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- W1979202704 abstract "The dynamic recrystallisation mechanisms in a magnesium alloy have been investigated during uniaxial large strain compression at T = 0.7−0.95 Tm (Tm = melting temperature). Previous work at T = 0.45−0.64 Tm has shown that the metal is a useful analogue for minerals with a high plastic anisotropy. The high strain microstructures were akin to those in high grade tectonites. Initial grain sizes and shapes had been completely transformed with the recrystallised grainsize related solely to the flow stress. Two processes were responsible for the transformation, grain boundary migration and the formation of new high angle boundaries by progressive misorientation across subgrain boundaries. Estimates of the grain boundary migration velocity suggest that solute-escape migration does not occur. This type of recrystallisation mechanism where grain boundary migration and subgrain rotation are equally involved has not previously been described. A ‘recrystallisation mechanism diagram’ has been produced to show the relationship of this mechanism, to other recrystallisation mechanisms. In the diagram a particular mechanism is defined in terms of the relative contribution of the following processes; subgrain rotation, subgrain growth, grain boundary bulging and grain growth. Consideration of normalised experimentally defined stress grain size relationships reveals that there is a systematic relationship between the normalised stress grain size relationship and the type of recrystallisation mechanism, as defined by the ‘mechanism diagram’. The implications of these results to the interpretation of upper mantle olivine palaeoblast grain size profiles (Ave Lallement et al.) are discussed." @default.
- W1979202704 created "2016-06-24" @default.
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- W1979202704 date "1985-11-01" @default.
- W1979202704 modified "2023-10-03" @default.
- W1979202704 title "Large strain deformation studies using polycrystalline magnesium as a rock analogue. Part II: dynamic recrystallisation mechanisms at high temperatures" @default.
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- W1979202704 doi "https://doi.org/10.1016/0031-9201(85)90131-1" @default.
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