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Many compressive and tensile tests showed that the room temperature ductility of boron-freeNi_3Al alloy may be markedly improved by a moderate addition of Zr.The ductility of thestoichiometric Ni_3Al and even slightly enriched with Al,may be improved fairly between 400—600℃,which behaves much better if Zr is added together with B.However,the high tem-perature ductility of Ni_3Al alloys containing Cr may be significantly increased by Zr whichsegregates slightly along grain boundaries.Thus,the toughening mechanism of Zr alloyingseems to be different from that of B addition.
Many compressive and tensile tests showed that the room temperature ductility of boron-freeNi_3Al alloys may be markedly improved by a moderate addition of Zr.The ductility of the stoichiometric Ni_3Al and even slightly enriched with Al, may be improved substantially between 400-600 ° C, which behaves much better if Zr is added together with B. However, the high tem-perature ductility of Ni_3Al alloys containing Cr which may significantly increased by Zr which are not grain along along the grain boundaries. Thus, the toughening mechanism of Zr alloyingseems to be different from that of B addition.