Abstract
An experimental study was carried out to compare the creep properties of hot isostatically pressed (HIP) Ni 3 Al intermetallic compound with those of Ni 3 Al+B at temperatures ranging from 800 to 900 °C and at engineering stress levels ranging from 20 to 90 MPa. The present investigation indicates that for P/M nickel aluminide, the creep characteristics denoted by the transient, steady state creep rate parameters, and the time to rupture are considerably affected by a minor boron addition (0.5 at. %). The transient creep was studied using both time and strain hardening theories. The results obtained showed that both time and strain hardening exponents significantly increased with boron addition, which led to a considerable reduction of the transient creep rates and of the steady state creep rate. Consequently, rupture time is increased by boron addition. The minor boron addition decreased the rupture creep strain for nickel aluminide markedly.
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