Abstract
The phase relationship of the Mg-Ni-Y system along the Mg-NiY line has been investigated using electron probe micro analysis (EPMA) at 673 K. Three two phase regions (Mg2Y+τ6, Mg2Y+ MgNiY(τ3), MgY+Mg3Ni2Y4(τ1)) and two three phase regions (Mg2Y+Mg3Ni2Y4(τ1)+ MgNi2Y2(τ2) and NiY+Mg3Ni2Y4(τ1)+MgNi2Y2(τ2)) have been identified. One new ternary compound Mg5NiY(τ5) was found and reported for the first time. Ternary solubility of the Mg8-13NiY(τ6) compound has been established which extends from 77.10 at.% Mg until 86.77 at.% Mg along the Mg-NiY section. Solubility of the third element in the binary compounds, NiY, Mg2Y and MgY has also been determined. Keywords: Mg alloy, phase identification, phase equilibrium, isothermal section.
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