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- W2076670503 abstract "The Ni[sub 3]Al intermetallic compound possesses the L1[sub 2]-type ordered structure below the melting temperature. Its yield strength has been shown to increase with increasing temperature. Also, it is the principal strengthening phase ([gamma][prime]) of the commercial nickelbase superalloys. However, there exists a serious problem of brittle intergranular fracture in polycrystalline Ni[sub 3]Al. By macroalloying with hafnium, Liu and White showed that the yield stress of Ni[sub 3]Al increases and raises the peak-strength temperature with hafnium additions. Taniguchi et al. found that hafnium alloying effectively decreases the oxidation rate and improves oxide scale adherence. In addition, hafnium additions improved other properties of Ni[sub 3]Al, such as creep resistance and high-cycle fatigue life. Although ternary or quaternary alloying additions have been shown to improve the thermomechanical properties of Ni[sub 3]Al, some alloying elements might segregate to the grain boundary to cause grain boundary melting at elevated temperatures below 1,395 C. The present study shows that the increase of hafnium content decreases the melting temperature of this alloy and, thus, increases the tendency for grain boundaries to melt." @default.
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- W2076670503 date "1994-09-01" @default.
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- W2076670503 title "Grain boundary melting of hafnium containing Ni3Al intermetallic compounds" @default.
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- W2076670503 doi "https://doi.org/10.1016/0956-716x(94)90224-0" @default.
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