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The phase analysis of Ni20Cr13Al showed the presence of the (hypostoichiometric) γ (Ni 3 Al) phase in chill-cast alloy. The spheroid particles of γ change their shape to cuboidal at the very beginning of the annealing at 800°C. This change is accompanied by a decrease of volume fraction of γ , and at the same time by an increase of hardness. The annealing also leads to the precipitation...
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