Short range order of amorphous Mg60 Cu30 Y10 was investigated by x-ray and neutron diffraction, Cu and Y K -edge x-ray absorption fine structure measurements, and the reverse Monte Carlo simulation technique. We found that Mg-Mg and Mg-Cu nearest neighbor distances are very similar to values found in crystalline Mg2 Cu. The Cu-Y coordination number is 1.1±0.2, and the Cu-Y distance is ∼4% shorter than the sum of atomic radii, suggesting that attraction between Cu and Y plays an important role in stabilizing the glassy state. Thermal stability and structure evolution upon annealing were also studied by differential scanning calorimetry and in situ x-ray powder diffraction. The alloy shows a glass transition and three crystallization events, the first and dominant one at 456 K corresponding to eutectic crystallization of at least three phases: Mg2 Cu and most likely cubic MgY and CuMgY.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Aug 22 2007|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics