The effect of holmium addition to the Al-Si system has been experimentally\nstudied, as the isothermal section at 500 DegreeC. The constitution of the alloys has\nbeen determined by means of scanning electron microscopy (SEM), electron\nmicroprobe analysis (EDXS) and X-ray powder diffraction. The knowledge of\nthe phase relationships in the R-Al-Si ternary systems (R: rare earths element)\nis essential to deeply understand the technological properties of the Al-Si\nbased alloys, that are useful in different industrial fields. In the system investigated\nhave been identify nineteen ternary fields and twelve two phase fields.\nThree ternary compounds have been found in this ternary section:..........................
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