SummaryThe structure of Al 3 Zr precipitates in Al-1.0Mg-0.6Si-0.5Zr (in wt.%) alloy was investigated using conventional transmission electron microscopy (TEM) and high-resolution TEM (HREM). After annealing of the alloy in the temperature range 450-540 °C, spherical precipitates of metastable L1 2 -Al 3 Zr phase appeared nearly homogeneously within the matrix, and elongated particles were found at grain boundaries. L1 2 -structured Al 3 Zr were about 20-30 nm in diameter and coherent with the matrix. Inside some of them, planar faults parallel to {100} planes were revealed by use of HREM. Most probably, these faults are an indication of the transition stage of transformation to the stable D0 23 -type Al 3 Zr phase. The elongated precipitates (about 100 nm) were identified as D0 22 -type Al 3 Zr. Energy-dispersive X-ray analysis showed that they contain, apart from Al, mainly Zr with small amounts of Si. The substitution of Al by Si increased the stability of the D0 22 -Al 3 Zr as compared with D0 23 -Al 3 Zr.
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