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- W2093530651 abstract "In the present work the steady state creep of pure and commercial aluminium was studied at different working temperatures in the range 340–475 °C under a constant stress of 1.86 kgf mm−2. Superplasticity was detected at 410 °C and 390 °C for pure aluminium and commercial aluminium respectively. The effect of the grain diameter on superplasticity was investigated using commercial aluminium which showed higher peak values of strain rates than those of pure aluminium. It was found that polycrystalline samples with initially small grains were required to initiate superplasticity. The structural study of commercial aluminium revealed that superplastic behaviour was associated with decreases in the initial grain diameter and in the initial lattice parameter. For pure aluminium the activation energy 37 ± 1 kcal mol−1 and the strain rate sensitivity m = 0.5 characterizing the superplastic process were controlled by dislocation climb. The presence of impurities enhanced such a mechanism and the impurities acted as spherical centres facilitating grain boundary sliding through dislocation climb at these boundaries." @default.
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- W2093530651 date "1981-01-01" @default.
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- W2093530651 title "Grain boundary sliding as the origin of superplasticity in commercially pure aluminium" @default.
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- W2093530651 doi "https://doi.org/10.1016/0025-5416(81)90036-7" @default.
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