Abstract
Inhomogeneous deformation behavior in a magnesium alloy which is almost occupied by long-period stacking order (LPSO) phase has been investigated using high-precision markers drawn by electron beam lithography. Mg alloys containing Zn and rare earth elements such as Y or Gd have a characteristic microstructure including the LPSO phase and the usual hcp matrix phase. Mechanical properties of this alloy are remarkably improved by warm-extrusion, comparing to that in the as-cast alloy. The superior mechanical properties of this Mg alloy should be closely related not only to the microstructural inhomogeneity induced by the difference in the deformability of the dual phases but also to the characteristic deformation behavior of LPSO phase. The hard LPSO phase should contribute to the increase of yield and tensile strength. After the extrusion, a characteristic microstructure called "kink" was generated in the LPSO phase. In order to clarify the details of kinking behavior, high-precision marking method using electron beam lithography has been employed. After compression test, many wedge-shape microstructures accompanying large distortion of markers were observed on the specimen surface, which indicates that the kinking occurred by the compression test. The formation mechanism of such microstructural inhomogeneity in the LPSO phase is discussed.
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