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- W2040961750 abstract "Abstract The superplastic properties of alumina can be changed in interesting ways by small additions of transition metals zirconium, hafnium, or titanium. All three introduce a “leaky” threshold stress of 5–20 MPa. Above the threshold the flow rate is linearly related to the applied stress. A similar threshold is observed in sinterforging experiments. The additions also have the effect of enhancing the superplastic ductility and the fracture strength, presumably by increasing interfacial cohesion. This higher interfacial cohesion appears to correlate to the higher activation energy for boundary diffusion and to a lower interfacial energy. The threshold is explained in terms of a roughening transition of interfaces that are faceted. Below the transition the flow rate is interface limited, while above it, it is diffusion limited. The stress for the roughening transition is obtained from a model that describes the transition in terms of a barrier for the nucleation of interface dislocations. The barrier is shown to depend on the change of the interface energy with misorientation. It is estimated that d γ /d θ = 1 mJ m −2 /degree can give rise to a threshold stress of 10 MPa." @default.
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- W2040961750 date "1991-11-01" @default.
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- W2040961750 title "Interface effects in superplastic deformation of alumina containing zirconia, titania or hafnia as a second phase" @default.
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- W2040961750 doi "https://doi.org/10.1016/0956-7151(91)90107-c" @default.
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