An X-Ray Study on the Structure of Ordered Guinier-Preston Zone Formed in Aged Magnesium-Rich Magnesium-Silver Alloys

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  • Mg基Mg-Ag合金に現われる規則Guinier-Preston Zoneの構造に関するX線的研究
  • Mgキ Mg-Ag ゴウキン ニ アラワレル キソク Guinier-Preston Zone ノ コウゾウ ニ カンスル Xセンテキ ケンキュウ

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Abstract

In the previous paper it was shown that two kinds of G.P. zones were formed in the aged Mg-Ag alloys containing 12.6 wt%Ag; one was an ordinary zone having a platelike form and the other was a new one of an oblate ellipsoid. In the present experiment the structure of the latter G.P. zone has been studied by X-ray diffraction using monochromatic radiation, with the result that this zone has an ordered arrangement of silver atoms in it. This type of G.P. zone can be called G.P.[2] after the denomination of the ordered G.P. zone in Al-Cu alloys. In the oscillation photographs about the [0001] axis of the matrix, the diffuse diffraction spots from the G.P.[2] are seen forming a set of layer lines superposing those of the matrix. The distribution of diffraction spots on the (000l) layer lines can be satisfactorily interpreted as due to the stacking of the two-dimensional superlattice which has the value of lattice parameter a\sqrt7 times as large as that of the matrix, and the angle between the a axis of the superlattice and that of the matrix is tan−1(\sqrt3⁄5)=19°6.4′. The lattice parameters of the G.P.[2] obtained from this model of superstructure are a=3.14×\sqrt7=8.31 kX and c=5.36 kX.

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