Abstract
The nickel aluminide with boron alloy is being considered for elevated-temperature structural application in particular for jet turbine engine components. The alloy is attractive due to its ease of production, the low cost of its components, and its property advantages relative to superalloys. Therefore, if alloys based on Ni3Al are successfully developed, substantial increases in engine performance and efficiency may be realized.
The creep characteristics of an intermetallic Ni3Al alloy containing boron produced by hot isostatic pressing were investigated in the temperature range 800 to 900°C. Various heat treatments were used to produce different initial grain sizes of this alloy.
Parameters studied were steady state strain rate, time to fracture, ductility and Larson-Miller parameter. The stress exponent, activation energy for creep and grain size exponent were calculated.
It was found that by increasing the temperature of the heat treatment, the grain size increased. The results showed that the creep behaviour for this alloy improved as grain size increased. Furthermore, a comparison of the resulting creep data with data obtained from references is discussed.
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Hashem, A., Stover, D., Buchkremer, HP. et al. Influence of the Heat Treatments on Creep Behaviour of Nickel Aluminide with Boron. Advanced Performance Materials 4, 9–23 (1997). https://doi.org/10.1023/A:1008672831156
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DOI: https://doi.org/10.1023/A:1008672831156