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• W1663709535 abstract "Abstract To interpret the notable strengthening of Ni3Al due to Hf additions in the strength anomaly domain, the dislocation features of a 3at.% Hf compound are characterized. Since the general microstructure does not exhibit obvious differences from that observed in similar compounds, the superdislocation core is investigated to find reasons for this effect. Various weak beam conditions are tested which never yield more than 3 peaks for the intensity profiles. The latter are interpreted for the chosen g, ng conditions (with 3 < n < 6) after extensive computer image simulations. The different fault energies related to the core are determined and found to be γ111 = 300mJm−2, γ010 = 250mJm−2 at 300K while γCSF exhibits very high values (larger than or equal to 460mJm−2). This explains the peculiar dislocation images. A comparison of the flow stress—temperature plots with those corresponding to a binary and a 1at.% Ta compounds confirms that the shifts observed for the flow stress in the anomaly domain and those for the peak temperature can be correlated well with the γCSF values, but not with the antiphase boundary anisotropy ratio. γCSF appears to be the key parameter for dislocation locking in the strength anomaly domain. Other solid solution strengthening effects operate in addition, without hindering the influence of γCSF. This interpretation of the differences in mechanical properties agrees with previous studies on similar compounds, but it is shown to hold even when these differences are large. In addition it is strongly supported by data about dislocation exhaustion rates which are measured in the Hf, the Ta and the binary compounds through repeated load relaxation experiments at 575K. The high ability of superpartials to cross-slip in this large γCSF Hf compound also explains the rather large minimum dislocation character observed for dislocations lying on the octahedral plane." @default.
• W1663709535 created "2016-06-24" @default.
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• W1663709535 date "2000-07-01" @default.
• W1663709535 modified "2023-10-17" @default.
• W1663709535 title "On the strengthening of Ni₃Al by hafnium additions" @default.
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• W1663709535 doi "https://doi.org/10.1080/01418610008212135" @default.
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