Zur Theorie der Rekristallisation

Alterthum, H.

doi:10.1002/bbpc.19220281504

Cited by 4 publications

(1 citation statement)

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“…Part of the annealing process in ice involves normal grain growth. Carpenter and Elam (1920) and Altherthum (1922) established the distinguishing factor between recrystallization and grain growth, stating that the driving force for recrystallization is provided by stored energy and that for grain growth is provided by grain boundary energy (Humphreys & Hatherly, 2004). If deformation is continued to larger strains, it is still unclear whether there is a transition or a balance between recrystallization and normal grain growth.…”

Section: Discussionmentioning

confidence: 99%

The Onset of Recrystallization in Polar Firn

Ogunmolasuyi,

Murdza,

Baker

2023

Geophysical Research Letters

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Constraining the onset of dynamic recrystallization (DRX) and its effects on the mechanical properties of firn is crucial for firn densification modeling. To that end, samples from a depth of 13 m in a Summit, Greenland (72°35′N, 38°25′W) firn core were subjected to creep tests at −14°C and 0.21 MPa compressive stress to strains of 7%, 12%, 18%, and 29%. Microstructural analyses using thin‐section imaging and microcomputed x‐ray tomography (micro‐CT) revealed smaller grain sizes, reduced specific surface area and connectivity, and increased density in relation to reduced porosity as the strain increases. These results show that DRX occurs in firn under creep, with strain‐induced boundary migration (SIBM) and nucleation and growth starting at ∼7%. DRX leads to elongated grains, reduced grain size, and the development of a preferred crystallographic orientation, indicating that DRX occurs by both SIBM and nucleation and growth.

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Section: Discussionmentioning

confidence: 99%