Mechanical alloying effect and structural observation of (V, Fe)-N amorphous alloy powders (기계적 합금화에 의한 (V, Fe)-N계 비정질 합금의 제조 및 구조변화)

Lee Chung-Hyo (이충효); Ji Soon Kim (김지순); Sung Yeong Chun (전성용)

Mechanical alloying effect and structural observation of (V, Fe)-N amorphous alloy powders

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2004, 14(4), pp.129-134
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering

Lee Chung-Hyo ¹, Ji Soon Kim ², Sung Yeong Chun ¹

¹목포대학교
²울산대학교

Accredited

ABSTRACT

In this study, we investigated the effect of a nitrogen atom on the amorphization of V-Fe alloy through solid-gas reaction during mechanical alloying (MA). MA by planetary ball mill of V70Fe30 elemental powders was carried out under the nitrogen gas atmosphere. Amorphization has been observed after 160 hours of ball milling in this case. The DSC spectrum for the mechanically alloyed (V70Fe30)0.89N0.11 powders exhibits a sharp exothermic peak due to crystallization at about 600oC. Structural transformation from the bcc crystalline to amorphous states was also observed through X-ray and neutron diffractions. We take a full advantage of a negligibly small scattering length of the V atom in the neutron diffraction measurement. During amorphization process the octahedral unit, which is typical of a polyhedron formed in any crystal structures, was preferentially destroyed and transformed into the tetrahedral unit. Futhermore, neutron diffraction measurements revealed that a nitrogen atom is selectively situated at a center of the polyhedron formed by V atoms.

KEYWORDS

Mechanical alloying, Amorphization, Structural factor S(Q), V-Fe-N system, Radial distribution function RDF(r)

Citation status

* References for papers published after 2023 are currently being built.

[journal] [ 1 ]H.J. Fecht / 1990 / ？Nanocrystalline metals prepared by high-energy ball milling : 21 2333~

[journal] [ 2 ]C.C. Koch / 1983 / ？Preparation of amorphous Ni60Nb40 by mech- anical alloying : 1017~

[journal] [ 3 ]H. Sun / 1990 / ？Magnetic properties of a new series of rare-earth iron nitride : 64~

[journal] [ 4 ]J. Eckert / 1990 / ？Glass formation and extended solubilities in mechanically alloyed cobalt-transition metal alloys : 293~

[journal] K. Fujimoto / 1994 / ？Thermoelectric properties of b-FeSi2 prepared by mechanical alloying J. Jpn. Soc. of Powder and Powder Metallurgy 41 : 5 1308~

[journal] [ 6 ]K. Aoki / 1992 / ？Nitrogen-induced amorphization of Ti-Zr powders during mech- anical alloying : 1037~

[journal] [ 7 ]P. Millet / 1994 / ？Amorphization of silicon and germanium by mechanical grinding : 1222~

[journal] [ 8 ]K. Sakurai / 1994 / ？Nitrogen effect in mechanical alloying of immiscible Cu-V : 7752~

[journal] [ 9 ]Y. Ogino / 1991 / ？Influence of milling atmosphere on amorphization of chromium and Cr-Cu powders by ball milling : 221~

[journal] C.H. Lee / 1992 / ？Structural evidence for the amorphization of mechanically alloyed Cu-Ta powders studied by neutron diffraction and EXAFS : 399~

[journal] T. Fukunaga / 1994 / ？Nitrogen induced amorphization observed by X-ray and neutron diffractions in the immiscible V-Cu system : 98~

[journal] T. Fukunaga / 1995 / Structural change during the amorphization process by mechanical alloying : 518~

[journal] K. Suzuki / 1991 / ？Structural characterization of Ni-V amorphous alloys prepared by mechanical alloying : 987~

[journal] U. Mizutani / 1995 / Mechanical alloying in Cu-V and Cu-Ta systems characterized by a positive heat of mixing 36 : 210~

KJCKorea
Journal Central

Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19