling.

关键词： Mn ta

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Structural Evolution of the Mn_(0.52)Sb_(0.48) Compound during High Energy Ball Milling

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Journal of Materials Science & technology 1996年第6期12卷 434-438页

作者： Fuxing YIn and nanju gu (Dept. of Materials Science and Engineering, Hebei Institute of technology, tianjin 300130, China)t.shigematsu and N.Naknishi (Dept. of Chemistry, Faculty of Science, Konan University, Kobe 658, Japan)(to whom correspondence should Dept. of Materials Science and Engineering Hebei Institute of Technology Tianjin 300130 China Dept. of Chemistry Faculty of Science Konan University Kobe 658 Japan

the structural transitions of the NiAs-type Mn0.52Sb0.48 magneto-ordered compound, ball milled to different periods, have been characterized by X-ray diffraction and DSC analysis. On the basis of lattice parameter results a structural evolution mode with three stages is proposed. In the first stage lattice parameters keep nearly unchanged with the refinement of grains and increase of lattice strain. In the second stage, microstrain shows a lowering tendency accompanying the successive decreases of grain size. the X-ray revealed internal strain is found to be strains inside the lattice, which can be relaxed with new grain formation. the change of tc is shown to be affected by the dimension of c axis, however the overall magnetization is continuously decreased with milling, due to the disordering process occurred in milling. Correspondent disordering mechanisms have been tentatively postulated and discussed according to the changes of lattice para meters.

关键词： Sb Ball Structural Evolution of the Mn Compound during High Energy Ball Milling

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Sintering Formation of Low temperature Phase MnBi and Its Disordering in Mechanical Milling

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Journal of Materials Science & technology 1996年第5期12卷 335-341页

作者： Yin, FX gu, NJ shigematsu, t Nakanishi, N KONAN UNIV FAC SCIDEPT CHEMKOBE 658JAPAN

With X-ray diffraction and DSC analysis, it is found that 4 cycles of sintering at 593 K are necessary for the complete production of the low-temperature phase (LtP) MnBi. the c/a of the fabricated LtP MnBi is 1.4286. Metastable phase MnBip formed in primary sintering stage of LtP MnBi has the similar crystal structure and lattice constant with the quenched high-temperature phase (HtP) Mn1.08Bi. the structural differences between MnBip phase and Mn1.08Bi phase are discussed. the LtP MnBi phase is unstable for strong mechanical milling as Bi appears after milling over 7200 s in the present milling condition. Strains caused by the mechanical attrition are difficult to accumulate in the MnBi crystals, and the crystal size of the milled MnBi is only 30 nm before the presence of grains coalescence. the whole milling process can be classified into 3 stages indicated by the structural changes. Based on the structural parameter calculation, the changes of atomic configurations in every stage have been discussed. the existence of Bi equivalent vacancy site is considered to play an important role in the disordering processes of Mn and Bi atoms.

关键词： Binary alloys

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