Large strain deformation studies using polycrystalline magnesium as a rock analogue. Part II: dynamic recrystallisation mechanisms at high temperatures

Details Large strain deformation studies using polycrystalline magnesium as a rock analogue. Part II: dynamic recrystallisation mechanisms at high temperatures Large strain deformation studies using polycrystalline magnesium as a rock analogue. Part II: dynamic recrystallisation mechanisms at high temperatures

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...40..208d&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 40, Issue 3, p. 208-222.

Physics

32

Scientific paper

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.

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