Formation of Quasicrystalline Alloy Powders by Mechanical Alloying (アモルファス粉末・成形材料)

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概要

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• Mechanical alloying (MA) was used to obtain quasicrystalline; phases Mg<SUB>3</SUB>Zn<SUB>5-x</SUB>Alx (x=2-4) and i-Mg<SUB>32</SUB>Cu<SUB>8</SUB>Al<SUB>4</SUB> starting from the elementary metal powders.Mechanical disordering(MD) of cubic Frank-Kasper (F-K) phases such as Mg<SUB>32</SUB>(Zn, A1)<SUB>49</SUB> lead to formation of relative quasicrystalline structures as well.The X-ray diffraction patterns of i-phases are identical to those obtained by rapid quenching. SAD patterns of both MA and MD samples demonstrated 2, 3, 6, and 5-fold symmetry pictures.There are ten sets of Bragg spots with angles between them 36°. The values of the interplanar distances in i-Mg<SUB>32</SUB>(Zn, Al)49 are d<SUB>1</SUB>=0.141nm, d<SUB>2</SUB>=0.228nm, d<SUB>3</SUB>=0.369nm, d<SUB>4</SUB>=0.597nm, d<SUB>n</SUB>=d<SUB>n-1</SUB>t, where t=(1+5<SUP>1/2</SUP>)/2.The cubic phases Mg<SUB>32</SUB>(Zn, Al)<SUB>49</SUB> and Mg32(Cu, Al)49 are F-K structures with local 5-fold symmetry units.The icosa-hedral structure can be described in terms of cubic F-K phase containing discli-nations.The MD of F-K phases lead to progressive broadering of X-ray peaks due to the structural, defects arising in cubic lattice and the icosahedral phases were formed apparently due to the formation of disclination network during MD.

著者

• Bokhonov Boris

  Institute Of Solid State Chemistry Siberian Branch Russian Academy Of Sciences

• Ivanov Eugene

  Institute for Materials Research, Tohoku University

• Konstanchuk Irina

  Institute of Solid State Chemistry, Novosibirsk Russia

関連論文

• Preparation of BN-doped carbon blacks by mechanochemical alloying of carbon and h-BN and its use as a catalyst for the oxygen reduction (小特集 炭素材料科学の進展と物性・機能評価)
• Formation of Quasicrystalline Alloy Powders by Mechanical Alloying (アモルファス粉末・成形材料)

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